Nanni T4.155 seriers Instruction manual

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T4.155 4.380 TDI 4.390 TDI
W
WO OR RK KS SH HO OP P M MA AN NU UA AL L
4
4 C Cy yl li in nd de er rs s
ENGINE BASE
NANNI INDUSTRIES 11 Av MARIOTTE 33260 LA TESTE FRANCE Tel: [phone] Fax: [phone]
E-mail: [e-mail] Web: www.nannidiesel.com
S.A.S au capital social de 2 040 000 € R.C.S Bordeaux B 380 707 638 000 17 APE 291 A TVA: FR 15380707638

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SOMMAIRE DU MANUEL D'ATELIER
NANNI DIESEL Base M1KZ
T 4.155 / 4.380 TDI / 4.390 TDI
ALL TIGHTENING TORQUES ARE INDICATED IN Nm and in kgf/cm
1st part:
Maintenance Manual
4 Main components 28 Setting injection timing
7 Safety information 31 Replacing the timing belt
9 General information 36 Compression measurement
10 Putting into service 38 Piston protrusion, cylinder head tightening
13 Engine operation 42 Marinisation - servicing
18 Servicing 45 Electricity, panel C3
19 Technical sheet 51 Electricity, engine harnesses
20 Recommendations 53 Special tools
21 Alternator belts 54 Exploded view of M1KZ base
22 Glow plugs
23 Adjusting valve clearance
2nd part:
Engine base disassembly and reassembly
71 Tightening torques (standard) 134 Fresh water pump and sender thermostat
74 Specific tightening torques 139 Thermostat
74 Engine characteristics 141 Pre-heating
78 Basic tooling 144 Oil pressure, oil injectors, oil pump, oil radiator
79 Timing pinions 161 Turbo charger
99 Cylinder head 163 Cylinder block
124 Injection pump and injectors
The technical data given in this manual is the latest available at the date of printing and is subject
to modification without notice.

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Manuel de Maintenance
MOTEUR Base M1KZ
T4.155 4.380 TDI 4.390 TDI
T4.155 4.380 TDI 4.390 TDI
(PART ONE)

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SAFETY INFORMATION
This operating manual has been published to help you use your engine and its equipment. Numerous important
instructions are given in this manual and need to be observed when operating the engine.
The operator must read this manual.
This manual must always be kept where the engine is used.
SAFETY SYMBOLS
These symbols are used to indicate a danger. The purpose of these symbols is to draw your attention to articles or
operations that may be dangerous for yourself or other users of the engine. Carefully read the instructions given. You
must read the safety rules, regulations and instructions before putting the engine into service.
DANGER
Means that extremely serious danger exists, that probably will cause death or permanent injury if the
appropriate special steps are not taken.
WARNING
Means that danger exists that may cause injury or death if the appropriate special steps are not taken.
CAUTION
Reminds you of the safety steps or draws attention to dangerous practice that could cause injury to
personnel or damage to the ship or its components.
The user will take all useful steps needed for operation and protection and, where necessary, request the advice of a
professional.
Non-observance of safety instructions may entail:
Bodily danger, danger of polluting the environment (leaks of dangerous substances), hardware danger with risk of
failure of the essential functions of the engine.
OBSERVE THE SAFETY RECOMMENDATIONS
- Comply with the caution and warning labels glued to the engine
- Remove the ignition key and close the battery isolation switch before working on the engine or
related equipment
- Close the engine hood and put back protection guards before starting the engine
- Always keep the work zone around the engine clean
- Store flammable liquids outside the engine compartment
- Never use the engine after taking alcohol or medicines
WEAR PROTECTIVE CLOTHING
- To avoid bodily injury, keep away from rotating parts and do not wear loose clothing when working close
to an operating engine
- Wear safety items such as goggles, gloves, etc... according to the circumstances and depending on
requirements

