MTU 12V2000M93 User manual

Operating Instructions
Diesel engine
12V2000M93
16V2000M93
M015655/05E

Engine model kW/cyl. Application group
12V2000M93 111.7 kW/cyl. 1DS, continuous operation, variable, low load
factors
16V2000M93 111.9 kW/cyl. 1DS, continuous operation, variable, low load
factors
Table 1: Applicability
© 2015 Copyright MTU Friedrichshafen GmbH
This publication is protected by copyright and may not be used in any way, whether in whole or in part, without the prior
written consent of MTU Friedrichshafen GmbH. This particularly applies to its reproduction, distribution, editing, transla-
tion, microfilming and storage or processing in electronic systems including databases and online services.
All information in this publication was the latest information available at the time of going to print. MTU Friedrichshafen
GmbH reserves the right to change, delete or supplement the information provided as and when required.

Table of Contents
1 Safety
1.1 Important provisions for all products 5
1.2 Personnel and organizational requirements 7
1.3 Transport 8
1.4 Safety regulations for startup and operation 10
1.5 Safety regulations for maintenance and
repair work 12
1.6 Fire prevention and environmental
protection, fluids and lubricants, auxiliary
materials 15
1.7 Standards for safety notices in the text 17
2 General Information
2.1 Tightening specifications for screws, nuts
and bolts 18
2.2 Engine side and cylinder designations 31
2.3 Product description 32
2.4 Engine – Overview 38
2.5 Sensors and actuators – Overview 40
3 Technical Data
3.1 Engine data 12V2000M93 45
3.2 Engine data 16V2000M93 48
3.3 Firing order 51
3.4 Engine – Main dimensions 52
4 Operation
4.1 Putting the engine into operation after
extended out-of-service periods (>3 months) 53
4.2 Engine – Putting into operation after
scheduled out-of-service-period 54
4.3 Tasks after extended out-of-service periods
(>3 weeks) 55
4.4 Checks prior to start-up 56
4.5 Fuel treatment system – Putting into
operation 57
4.6 Operational checks 59
4.7 Fuel treatment system – Switching on 60
4.8 Starting the engine 61
4.9 Engine – Shutdown 62
4.10 Emergency engine stop 63
4.11 After stopping the engine 64
4.12 Fuel treatment system – Shutdown 65
4.13 Plant – Cleaning 66
5 Maintenance
5.1 Maintenance task reference table [QL1] 67
6 Troubleshooting
6.1 Fuel treatment system – Troubleshooting 68
6.2 Troubleshooting 69
7 Task Description
7.1 SOLAS 72
7.1.1 SOLAS shielding as per MTN 5233 –
Installation 72
7.1.2 SOLAS shielding – Installation 73
7.1.3 Installation locations for SOLAS shielding 74
7.2 Engine 79
7.2.1 Engine – Barring manually 79
7.2.2 Engine – Cranking on starting system 80
7.3 Cylinder Liner 81
7.3.1 Cylinder liner – Endoscopic examination 81
7.3.2 Instructions and comments on endoscopic and
visual examination of cylinder liners 83
7.4 Crankcase Breather 85
7.4.1 Crankcase breather – Cleaning oil pre-
separator element 85
7.4.2 Crankcase breather – Oil separator
replacement, diaphragm check and
replacement 86
7.5 Valve Drive 88
7.5.1 Valve clearance – Check and adjustment 88
7.5.2 Cylinder head cover – Removal and
installation 91
7.6 Injection Valve / Injector 92
7.6.1 Injector – Replacement 92
7.6.2 Injector – Removal and installation 93
7.7 Fuel System 95
7.7.1 Fuel system – Venting 95
7.8 Fuel Filter 96
7.8.1 Fuel filter – Replacement 96
7.8.2 Fuel prefilter – Differential pressure check
and adjustment of gauge 98
7.8.3 Fuel prefilter – Draining 99
