MTU 12 V 2000 M84 User manual

Operating Instructions
Diesel engine
12 V 2000 M84
16 V 2000 M84
MS150063/02E

Engine model kW/cyl. Application group
12V2000M84 101.7 kW/cyl. 1D, Continuous operation, variable, medium load
factors
16V2000M84 101.9 kW/cyl. 1D, Continuous operation, variable, medium load
factors
Table 1: Applicability
Printed in Germany
© 2014 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 manual 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 requirements for all products 5
1.2 Personnel and organizational requirements 6
1.3 Transport 7
1.4 Safety requirements for startup and
operation 9
1.5 Safety requirements for maintenance and
repair work 10
1.6 Fire prevention and environmental
protection, fluids and lubricants, auxiliary
materials 13
1.7 Standards for safety notices in the text 15
2 General Information
2.1 Tightening specifications for screws, nuts
and bolts 16
2.2 Engine side and cylinder designations 27
2.3 Product description 28
2.4 Engine layout 34
2.5 Sensors and actuators – Overview 36
3 Technical Data
3.1 12V 2000 M84 engine data 41
3.2 16V 2000 M84 engine data 44
3.3 Firing order 47
3.4 Engine – Main dimensions 48
4 Operation
4.1 Putting the engine into operation after
extended out-of-service periods (>3 months) 49
4.2 Engine – Putting into operation after
scheduled out-of-service-period 50
4.3 Tasks after extended out-of-service periods
(>3 weeks) 51
4.4 Checks prior to start-up 52
4.5 Fuel treatment system – Putting into
operation 53
4.6 Operational checks 55
4.7 Fuel treatment system – Switching on 56
4.8 Starting the engine 57
4.9 Engine – Shutdown 58
4.10 Emergency engine stop 59
4.11 After stopping the engine 60
4.12 Fuel treatment system – Shutdown 61
4.13 Plant – Cleaning 62
5 Maintenance
5.1 Maintenance task reference table [QL1] 63
6 Troubleshooting
6.1 Fuel treatment system – Troubleshooting 64
6.2 Troubleshooting 65
7 Task Description
7.1 SOLAS 68
7.1.1 SOLAS shielding as per MTN 5233 –
Installation 68
7.1.2 SOLAS shielding – Installation 69
7.1.3 Installation locations for SOLAS shielding 70
7.2 Engine 75
7.2.1 Engine – Barring manually 75
7.2.2 Engine – Cranking on starting system 76
7.3 Cylinder Liner 77
7.3.1 Cylinder liner – Endoscopic examination 77
7.3.2 Instructions and comments on endoscopic and
visual examination of cylinder liners 79
7.4 Crankcase Breather 81
7.4.1 Crankcase breather – Cleaning oil pre-
separator element 81
7.4.2 Crankcase breather – Oil separator element
replacement, diaphragm check and
replacement 82
7.5 Valve Drive 84
7.5.1 Valve clearance – Check and adjustment 84
7.5.2 Cylinder head cover – Removal and
installation 86
7.6 Injection Valve / Injector 87
7.6.1 Injector – Replacement 87
7.6.2 Injector – Removal and installation 88
7.7 Fuel System 90
7.7.1 Fuel system – Venting 90
7.8 Fuel Filter 91
7.8.1 Fuel filter – Replacement 91
7.8.2 Fuel prefilter – Differential pressure check
and adjustment of gauge 93
7.8.3 Fuel prefilter – Draining 94
7.8.4 Fuel prefilter – Flushing 96
7.8.5 Fuel prefilter – Filter element replacement 98
7.9 Charge-Air Cooling 100
7.9.1 Intercooler – Checking condensate drain line
for coolant discharge and obstruction 100
7.10 Air Filter 101
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7.10.1 Air filter – Replacement 101
7.10.2 Air filter – Removal and installation 102
7.11 Air Intake 103
7.11.1 Service indicator – Signal ring position check
(optional) 103
7.12 Starting Equipment 104
7.12.1 Starter – Condition check 104
7.13 Lube Oil System, Lube Oil Circuit 105
7.13.1 Engine oil – Level check 105
7.13.2 Engine oil – Change 106
7.14 Oil Filtration / Cooling 107
7.14.1 Engine oil filter – Replacement 107
7.14.2 Centrifugal oil filter and filter sleeve –
Cleaning and replacement 109
7.15 Coolant Circuit, General, High-Temperature
Circuit 112
7.15.1 Drain and venting points 112
7.15.2 Engine coolant – Level check 117
7.15.3 Engine coolant – Change 118
7.15.4 Engine coolant – Draining 119
7.15.5 Engine coolant – Filling 120
7.15.6 HT coolant pump – Relief bore check 121
7.15.7 Engine coolant – Sample extraction and
analysis 122
7.15.8 Coolant filter – Replacement 123
7.16 Raw Water Pump with Connections 124
7.16.1 Raw water pump – Relief bore check 124
7.17 Belt Drive 125
7.17.1 Drive belt – Condition check 125
7.18 Battery-Charging Generator 126
7.18.1 Battery-charging generator drive – Drive belt
replacement 126
7.19 Fuel Supply System 127
7.19.1 Water drain valve – Check 127
7.19.2 Differential pressure gauge – Check 128
7.19.3 Water level probe (3-in-1 rod electrode) –
Check 129
7.19.4 Pump capacity – Check 130
7.19.5 Coalescer filter element – Replacement 131
7.20 Wiring (General) for Engine/Gearbox/Unit 133
7.20.1 Engine wiring – Check 133
7.21 Accessories for (Electronic) Engine
Governor / Control System 134
7.21.1 Engine governor and connectors – Cleaning 134
7.21.2 EMU and connectors – Cleaning 135
7.21.3 Engine governor plug connections – Check 136
7.21.4 Engine Monitoring Unit EMU 7 – Plug
connection check 137