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FUELS AND LUBRICANTS
- Stop the engine before topping up with fuel and lubricants.
- Do not smoke close to the engine and keep any naked flames away when filling with fuel
- Wear gloves to detect a possible leakage.
- Hot oil can burn. Allow the engine to cool before checking the oil level, replacing the oil or the oil filter
cartridge.
- Always use the oils and fuels recommended by NANNI DIESEL.
EXHAUST GAS PREVENTION
- Run the engine in a properly ventilated space away from people or animals. The accumulation of exhaust
gas may be noxious.
PRESSURE
- Do not open oil or coolant caps when the engine is running or when it is hot. Release all pressure in
circuits before removing the caps.
- Do not check for possible pressure leaks with your bare hands. Wear gloves. Discharged fluids under
pressure may cause severe injury. If struck by a fluid jet, have the injury checked by a physician.
BATTERY
- An extremely explosive flammable and volatile detonating gas mixture forms when charging the battery.
Never smoke or come close to the battery with a naked flame or an object producing sparks.
- Never short-circuit the terminals of the battery.
- The electrolyte in the battery is highly corrosive. Wear gloves and protective goggles.
ELECTRICAL WIRING
- Cut the engine contact and the battery isolation switch before starting any work on electrical equipment.
- Check the condition of electrical wiring and cables. A short circuit can cause a fire.
SCRAPPING FLUIDS
- The different fluids used to operate the engine constitute a danger to health. Fully read the instructions
given on the packaging of these products.
- Observe the environmental protection rules related to scrapping of oil, fuel, coolant, filters and batteries.

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1. GENERAL INFORMATION
Your NANNI DIESEL engine is a high quality NANNI INDUSTRIES designed and manufactured product. This engine
is manufactured with the best materials according to precise specifications and strictly controlled manufacturing
methods.
Your NANNI DIESEL engine is a reliable and long-lasting source of power for your boat.
The in-board installation of the engine of your boat is very important to ensure safe navigation and also respect of the
environment.
NANNI INDUSTRIES engineers are amongst the most skilled worldwide. Their experience, knowledge of the
sea, control of technical procedures and methods associated with the competence of MAN, KUBOTA and
TOYOTA engineers ensure the best performance/reliability/investment ratio.
WARNING: Your engine must be installed by a shipyard or a NANNI INDUSTRIES representative in
compliance with the in-board installation instructions.
This operating manual contains all information required to ensure correct operation of the engine.
NANNI INDUSTRIES is represented in more than 50 countries by its network of agents and vendors, and guarantees
your safe navigation throughout the world. All services have been planned to meet your needs: spare parts, labor or
just simply advice.
Do not hesitate to contact your NANNI DIESEL approved vendor.
Good sailing.
Carefully read this manual before using the engine.
Observe the safety instructions.
WARNING: Correct operation of a marine engine is related to engine use adapted to the engine
characteristics and its transmission system (type of boat, use rate and time).
2. ENGINE IDENTIFICATION
The references indicated on the reverser and engine plates must be indicated in all correspondence, requests for
information and orders for spare parts.
ENGINE TYPE
SERIES NUMBER
SPECIFICATION
IMPORTANT: Write down the transmission system and engine model name and series number. Keep a copy
of this information in a safe location.