7.8.4 Fuel prefilter – Flushing 101
7.8.5 Fuel prefilter – Filter element replacement 103
7.9 Charge-Air Cooling 105
7.9.1 Intercooler – Checking condensate drain line
for coolant discharge and obstruction 105
7.10 Air Filter 106
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7.10.1 Air filter – Replacement 106
7.10.2 Air filter – Removal and installation 107
7.11 Air Intake 108
7.11.1 Service indicator – Signal ring position check 108
7.12 Starting Equipment 109
7.12.1 Starter – Condition check 109
7.13 Lube Oil System, Lube Oil Circuit 110
7.13.1 Engine oil – Level check 110
7.13.2 Engine oil – Change 111
7.14 Oil Filtration / Cooling 112
7.14.1 Engine oil filter – Replacement 112
7.14.2 Centrifugal oil filter – Cleaning and filter-
sleeve replacement 114
7.15 Coolant Circuit, General, High-Temperature
Circuit 116
7.15.1 Drain and venting points 116
7.15.2 Engine coolant – Level check 121
7.15.3 Engine coolant – Change 122
7.15.4 Engine coolant – Draining 123
7.15.5 Engine coolant – Filling 124
7.15.6 HT coolant pump – Relief bore check 125
7.15.7 Engine coolant – Sample extraction and
analysis 126
7.15.8 Coolant filter – Replacement 127
7.16 Raw Water Pump with Connections 128
7.16.1 Raw water pump – Relief bore check 128
7.17 Belt Drive 129
7.17.1 Drive belt – Condition check 129
7.18 Battery-Charging Generator 130
7.18.1 Battery-charging generator drive – Drive belt
replacement 130
7.19 Fuel Supply System 131
7.19.1 Water drain valve – Check 131
7.19.2 Differential pressure gauge – Check 132
7.19.3 Water level probe (3-in-1 rod electrode) –
Check 133
7.19.4 Pump capacity – Check 134
7.19.5 Coalescer filter element – Replacement 135
7.20 Wiring (General) for Engine/Gearbox/Unit 137
7.20.1 Engine cabling – Check 137
7.21 Accessories for (Electronic) Engine
Governor / Control System 138
7.21.1 Engine governor and connector – Cleaning 138
7.21.2 EMU and connectors – Cleaning 139
7.21.3 Engine governor plug connections – Check 140
7.21.4 Engine Monitoring Unit EMU 7 – Plug
connection check 141
7.21.5 Interface module EIM plug connections –
Check 142
7.21.6 Engine Control Unit – Self-test 143
7.21.7 Engine Control Unit ECU 7 – Removal and
installation 144
7.21.8 Engine Monitoring Unit – Removal and
installation 145
7.21.9 Engine Interface Module EIM – Removal and
installation 146
7.21.10 Diagnostic features on EIM 147
8 Appendix A
8.1 Abbreviations 150
8.2 MTU contact persons/service partners 152
9 Appendix B
9.1 Special Tools 153
9.2 Index 161
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1 Safety
1.1 Important provisions for all products
Nameplate
The product is identified by nameplate, model designation or serial number and must match with the
information on the title page of this manual.
Nameplate, model designation or serial number can be found on the product.
All EU-certified engines delivered by MTU come with a second nameplate. When operating the machine
in the EU: The second nameplate must be affixed in a prominent position as described in the accompa-
nying specifications.
General information
This product may pose a risk of injury or damage in the following cases:
• Incorrect use
• Operation, maintenance and repair by unqualified personnel
• Modifications or conversions
• Noncompliance with the safety instructions and warning notices
Correct use
The product is intended for use in accordance with its contractually-defined purpose as described in the
relevant technical documents only.