7.21.5 Interface module EIM plug connections –
Check 138
7.21.6 Engine Control Unit – Self-test 139
7.21.7 Engine Control Unit ECU 7 – Removal and
installation 140
7.21.8 Engine Monitoring Unit – Removal and
installation 141
7.21.9 Engine Interface Module EIM – Removal and
installation 142
7.21.10 Diagnostic features of EIM 143
8 Appendix A
8.1 Abbreviations 146
8.2 MTU contact persons/service partners 148
9 Appendix B
9.1 Special Tools 149
9.2 Index 156
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1 Safety
1.1 Important requirements for all products
Nameplate
The product is identified by a nameplate, model designation or serial number which must match the
information on the title page of this manual.
Nameplate, model designation or serial number can be found on the product.
General information
This product may pose a risk of injury or damage in the following cases:
• Improper use
• Operation, maintenance and repair by unqualified personnel
• Changes or modifications
• Noncompliance with the safety instructions and warning notices
Intended 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 management/parameters)
• In compliance with all safety regulations and in accordance 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 shall be considered non-intended. 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 re-
sulting from improper, non-intended use.
Changes or modifications
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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1.2 Personnel and organizational requirements
Organizational measures of the operator
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.
Use this manual as a basis for instructing personnel on product operation and repair, whereby the safe-
ty-relevant instructions, in particular, must be read and understood.
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
• Qualified personnel specialized in mechanical and plant engineering
The operator must define the responsibilities of the personnel involved in operation, maintenance, re-
pair and transport.
Working clothes and personal protective equipment
Wear proper protective clothing for all work.
When working, always wear the necessary personal protective equipment (e.g. ear protectors, protec-
tive 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 valid for 12/16V 2000 M engines
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Transport with flange-mounted gearbox
Illustration is valid for 12/16V 2000 M engines
Lift the engine only with the lifting eyes provided.
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 the engine down after transport
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 an engine down on the oil pan unless expressively authorized to do so by MTU on a case-to-
case basis.
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1.4 Safety requirements for startup and operation
Safety requirements for startup
The product must be installed and accepted in accordance with manufacturers' specifications prior to
initial startup.
All the requisite regulatory approvals must have been granted and all startup requirements fulfilled prior
to initial startup.
Whenever the product is started, always ensure that:
• All maintenance and repair work has been completed.
• All loose parts have been removed from rotating machine components.
• Wearers of cardiac pacemakers or other active medical implants are well clear.
• The operating room is adequately ventilated.
• Exhaust pipework is leak-tight and routed to atmosphere.
• Battery terminals, generator terminals and cables are guarded to preclude accidental contact.
• All personnel is clear of the danger zone represented by moving parts.
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.
Safety requirements for operation
The operator must be familiar with the controls and displays.
The operator must be aware of the consequences of any operations he/she performs.
During operation, the display instruments and monitoring units must be constantly observed in regard
of present operating status, limit value violation and warning or alarm messages.
Malfunctions and emergency stop
Emergency procedures, in particular emergency stop, must be practiced on a regular basis.
Take the following steps if a system malfunction is detected or signaled by the system:
• Inform the duty supervisor(s).
• Evaluate the message.
• Respond to the emergency appropriately, e.g. execute an emergency stop.
Operation
Do not stay in the operating room when the product is running unless absolutely necessary and then as
briefly as possible.
Keep a safe distance away from the product whenever possible. Do not touch the product unless ex-
pressly instructed to do so.
Do not inhale exhaust gases emitted by the product.
Ensure that the following requirements have been fulfilled before starting the product:
• Ear protectors are worn.
• Mop up any leaked or spilled fluids and lubricants immediately or soak up with a suitable binding
agent.