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IDENTIFICATION OF MAIN COMPONENTS
1. Temperature exchanger
2. Coolant filling port
3. Block drain plug
4. Fresh water pump
5. Sea water pump
6. Alternator
7. Flexible suspension
8. Electrical connector
9. Starter
10. Oil filling port
11. Suction pipe for oil drainage pump
12. Air filter
13. Water injection exhaust elbow
14. Anode
15. Oil filter
16. Oil pressure transmitter
17. Gear reducer reverser
18. Injection pump
19. Electrical stop
20. Acceleration control
21. Air cooler
22. Turbo charger
23. Exchanger drain coupling
24. Turbo charger degassing valve
25. Turbo charger drainage valve
26. Condensation evacuation hole
27. Battery negative (-) cable connection
28. Fuel coolant (only for 4.390)
29. Fuel filter
3. PREPARATION BEFORE PUTTING INTO SERVICE
When the engine has been installed and before removing the protection devices blanking the different ports, clean all
outer surfaces of the engine. These operations must be performed by the shipyard or an approved workshop.
GENERAL CHECK. (Refer to SILVERWAKE® warranty conditions.)
- Fill up the reverser and the engine oil tanks.
- Fill up the exchanger coolant tank. Degas at top point of turbo charger volute.
- Check belt tension.
- Check tightening of the different couplings and drainage caps (water and oil).
- Check tightening of electrical lugs, battery terminals, circuit breaker, extension connection, battery
electrolyte level.
- Check acceleration control.
- Verify correct synchronization of the "accelerator and reverser" lever (mandatory in the case of a single
level control). Clutching must be finished when acceleration starts.
- Perform a final check of attachments as well as a visual inspection of the entire marine power plant. If
necessary touch up paintwork on the unit and accessories.

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DANGER: Do not bring a flame or sparks close to the battery. An extremely explosive detonating gas
forms during battery charging. Do not cause a short circuit.
The battery electrolyte is highly corrosive. If the acid is spilt on skin, immediately wash it with soapy water. If
splashed into eyes, rinse generously with water and immediately consult a physician.
- Start with the positive terminal when connecting the cable to the battery.
- Start with the negative terminal when disconnecting the cable from the battery.
WARNING:
•Do not spill fuel or lubricant on the engine.
•The fluids used for engine operation are dangerous to health.
•Engine oil can damage the skin. Wear gloves.
NOTE: Modern diesel engines are precision made, requiring the use of high quality lubricants and fuel.
ENGINE AND GEAR BOX LUBRIFICATION
Engine
- Oil pump lubrication system, pressure adjusted by discharge valve
- Disposable cartridge oil filter
Transmission
Refer to separate specifications
Engine oil filling
Through the filling port located on the rocker cover by unscrewing the plug. Check the level with the gauge.
Never exceed the maximum mark.
NOTE: Oil quality and quantity are indicated in the technical specification table.
FUEL CIRCUIT
Composition
Disposable cartridge main filter
Sea water/fuel coolant (4.390 TDI)
Injection pump
High-pressure injection pipes
Injectors
Fuel circuit bleeding
- Check the fuel level in the tank.
- Open the fuel valve, open the bleed screw located at the top part of the filter, pump using the built-in
pump. Close the screw when the air bubbles disappear. If the entire injection circuit is unprimed, proceed
as follows:
- Loosen injector No.1 supply pipe, rotate the engine with the starter until fuel is discharged. Tighten the nut
and perform the same operation on the other injectors.
- Start the engine and check that there are no leaks

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DANGER: Do not smoke or bring a flame or sparks close to fuel.
Always wipe up spilled fuel.
COOLING SYSTEM
The system comprises two different circuits: the closed coolant circuit and the seawater circuit.
Closed coolant circuit
This circuit comprises a pump controlled by the crankshaft by means of two V belts, a water temperature exchanger,
an oil temperature exchanger integrated in the block and a thermostat.
Seawater circuit
The circuit comprises a pump, a fresh water-sea water temperature exchanger, a super-charger air coolant, a fuel
coolant (for 4.390 TDI), a reverser oil exchanger and an exhaust elbow.
Coolant
Recommendations for first start-up:
- Check torque of the drain plug located under the turbo charger. Open the vent cap located on the top of
the turbo charger volute.
- Prepare a permanent antifreeze mixture with 50% antifreeze and 50% fresh water. The quantity required
is in the technical data table.
Pour the mixture in the filling port. Close the vent cap on the top of the turbo charger when the mixture is visible.
Continue filling to maximum level. Future top-ups, if necessary, will be made with fresh water only, engine cold. Start
the engine and top up the level. Verify that there are no leaks.
Every two years, at the beginning of the navigation season, fully drain the cooling system, clean with fresh water and
fill again according to the previous instructions (Refer to SILVERWAKE guarantee conditions).
DANGER: Top up with coolant, engine stopped and cold. Do not smoke or bring a flame close by.
Keep away from rotating devices when the engine is running.
CAUTION: Never add pure antifreeze. Use of additives or other types of coolant may cause the
formation of insulating deposits and engine overheating.
Hot water connection
An installation can be connected to the engine for on-board water heating by a derivation of the internal soft water
circuit (refer to your NANNIDIESEL agent).
Seawater filter
A water filter must be adapted between the pump and the seawater intake. Verify and clean this filter on a regular
basis.
CAUTION: Before starting the engine, verify that the seawater intake is open, as dry operation for even a few
seconds can damage the rotor of the water pump.
After cleaning the seawater filter, carefully close the cover to prevent the water pump from sucking in air.