Intended use entails operation:
• Within the permissible operating parameters in accordance with the (→ Technical data)
• With fluids and lubricants approved by the manufacturer in accordance with the (→ Fluids and Lubri-
cants Specifications of the manufacturer)
• With spare parts approved by the manufacturer in accordance with the (→ Spare Parts Catalog/MTU
contact/Service partner)
• In the original as-delivered configuration or in a configuration approved by the manufacturer in writ-
ing (including engine control/parameters)
• In compliance with all safety regulations and in adherence with all warning notices in this manual
• With maintenance work performed in accordance with the (→ Maintenance Schedule) throughout the
useful life of the product
• In compliance with the maintenance and repair instructions contained in this manual, in particular
with regard to the specified tightening torques
• With the exclusive use of technical personnel trained in commissioning, operation, maintenance and
repair
• By contracting only workshops authorized by the manufacturer to carry out repair and overhaul
Any other use is considered improper use. Such improper use increases the risk of injury and damage
when working with the product. The manufacturer shall not be held liable for any damage resulting from
improper, non-intended use.
Modifications or conversions
Unauthorized changes to the product represent a contravention of its intended use and compromise
safety.
Changes or modifications shall only be considered to comply with the intended use when expressly au-
thorized by the manufacturer. The manufacturer shall not be held liable for any damage resulting from
unauthorized changes or modifications.
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Emission regulations and emission labels
Responsibility for compliance with emission regulations
Modification or removal of any mechanical/electronic components or the installation of additional com-
ponents including the execution of calibration processes that might affect the emission characteristics
of the product are prohibited by emission regulations. Emission control units/systems may only be
maintained, exchanged or repaired if the components used for this purpose are approved by the manu-
facturer.
Noncompliance with these regulations will invalidate the design type approval issued by the emissions
regulation authorities. The manufacturer does not accept any liability for violations of the emission reg-
ulations. The maintenance schedules of the manufacturer must be observed over the entire life cycle of
the product.
Replacing components with emission labels
Emission labels are attached to all MTU engines. These must remain on the engine throughout its op-
erational life.
Engines used exclusively in land-based, military applications other than by US government agencies are
excepted from this proviso.
Please note the following when replacing components with emission labels:
• Appropriate emission labels must be affixed on spare parts.
• Emission labels may not be transferred from old components to new ones.
• Emission labels on old components must be removed and destroyed.
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1.2 Personnel and organizational requirements
Organizational measures of the user/manufacturer
This manual must be issued to all personnel involved in operation, maintenance, repair or transporta-
tion.
Keep this manual handy in the vicinity of the product such that it is accessible to operating, mainte-
nance, repair and transport personnel at all times.
Personnel must receive instruction on product handling and maintenance on the basis of this manual
with a special emphasis on safety requirements and warnings.
This is particularly important in the case of personnel who only occasionally perform work on or around
the product. This personnel must be instructed repeatedly.
Personnel requirements
All work on the product shall be carried out by trained and qualified personnel only:
• Training at the Training Center of the manufacturer
• Technical personnel from the areas mechanical engineering, plant construction and electrical engi-
neering
The operator must define the responsibilities of the personnel involved in operation, maintenance, re-
pair and transport.
Personnel must not be under the influence of alcohol, drugs or strong medication.
Work clothing and personal protective equipment
When working, always wear the necessary personal protective equipment (e.g. safety shoes, ear protec-
tors, protective gloves, goggles, breathing protection). Observe the information on personal protective
equipment in the respective activity description.
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1.3 Transport
Transport without flange-mounted gearbox
A max. permissible diagonal
pull 70°
B max. permissible diagonal
pull 35°
Illustration is also valid for 12V/16V2000Mxx engines
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Transport with flange-mounted gearbox
Illustration is also valid for 12V/16V2000Mxx engines
Only use the lifting eyes provided to lift the engine.
The eyebolts mounted at the driving end and on the gearbox must not be used for transporting plants
with flange-mounted gearboxes.
Only use transport and lifting devices approved by MTU.
Take the engine's center of gravity into account.
The engine must only be transported in installation position, max. permissible diagonal pull with flange-
mounted gearbox is 10°.
If the engine is supplied with special aluminum foil packing, lift the engine at the lifting eyes of the bear-
ing pedestal or use a means of transportation which is appropriate for the given weight (forklift truck).
Install the crankshaft locking device and the locking screws for the engine mounts prior to engine trans-
portation.