Operation of electrical equipment
Some components are live (high voltage) when electrical equipment is in operation.
Observe the safety instructions for these appliances.
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1.5 Safety requirements for maintenance and repair work
Safety requirements before commencing 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 collection vessels with a sufficient filling volume.
Ensure that the operating room is adequately ventilated when changing the oil or working on the fuel
system.
Do not perform maintenance or repair work when the product is running unless:
• expressly instructed to do so.
• the product is running in the low load range and only for as long as necessary to complete the task.
Lock-out the product to preclude undesired starting, e.g. start interlock.
Tag-out the product with a “Do Not Start” sign in the operation room or on the control facility.
Disconnect the battery. Lock the contactor.
Close the main valve on the compressed-air system and vent the compressed-air line when pneumatic
starters are fitted.
Disconnect the control facility from the product.
For starters with pinions made of copper-beryllium alloy:
• 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 interior of the flywheel housing with a class H dust extractor.
• Observe the safety data sheet.
Safety requirements during maintenance and repair work
Take special care when removing vent plugs or plug screws from the product. Hold a cloth over the
screw or plug to prevent discharge of highly pressurized liquids.
Take care when draining hot fluids and lubricants (risk of burning).
Use suitable and calibrated tools only. Observe the specified tightening torques during assembly or dis-
assembly.
Carry out work only on assembles and/or installations which are properly secured.
Never climb up on the lines.
Keep fuel injection lines and connections clean.
Always seal connections with caps or covers if a line is removed or opened.
Fit new seals when re-installing lines.
Avoid damaging lines, particularly the fuel lines.
Ensure that all retainers and dampers are installed correctly.
Ensure that all fuel injection and pressurized oil lines are installed with enough clearance to prevent
contact with other components. Never route fuel or oil lines in the vicinity of hot components.
Do not touch elastomeric seals (e.g. Viton sealing rings) with your bare hands if they have a carbonized
or resinous appearance.
Observe the cooling time for components which have been heated for installation or removal (risk of
burning!).
Always use suitable ladders and work platforms when working above head-height. Ensure that compo-
nents or assemblies are placed on stable surfaces.
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Pay particular attention to cleanliness at all times.
Safety requirements after completing maintenance and repair work
Ensure that all personnel is clear of danger zones before cranking.
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
Do not perform welding on the product or its attachments. Cover the product when performing welding
work in the vicinity.
Before commencing welding work:
• Switch off the master power supply switch.
• Disconnect the battery.
• Disconnect electronic and genset grounds.
Do not perform maintenance or repair work on the product when welding is in progress in its vicinity.
Risk of explosion or fire due to oil vapors and highly flammable process materials.
Do not use the product as a grounding terminal.
Do not route the welding cable over or near the 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 function and satisfactory condition of the jigs and fixtures to be used. Use only the specified jigs
and fixtures for hydraulic removal/installation.
Observe the max. permissible force-on pressure specified for the installation/removal jig.
Do not attempt to bend or exert force on HP lines.
Before starting work, pay attention to the following:
• Vent the installation/removal jig, the pumps and the pipework at the relevant designated points.
• For hydraulic installation, screw on the jig with the piston retracted.
• For hydraulic removal, screw on the jig with the piston extended.
For hydraulic installation/removal jigs with central expansion pressure supply, screw the spindle into
the shaft end until correct sealing has been established.
During hydraulic installation and removal, ensure that nobody is standing in the immediate vicinity of
the component to be installed/removed.
Working with batteries
Observe the safety requirements of the battery manufacturer when working with batteries.
Gases released from the battery are explosive. Avoid sparks and naked flames.
Do not allow electrolyte (battery acid) to come into contact with skin or clothing.
Wear goggles and protective gloves.
Do not place tools on the battery.
Check polarity before connecting the cable to the battery. Battery polarity reversal may lead to injury by
the sudden discharge of acid or bursting of the battery unit.
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Working on electrical/electronic assemblies
Always obtain the permission of the duty supervisor before commencing maintenance or 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.
Avoid damaging cabling during removal. When reconnecting, ensure that cabling cannot be damaged
during operation by:
• Contact with sharp edges
• Chafing on components
• Contact with hot surfaces.
Do not secure cabling to lines bearing fluids.
Do not use cable ties to secure cabling.
Always use connector pliers to tighten union nuts on connectors.
Subject the device and also the product to appropriate function testing whenever repair work has been
completed. In particular, check the function of the 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 equipment
Always wear special laser-protection goggles when working with laser equipment (danger due to in-
tensely focused radiation).
Laser equipment must be fitted with the protective devices necessary for safe operation according to
type and application.
For conducting light-beam procedures and measurement work, only the following laser devices must be
used:
• Laser devices of classes 1, 2 or 3A.