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4. ENGINE OPERATION
STARTING
DANGERS - Correctly close the engine cover and fit all protection guards before starting the engine.
- Check the fuel level.
- Open the fuel supply valve.
- Open the seawater intake valve.
- Check the engine and reverser oil levels.
- Check the coolant level.
- Close the battery isolation switch
- Make sure that the reverser control lever is in idle position
- Turn the starting key clockwise to the "contact" position. The oil warning light, battery charging and pre-
heating lights come on. The audible alarm can be heard. Pre-heating is active. Wait until the green light
goes out, and then turn the ignition key clockwise until the engine starts. Immediately release when the
engine has started.
- Check the indicators and other functions after engine starting.
- Immediately stop the engine if the alarm is given, if the temperature rises abnormally or if one or more
indicators remain on.
CAUTION: Search for and eliminate the cause before restarting the engine!
- Allow the engine to run at idle speed for 2 or 3 minutes.
- Verify that the seawater effectively flows out via the exhaust.
- If the engine does not start first time, repeat the operation, waiting between 5 and 15 seconds with the
contact cut between each attempt.
IMPORTANT:
Search for the cause if several unsuccessful attempts to start the engine have been made.
Never continue to insist, as there is a risk of water returning into the engine via the exhaust system.
WARNING: Never cut the electrical circuit using the battery isolation switch when the engine is running. An
operation of this type can damage the alternator.
ENGINE STOPPING
- return the lever to idle/dead point position
- Allow the engine to run at idle speed for several minutes to stabilize temperatures and turbo charger
speed.
- Never accelerate the engine before cutting the contact.
- Turn the key to position "O" (vertical).
- Cut off the battery isolation switch, close the seawater intake valve and the fuel supply valve.
IMPORTANT: if it is necessary to tow the boat, stop the engine and close the sea water intake valve to avoid
accidental filling of the engine with sea water.