Secure the engine against tilting during transport. In particular when going down inclines or ramps, the
engine must be secured against moving and tilting.
Setting down the engine following transportation
Only set down engine on a firm, level surface.
Make sure that the consistency and load-bearing capacity of the ground or support surface is adequate.
Never set down engines onto the oil pan unless expressly permitted by MTU on an engine-specific base.
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1.4 Safety regulations for startup and operation
Safety regulations for startup
Install the product correctly and carry out acceptance in accordance with the manufacturer's specifica-
tions before putting the product into service. All necessary approvals must be granted by the relevant
authorities and all requirements for initial startup must be fulfilled.
When putting the product into operation, always ensure that
• All personnel is clear of the danger zone surrounding moving parts of the machine.
Electrically-actuated linkages may be set in motion when the Engine Control Unit (governor) is
switched on.
• All maintenance and repair work has been completed.
• All loose parts have been removed from rotating machine components.
• All safety equipment is in place.
• No persons wearing pacemakers or any other technical body aids are present.
• The service room is adequately ventilated.
• Keep clear of the service room during the first operating hours. Hazardous gases may occur as a re-
sult of the combustion of paints or oils.
• The exhaust system is leak-tight and that the gases are vented to atmosphere.
• Protect battery terminals, generator terminals or cables against accidental contact.
• Check that all connections have been correctly allocated (e.g. +/- polarity, direction).
Immediately after putting the product into operation, make sure that all control and display instruments
as well as the monitoring, signaling and alarm systems are working properly.
Smoking is prohibited in the area of the product.
Safety regulations during operation
The operator must be familiar with the controls and displays.
The operator must be familiar with the consequences of any operations performed.
During operation, the display instruments and monitoring units must be permanently observed with re-
gard to present operating status, violation of limit values and warning or alarm messages.
Malfunctions and emergency stop
The procedures for emergencies, in particular, emergency stop, must be practiced regularly.
The following steps must be taken if a malfunction of the system is detected or reported by the system:
• Inform supervisor(s) in charge.
• Analyze the message.
• Respond to the emergency appropriately, e.g. execute an emergency stop.
Operation
Do not remain in the operating room when the product is running for any longer than absolutely neces-
sary.
Keep a safe distance away from the product if possible. Do not touch the product unless expressly in-
structed to do so following a written procedure.
Do not inhale the exhaust gases of the product.
The following requirements must be fulfilled before the product is started:
• Wear ear protectors.
• Mop up any leaked or spilled fluids and lubricants immediately or soak up with a suitable binder
agent.
Operation of electrical equipment
During operation of electrical devices, certain elements of these devices are live/under high voltage.
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Observe the warning information applicable to the devices.
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1.5 Safety regulations for maintenance and repair work
Safety regulations prior to maintenance and repair work
Have maintenance or repair work carried out by qualified and authorized personnel only.
Allow the product to cool down to less than 50 °C (risk of explosion for oil vapors, fluids and lubricants,
risk of burning).
Relieve pressure in fluid and lubricant systems and compressed-air lines which are to be opened. Use
suitable collecting vessels of adequate capacity to catch fluids and lubricants.
When changing the oil or working on the fuel system, ensure that the service room is adequately venti-
lated.
Never carry out maintenance and repair work with the product in operation, unless:
• It is expressly permitted to do so following a written procedure.
• The product is running in the low load range and only for as long as absolutely necessary.
Lock-out the product to preclude undesired starting, e.g.
• Start interlock
• Key switch
• With hydraulic starting system: shut off supply line.
Attach “Do not operate” sign in the operating area or to control equipment.
Disconnect the battery. Lock out circuit breakers.
Close the main valve on the compressed-air system and vent the compressed-air line when pneumatic
starters are fitted.
Disconnect the control equipment from the product.
Use special tools if they are specified for the relevant work.
Elastomer components (e.g. engine mounts, damping elements, couplings and V-belts) must not be
painted. They may only be installed after painting the engine or must be covered before painting work is
carried out.