• Laser devices of class 3B, which have maximum output in the visible wavelength range (400 nm to
700 nm), a maximum output of 5 mW, and in which the beam axis and surface are designed to pre-
vent any risk to the eyes.
Measuring component deviations
Workpieces, components and measuring instruments are within specified tolerances at a reference
temperature of 20°C.
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1.6 Fire prevention and environmental protection, fluids and
lubricants, auxiliary materials
Fire prevention
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 lead last and remove it
first. To avoid sparks in the vicinity of the battery, connect the ground lead from the external power
source to the ground lead of the engine or to the ground terminal of the starter.
Always keep suitable firefighting equipment (fire extinguishers) at hand and familiarize yourself with
their use.
Noise
Noise can lead to an increased risk of accidents if it makes it more difficult to hear audible signals,
warning calls or noises indicating danger.
Wear ear protectors in workplaces with a sound pressure level in excess of 85dB (A).
Environmental protection and disposal
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 guidelines will invalidate the design type approval issued by the
emissions regulation authorities. The manufacturer does not accept any liability for violations of the
emission regulations. The maintenance schedules of the manufacturer must be observed over the entire
life cycle of the product.
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 and 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 "Spare Parts and Service" tabs at http://www.mtu-online.com.
Consumable fluids and materials may also be hazardous or toxic. When using fluids, lubricants, consum-
ables and other chemical substances, follow the safety regulations that apply to the product. Take spe-
cial care when using hot, chilled or caustic substances. When using flammable materials, prevent them
coming into contact with ignition sources and do not smoke.
Used oil
Used oil contains combustion residues that are harmful to health.
Rub barrier cream into hands.
Wash hands 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 that contain lead, avoid direct contact with the skin. Do not inhale
lead vapors.
• Wash hands 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 to be connected must either be designed for that pressure, or, if the permis-
sible pressure is lower than the system pressure, a pressure reducing valve and safety valve (set to
the permissible pressure) must be connected between the assemblies/products and the system.
• 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.
Paints and varnishes
• Observe the relevant safety data sheet for all materials.
• When painting in areas other than spray booths equipped with extractors, ensure good ventilation.
Make sure that neighboring work areas are not adversely affected.
• 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 regulation containers (without gas-tight
caps).
• 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.
• If spilled onto clothing, remove the affected clothing immediately.
• After contact with skin, rinse affected parts of the body with plenty of water.
• Rinse eyes immediately with eye drops 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
• DIN 912
• ISO 4014 (DIN 931-1)
• ISO 4017 (DIN 933)
• EN 28765 (DIN 960)
• 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 836
• DIN 938
• DIN 939
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%.
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
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
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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)
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 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
M20 x 1.5 430 495
M22 500 620
M22 x 1.5 560 675
M24 640 790
M24 x 2 700 850
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Thread Not torsion-protected MA(Nm) Torsion-protected MA(Nm)
M27 900 1170
M27 x 2 1000 1230
M30 1250 1575
*Protect screw shaft from torsion when tightening.
MA= tightening torques
Tightening torques for plug screws to MTN 5183-1 standard
This standard applies to plug screws to DIN 908, DIN 910 and DIN 7604 with threaded end to DIN 3852
Form A (sealed with sealing ring to DIN 7603-Cu).
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Tightening torques MA are given for screw plugs made of steel (St) with surface protected by a phos-
phate coating and oiled or galvanized.
Threads and mating faces beneath heads 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.
Tightening torques for plug screws to DIN 908, DIN 910 and DIN 7604A (with short threaded end).
Thread
Screwed into
Steel/gray cast iron MA
(Nm)
AI alloy MA
(Nm)
M10 x 1 15 15
M12 x 1.5 30 25
M14 x 1.5 35 30
M16 x 1.5 40 35
M18 x 1.5 50 40
M20 x 1.5 60 50
M22 x 1.5 70 70
M24 x 1.5 85 80
M26 x 1.5 100 100
M27 x 2 100 100
M30 x 1.5 110 110
M30 x 2 120 120
M33 x 2 160 160
M36 x 1.5 190 180
M38 x 1.5 220 200
M42 x 1.5 260 240
M45 x 1.5 290 270
M48 x 1.5 310 300
M52 x 1.5 325 320
M56 x 2 380 360
M64 x 2 400 400
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MA= tightening torques
Tightening torques for plug screws to DIN 7604C (with long threaded end)
Thread
Screwed into
Steel/gray cast iron MA
(Nm)
Al alloy MA
(Nm)
M8 x 1 10 10
M22 x 1.5 80 65
M26 x 1.5 105 90
M30 x 1.5 130 130
M38 x 1.5 140 120
M45 x 1.5 160 140
MA= tightening torques
Tightening torques for banjo screws to MTN 5183-2 standard
This standard applies to banjo screws to MMN 223 and N 15011 sealed with sealing ring to DIN 7603-
Cu.
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