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TWIN ENGINE BOATS: When navigating with a single engine, close the seawater intake of the engine shut down. Do
not forget to open it before restarting the engine.
CAUTION: Check the engine and the engine compartment to detect any possible leaks.
RUNNING IN – GUARANTEE INSPECTION OPERATIONS
Running in
During the first 20 hours of operation, it is recommended to use your engine carefully and only run at maximum rate
for short periods of time.
Do not race the engine immediately after starting it without allowing it to warm up.
Guarantee inspection operations
All preventive maintenance operations, as well as related frequencies, are described in the guarantee
logbook: SILVERWAKE®.
These inspection operations govern the validity of the guarantee. They must be carried out by an approved NANNI
DIESEL representative.
New engines are guaranteed against any defective parts according to the methods specified in the SILVERWAKE®
guarantee logbook handed over to the buyer when the engine is delivered.
5. SERVICING
DANGER: To prevent any bodily injury, shut down the engine and allow it to cool. Turn off the battery
isolation switch before carrying out any work.
Observe the safety and environment protection instructions.
IMPORTANT – These recommendations must be observed. Observance of the recommendations will extend the
service life of the engine and govern normal coverage of the engine guarantee.
- Do not make any unauthorized modifications to the engine.
- Damage caused by the use of non-original spare parts are not covered by the guarantee.
- Servicing operations and repairs must be carried out by an approved NANNI DIESEL workshop.
Servicing must be carried out once a year if the engine is used for a number of hours less than the given number.
In this case, it is recommended to carry out servicing operations before wintering. The engine will then be protected by
new, clean lubricating oil. This does not exclude the wintering operations quoted in the SILVERWAKE guarantee.
Valve clearance adjustment
These operations must be carried out by a specialized workshop (calibrated adjustment shims).
Frequency: according to the maintenance table.
- (refer to the values in the technical data table).
Replacing the water pump rotor
- Close the seawater intake valve.
- Remove the water pump cover.
- Extract the worn rotor using multi-grip pliers.
- Clean items kept.
- Install a new rotor.
- Reinstall the seawater pump cover using a new gasket.
- Open the seawater intake valve.
- Start the engine and check circuit sealing.
Electrical equipment
- Regularly check the alternator belt tension. Tension the belt between the pulleys
(190 Nm using a DENSO controller).

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DANGER – Shut down the engine and turn off the battery isolation valve before performing any work on the
electrical system
Battery
- Check the condition of battery elements once per season.
- The density of the electrolyte must be between 1.270 and 1.285.
- Check the electrolyte level periodically. The level must be 1cm above the plates. Only add distilled water if
necessary.
DANGER – Never bring a flame close to the battery or check the battery with a spark, as the discharged
gasses are flammable and explosive. The electrolyte in the battery is highly corrosive. If the acid touches
the skin, immediately wash with soapy water. If splashed into the eyes, generously rinse with water and
immediately consult a physician.
- Do not short circuit.
RECOMMENDATIONS
To ensure perfect operation of the alternator and the built-in regulator, never:
- Turn off the main battery isolation switch of the circuit when the engine is running (regulator can be
destroyed).
- Reverse battery terminals. The terminals are respectively marked + (positive) and – (negative). The latter
indicated terminal is connected to earth. Cable terminals, as well as cables, must be correctly secured.
- Change the circuit load when the engine is running.
Install a load distributor (Consult a NANNI DIESEL representative) to use several batteries.
When starting with a spare battery and jumper leads, proceed as follows:
- Disregard the main battery circuit, connect the spare battery to the main battery by connecting the + to the
+ and the – to the -. As soon as the engine starts, remove the jumper cables and do not turn off the main
battery circuit.
You must disconnect the two battery cables when:
- you use a battery charger
- before any work on electrical equipment
- before performing welding work on a metal hull
Cooling circuit rinsing
Fresh water circuit
- Open the filling cap located on the exchanger.
- Open the draining plug under the turbo charger volute.
- Loosen the hollow screw coupling located under the exhaust manifold.
- Remove the block drainage plug located on the thermostat support.
- Drain old fluid from the temperature exchanger and the engine block.
- Fill the circuit with fresh water and allow the engine to run for a few minutes.
- Apply the filling/priming procedure described in the "Closed cooling circuit" paragraph.
- Drain the water and fill again with antifreeze/fresh water mixture.
- Top up the cooling circuit according to the specifications.
NOTE: If a hot water circuit is connected to the engine, fully drain it and refill taking into account the added quantity of
mixture. Make sure that the air in the circuit is fully evacuated during filling.
WARNING: Pressurized fluid. Do not open the cap when the engine is hot. Allow the engine to cool and
carefully open the cap.