The following applies to starters with copper-beryllium alloy pinions:
• Wear a respirator mask (filter class P3). Do not blow out the interior of the flywheel housing or the
starter with compressed air. Clean the flywheel housing inside with a class H dust extraction device.
• Observe the safety data sheet.
Safety regulations during maintenance and repair work
Take special care when removing ventilation or plug screws from the product. Cover the screw or plug
with a rag to prevent fluids escaping under pressure.
Take care when draining hot fluids and lubricants (risk of burning).
Use only proper and calibrated tools. Observe the specified tightening torques during assembly or dis-
assembly.
Carry out work only on assemblies or plants which are properly secured.
Make sure components or assemblies are placed on stable surfaces. Adopt suitable measures to avoid
that components/tools fall down . Use the specified lifting equipment for all components.
Never use the product as a climbing aid.
When working high on the equipment, always use suitable ladders and work platforms. Never work on
engines or components that are held in place by lifting equipment.
Keep fuel injection lines and connections clean.
Carry out appropriate cleaning procedures to clean and inspect components requiring special cleanness
(e.g. components carrying oil, fuel, or air).
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Always seal connections with caps or covers if a line is removed or opened.
Fit new seals when re-installing lines.
Never bend lines and avoid damaging lines, particularly the fuel lines.
Ensure that all retainers and dampers are installed correctly.
Ensure that O-rings are not installed ina slanted/twisted condition.
Ensure that all fuel injection and pressurized oil lines are installed with enough clearance to prevent
contact with other components. Do not place fuel or oil lines near hot components.
Do not touch elastomeric seals (e.g. Viton sealing rings) with your bare hands if they have a carbonized
or resinous appearance.
Note cooling time for components which are heated for installation or removal (risk of burning).
Pay particular attention to cleanliness at all times.
Remove any condensate from components which were chilled before assembly. If necessary, coat the
components with a suitable corrosion inhibitor.
Safety regulations following maintenance and repair work
Before barring, make sure that nobody is standing in the danger zone of the product.
Check that all access ports/apertures which have been opened to facilitate working are closed again.
Check that all safety equipment has been installed and that all tools and loose parts have been re-
moved (especially the barring gear).
Ensure that no unattached parts have been left in/on the product (e.g. including rags and cable straps).
Welding work
Welding operations on the product or mounted units are not permitted. Cover the product when welding
in its vicinity.
Before starting welding work:
• Switch off the power supply master switch.
• Disconnect the battery.
• Separate the electrical ground of electronic equipment from the ground of the unit.
No other maintenance or repair work must be carried out in the vicinity of the product while welding is
going on. Risk of explosion or fire due to oil vapors and highly flammable process materials.
Do not use product as ground terminal.
Never position the welding power supply cable adjacent to, or crossing wiring harnesses of the product.
The welding current may otherwise induce an interference voltage in the wiring harnesses which could
conceivably damage the electrical system.
Remove components (e.g. exhaust pipe) from the product before performing necessary welding work .
Hydraulic installation and removal
Check satisfactory function and safe operating condition of tools, jigs and fixtures to be used. Use only
the specified jigs and fixtures for hydraulic removal/installation procedures.
Observe the max. permissible force-on pressure specified for the jig/fixture.
Do not attempt to bend or exert force on HP lines.
Before starting work, pay attention to the following:
• Vent the installation/removal device, the pumps and the pipework at the relevant designated points.
• During the installation procedure, screw on device with plunger extended.
• During the removal procedure, screw on device with plunger retracted.
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For a hydraulic installation/removal device with central expansion pressure supply, screw spindle into
shaft end until correct sealing is established.
During hydraulic installation/removal of components, ensure that no persons are in the direct vicinity of
the component being pressed on.
Working with batteries
Observe the safety instructions of the battery manufacturer when working with batteries.
Gases released from the battery are explosive. Avoid sparks and naked flames.
Do not allow electrolyte to come into contact with skin or clothing.