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Seawater circuit
- Close the seawater intake valve.
- Drain all seawater intake pipes, the filter, the seawater pump, the temperature exchanger and pipe by
loosening the attachment collars.
- Drain the exhaust circuit, as a certain quantity of water remains in the bottom of the "water lock" exhaust
silencer.
Clean the oil reverser and fuel, air, water temperature exchanger (if fitted).
Check the exchanger cores.
- Remove the covers.
- Remove the cores (except fuel exchanger), clean them with water and a non-corrosive commercially
available product. Generously rinse.
- Replace o-rings and reinstall sub-assemblies
WARNING: Corrosive products are a potential danger for health. Carefully read the instructions on product
packaging.
Replacing the fuel filter
The fuel filter is of the disposable type.
- Close the fuel valve.
- Coat the sealed new cartridge with clean oil
- Screw the new cartridge to the filter head, then tighten by hand ¾ of a turn (do not use tooling).
- Open the fuel valve.
- Bleed the circuit.
- Start the engine and check sealing.
CAUTION: Always wipe up spilled fuel.
Observe the environment protection instructions.
Replacement of an injector
Remove:
- The injection pipe bar assembly
- The fuel return bar assembly
- The complete injector.
- Disassemble the injector.
- Replace the gasket and the injector nozzle.
- Check the calibration of the injector and atomization. Reinstall the components.
WARNING: Never spray fuel onto the skin. Wear gloves.
IMPORTANT: These works must be carried out by a NANNI DIESEL approved workshop. Injectors must be checked
every 400 hours or every 2 years, according to the maintenance table and the SILVERWAKE® logbook.
Draining of engine crank case oil
The oil is extracted by a drain pump preferably with the engine warm.
- Pump until all the oil is extracted.
- Top up with fresh oil.
- Using the gauge, check that the level never exceeds the maximum level.
WARNING: Hot oil can burn. Avoid any contact with the skin.
Observe environment protection rules.

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Oil filter replacement
- The cartridge is of the disposable type.
- Connect a pipe to the sleeve of the filter head bowl and connect to a recipient.
- Unscrew the filter head cartridge.
- Coat the gasket of the cartridge with clean oil.
- Screw the new cartridge onto the filter head, then tighten by hand, ¾ of a turn (do not use tooling).
- Start the engine and check for leaks.
- Stop the engine and top up the oil level if necessary.
WARNING: Hot oil can burn. Avoid any contact with the skin.
Observe environment protection rules.
Reverser
Refer to detailed instructions in the reverser manual attached to the operating manual.
Reverser control system
Check the remote controls on a regular basis. The travel of the cable must be 35 mm either side of the dead point (O
– A = O – B). The lever must be able to travel over its entire course.
Caution: lever positions
DANGER: To avoid any bodily injury, do not start the engine without the air filter.

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FICHE TECHNIQUE
MOTEURS TYPE:
T4.155 / 4.380 TDI / 4.390 TDI
CHARACTERISTICS LUBRICATION
Number of cylinders: 4
Total displacement: 2982 Cm3
Bore-stroke: 96 x 103 mm
Cylinder ratio: 19.7/1
Compression pressure: 3 MPa minimum
Maximum difference per cylinder: 0.5 MPa
Maximum speed under load: 3600 rpm
Maximum unload speed: 4200 rpm
Idle speed: 800 rpm
Injection order: 1-3-4-2
Rotation direction: counter-clockwise
(viewed from fly wheel)
Cylinder No.1: timing side
Idle oil pressure: 30kPa min.
Normal oil pressure: 250 ~ 600 kPa
Lubrication oil: API CD~CF15W40
(MOTUL TEKMA MEGA OR MOTUL MARINE 4T)
Capacity: 6.4 – 7.7 liters, depending on inclination
Reverser: depends on type
Capacity: depends on type
Oil: depends on type
COOLING CIRCUIT
Capacity: 15.5 liters
Thermostat opening: 71°C
INJECTION TIMING
Injectors: Denso
Injection pump: Denso rotative
Injection pressure: 15.2 MPa
Injection setting: 0.46 – 0.02 mm
Cold valve clearance:
Intake: 0.20 ~0.30 Exh: 0.25 ~0.35
Adjustment by shims, thickness 0.05 mm
Piston protrusion: 0.08 ~0.33 mm
TURBOCHARGER RINGS
Delivered pressure:
T4.155: 80 ~ 90 kPa
4.380 TDI: 85 ~ 95 kPa
4.390 TDI: 93 ~ 103 kPa
Axial clearance: 0.173 mm
Clearance at gap:
- Top compression ring: 0.350 – 0.570 mm
limit: 1.03 mm
- compression ring: 0.40 – 0.60 mm
limit: 1.10 mm
- scraper: 0.20 – 0.50 mm
limit: 0.87 mm
EXHAUST TEMPERATURE CYLINDER HEAD
T4.155: 450 ~ 500°C , 4.380 TDI: 570 ~ 600°C, 4.390
TDI: 550~ 580°C Flatness: < 0.15 mm
SEA WATER PUMP
Flow rate: 125 liters/min @ 3600 rpm
TIGHTENING TORQUE
Cylinder head cover: 9 Nm
Cylinder head screw: 39 Nm + 90° +90°
Fly wheel screw: 145 Nm
Connecting rod screw: 29 Nm + 90°
Bearing screw: 49 Nm + 90°
Cam shaft pulley: 98 Nm
Crankshaft pulley: 363 Nm
Injector carrier/cylinder head 37 Nm
Injector nozzle/ cylinder head: 64 Nm
Glow plugs: 13 Nm
Injection pump shaft nut: 64 Nm
Starter B+ terminal nut: 4 Nm
ELECTRICITY
Glow plug resistance: 0.65Ω
Recommended battery: 12V 100/110 Ah
Alternator ND 14V 80A
Rev sensor: 650 ~ 970Ω
Rev counter pulse: 018.50
Starter: 12V 2.2kW
1 kgf/m ≈10 Nm 1 bar ≈100 kPa 10 bar ≈1 MPa

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RECOMMENDATIONS
LUBRICATION AND COOLING
E
EN NG GI IN NE E O OI IL L
API -CD~CF 15 W 40
Mineral
(MOTUL TEKMA MEGA OR MOTUL MARINE 4T)
C
CO OO OL LA AN NT T
50% PURE ANTIFREEZE
50% FRESH WATER
(MOTUL ANTIFREEZE)

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ALTERNATOR BELTS
GLOW PLUGS
CHECKING THE ALTERNATOR DRIVE BELT
CHECK THE ALTERNATOR DRIVE BELT
a) Check the drive belt and verify the amount of fraying, clogging or wear.
Check that the top of the drive belt does not touch the bottom of the pulley
groove. If one of the two drive belts is defective, replace both drive belts.
b) Check the sag in the drive belt by pressing the belt with a finger, at the
locations indicated in the drawing , with a force of 98 N (10 kgf).
Drive belt sag:
New belt: 6 – 8 mm
Belt in service: 8 – 12 mm
Readjust drive belt tension if the drive belt sag is not within the limits stipulated
in the specifications.
Special tool reference: 97031 2375
Reference
Measure the drive belt tension with special maintenance tool.
Drive belt tension:
New belt: 38 – 62 kgf
Belt in service: 20 – 40 kgf

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WARNING:
•"New belt" means a belt that is installed in an engine and that has rotated
for less than 5 minutes.
•"Worn belt" means a belt that is rotated in an engine and that has turned
for at least 5 minutes.
•After installing a new drive belt, run the engine for at least 5 minutes and
verify the sag or the tension of the drive belt.
CHECKING GLOW PLUGS
REMARK: the resistance of glow plugs must be checked when the engine is
fitted. Avoid removing and reinstalling glow plugs as far as possible.
CHECK GLOW PLUGS
Use an ohmmeter to verify the continuity between the terminal and the earth of
each glow plug.
Resistance (measured cold): approx 0.65Ω
Replace any glow plug with a resistance greater than 1.0Ω