Wear protective clothing, goggles and protective gloves.
Do not place tools on the battery.
Before connecting the cable to the battery, check the battery polarity. Battery pole reversal may lead to
injury through the sudden discharge of acid or bursting of the battery body.
Working on electrical and electronic assemblies
Always obtain the permission of the person in charge before commencing maintenance and repair work
or switching off any part of the electronic system required to do so.
De-energize the appropriate areas prior to working on assemblies.
Do not damage cabling during removal work. When reconnecting, ensure that cabling cannot be dam-
aged during operation by:
• Contact with sharp edges
• Chafing on components
• Contact with hot surfaces.
Do not secure cables on lines carrying fluids.
Do not use cable straps to secure cables.
Always use connector pliers to tighten union nuts on connectors.
Subject the device as well as the product to a functional testing on completion of all repair work. In
particular, check the function of the engine emergency stop feature.
Store spare parts properly prior to replacement, i.e. protect them against moisture in particular. Pack-
age faulty electronic components or assemblies properly before dispatching for repair:
• Moisture-proof
• Shock-proof
• Wrapped in antistatic foil if necessary.
Working with laser devices
Laser work must only be performed by authorized and trained personnel. When working with laser
equipment, always observe the safety instructions in the manufacturer's Operating Instructions.
When working with laser equipment, always wear special laser-protection goggles (hazard due to heavi-
ly focused radiation).
Laser devices must be equipped with protective devices in accordance with their class and usage to
ensure safe operation.
Measuring deviations on components
At a reference temperature of 20 °C, workpieces, components and measuring instrument are within the
specified tolerances.
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1.6 Fire prevention and environmental protection, fluids and
lubricants, auxiliary materials
Fire prevention
Flames, naked light and smoking are prohibited.
When working with combustible indirect materials, e.g. cleaning agent, ensure area is well ventilated.
The resultant steam/air mixture must be sufficiently diluted to prevent a potentially explosive atmos-
phere.
Rectify any fuel or oil leaks immediately. Oil or fuel on hot components can cause fires – therefore al-
ways keep the product in a clean condition. Do not leave rags saturated with fluids and lubricants on
the product. Do not store combustible materials near the product.
Do not carry out welding work on pipes and components carrying oil or fuel. Before welding, clean with
a nonflammable fluid.
When starting the engine with an external power source, connect the ground cable last and remove it
first. To avoid sparks in the vicinity of the battery, connect the ground cable from the external power
source to the ground cable of the engine or to the ground terminal of the starter.
Always have a suitable extinguishant (fire extinguisher) on hand and familiarize yourself fully with its
handling.
Noise
Noise can lead to an increased risk of accidents if acoustic signals, warning shouts or sounds indicating
danger are drowned.
Wear ear protectors in workplaces with a sound pressure level in excess of 85 dB (A).
Environmental protection and disposal
Dispose of used fluids, lubricants and filters in accordance with local regulations.
Within the EU, batteries can be returned free of charge to the manufacturer where they will be properly
recycled.
Fluids and lubricants, auxiliary materials
The Fluids and Lubricants Specifications will be amended or supplemented as necessary. Prior to opera-
tion, make sure that the latest version is used. The latest version can be found on the website on the
“Technical Info” or “Parts and Service” tabs at http://www.mtu-online.com.
Process materials may also be hazardous or toxic. When using consumables and auxiliary materials as
well as other chemical substances, observe the information contained in the safety data sheet for the
product. The safety data sheet may be obtained from the relevant manufacturer or from MTU.
Take special care when using hot, chilled or caustic materials.
Used oil
Used oil contains combustion residues that are harmful to health.
Wear protective gloves!
Wash relevant areas after contact with used oil.
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Lead
• Adopt suitable measures to avoid the formation of lead dust.
• Switch on extraction system.
• When working with lead or pastes containing lead, avoid direct contact to the skin and do not inhale
lead vapors.
• Wash relevant areas after contact with lead or lead-containing substances.
Compressed air
Observe special safety precautions when working with compressed air:
• Unauthorized use of compressed air, e.g. forcing flammable liquids (hazard class AI, AII and B) out of
containers, risks causing an explosion.
• Wear goggles when blowing dirt off workpieces or blowing away swarf.
• Blowing compressed air into thin-walled containers (e.g. containers made of sheet metal, plastic or
glass) for drying purposes or to check for leaks risks bursting them.
• Pay special attention to the pressure in the compressed air system or pressure vessel.
• Assemblies or products which are to be connected must be designed to withstand this pressure. In-
stall pressure-reducing or safety valves set to the admissible pressure if this is not the case.
• Hose couplings and connections must be securely attached.
• Provide the snout of the air nozzle with a protective disk (e.g. rubber disk).
• First shut off compressed air lines before compressed air device is disconnected from the supply
line, or before device or tool is to be replaced.
• Carry out leak test in accordance with the specifications.
Painting
• Observe the relevant safety data sheet for all materials.
• When carrying out painting work outside the spray stands provided with fume extraction systems,
ensure that the area is well ventilated. Make sure that neighboring work areas are not adversely af-
fected.
• There must be no naked flames in the vicinity.
• No smoking.
• Observe fire-prevention regulations.
• Always wear a mask providing protection against paint and solvent vapors.
Liquid nitrogen
• Observe the relevant safety data sheet for all materials.
• Work with liquid nitrogen may be carried out only by qualified personnel.
• Store liquid nitrogen only in small quantities and always in specified containers without fixed covers.
• Avoid body contact (eyes, hands).
• Wear protective clothing, protective gloves, closed shoes and safety goggles.
• Make sure that working area is well ventilated.
• Avoid knocking or jolting the containers, valves and fittings or workpieces in any way.
Acids/alkaline solutions/urea (AdBlue®, DEF)
• Observe the relevant safety data sheet for all materials.
• When working with acids and alkaline solutions, wear goggles or face mask, gloves and protective
clothing.
• Do not inhale vapors.
• If urea solution is swallowed, rinse out mouth and drink plenty of water.
• Remove any wet clothing immediately.
• After contact skin, wash body areas with plenty of water.
• Rinse eyes immediately with eyedrops or clean tap water. Seek medical attention as soon as possi-
ble.
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1.7 Standards for safety notices in the text
DANGER In the event of immediate danger.
Consequences: Death, serious or permanent injury!
• Remedial action.
WARNING In the event of a situation involving potential danger.
Consequences: Death, serious or permanent injury!
• Remedial action.
CAUTION In the event of a situation involving potential danger.
Consequences: Minor or moderate injuries!
• Remedial action.
NOTICE In the event of a situation involving potentially adverse effects on the product.
Consequences: Material damage!
• Remedial action.
• Additional product information.
Safety notices
1. This manual with all safety instructions and safety notices must be issued to all personnel involved in
operation, maintenance, repair or transportation.
2. The higher level warning notice is used if several hazards apply at the same time. Warnings related to
personal injury shall be considered to include a warning of potential damage.
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2 General Information
2.1 Tightening specifications for screws, nuts and bolts
Tightening torques for setscrew and stud joints to MTN 5008 standard
This standard applies to setscrews not subject to dynamic loads and the associated nuts according to:
• MMN 384
• ISO 4762 (DIN 912)
• ISO 4014 (DIN 931-1)
• ISO 4017 (DIN 933)
• DIN EN ISO 8765 (EN 28765; DIN 960)
• DIN EN ISO 8676 (EN 28676; DIN 961)
• DIN 6912
This standard applies to studs not subject to dynamic loads and the associated nuts according to:
• DIN 833
• DIN 835
• DIN EN ISO 5395 (DIN 836)
• DIN 938
• DIN 939
This standard applies to screws with hexalobular heads according to:
• DIN 34800
• DIN 34801
The standard does not apply to heat-resistant screws in the hot component zone.
Tightening torques MA are specified for screws of strength class 8.8 (surface finish bare metal, phosph-
atized or galvanized) and 10.9 (surface finish bare metal or phosphatized).
The values in the table are based on a friction coefficient µtot = 0.125.
Threads and mating faces of screws and nuts must be coated with engine oil prior to assembly.
When hand-tightening (defined torque), an assembly tolerance of +10% of the figures in the table is per-
mitted.
When machine-tightening, the permissible assembly tolerance is ±15%.
Tightening torques for setscrews
Thread Hand-tightening Machine-tightening
8.8 MA (Nm) 10.9 MA (Nm) 8.8 MA (Nm) 10.9 MA (Nm)
M6 9 12 8 11
M8 21 31 20 28
M8 x 1 23 32 21 30
M10 42 60 40 57
M10 x 1.25 45 63 42 60
M12 74 100 70 92
M12 x 1.25 80 110 75 105
M12 x 1.5 76 105 72 100
M14 115 160 110 150
M14 x 1.5 125 180 120 170
M16 180 250 170 235
M16 x 1.5 190 270 180 255
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Thread Hand-tightening Machine-tightening
8.8 MA (Nm) 10.9 MA (Nm) 8.8 MA (Nm) 10.9 MA (Nm)
M18 250 350 240 330
M18 x 1.5 280 400 270 380
M20 350 500 330 475
M20 x 1.5 390 550 350 520
M22 480 680 450 650
M22 x 1.5 520 730 490 700
M24 600 850 570 810
M24 x 1.5 680 950 640 900
M24 x 2 660 900 620 850
M27 900 1250 850 1175
M27 x 2 960 1350 900 1275
M30 1200 1700 1100 1600
M30 x 2 1350 1900 1250 1800
MA= tightening torques
Tightening torques for studs
Thread
Screwed into
Steel M A
(Nm)
Gray cast iron MA
(Nm)
Al alloy MA
(Nm)
M6 9 6 6
M8 11 9 10
M10 17 13 13
M12 27 23 18
M14 37 33 33
M16 55 45 –
MA= tightening torques
Tightening torques for setscrews and nuts made of stainless steel
The values in the table are based on a friction coefficient µtot = 0.12, lubricated with Molykote on the
thread and under the screw head.
Basic size
Strength class
Material
70 80
M A
(Nm)
MA
(Nm)
M5 3.7 4.9 A2 / A4
M6 6.4 8.5 A2 / A4
M8 15,3 20,4 A2 / A4
M10 31 41 A2 / A4
M12 52 70 A2 / A4
M16 126 167 A2 / A4
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Basic size
Strength class
Material
70 80
M A
(Nm)
MA
(Nm)
M20 254 326 A2 / A4
MA= tightening torques
Tightening torque for self-locking hex nuts
Thread MA (Nm) Lubricant
M6 7,5 +1 –
M8 17 +2 –
M10 35 +4 –
M12 59 +6 –
M14 100 +10 –
M16 140 +14 –
M20 290 +29 –
MA= tightening torques
Tightening torques for stress bolt connections to MTN 5007 standard
This standard applies to stress pin bolts and stress bolts which are subjected to static and dynamic
load of strength class 10.9 as well as to the associated nuts.
Shank and junction dimensions to MMN 209 standard and material and manufacture to MMN 389
standard (bare metal or phosphatized).
The values in the table are based on a friction coefficient µtot = 0.125.
Threads and mating faces of screws and nuts must be coated with engine oil prior to assembly.
An assembly tolerance of +10% of the figures in the table is permitted due to unavoidable deviations
during the tightening process.
The figures in the table are for hand-tightening using a torque wrench.
Thread Not torsion-protected MA(Nm) Torsion-protected MA (Nm)
M6 9 12
M8 21 28
M8 x 1 24 30
M10 42 55
M10 x 1.25 46 60
M12 75 93
M12 x 1.5 78 99
M14 120 150
M14 x 1.5 135 160
M16 180 225
M16 x 1.5 200 245
M18 250 315
M18 x 1.5 300 360
M20 350 450
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