65E, 75E, 85E and 95E Agricultural Tractors Caterpillar

The Engine Starts Hard or the Engine Does Not Start

Table 1

The Engine Starts Hard or the Engine Does Not Start.
Cause	Solution
You are starting the engine incorrectly.	See Operation and Maintenance Manual, "Engine Starting".
The fuel level is low or the fuel tank is empty.	Check the fuel level, the fuel lines, and the fuel filters.
The temperature is too cold.	Use the ether starting aid. Make sure that you are using the correct type of fuel.
There is air in the fuel lines.	Purge the air from the fuel lines.
The incorrect viscosity oil was used in the engine.	Check the engine for the correct oil viscosity.
The fuel system is contaminated.	Clean the fuel system.
The fuel pressure is low.	Check for a 63 diagnostic code. If you find low fuel pressure, replace the fuel filters. Make sure that there is no dirt in the fuel, no water in the fuel, and no air in the fuel. Cranking the engine should build fuel pressure to 344 kPa (50 psi). If the fuel pressure does not reach 344 kPa (50 psi), use the hand priming pump to build the pressure. When 344 kPa (50 psi) is reached, you will hear a click in the filter base. If the fuel pressure does not reach 344 kPa (50 psi), check the fuel regulator valve and check the spring. The fuel regulator valve is located behind the fitting in the return line in the secondary fuel filter base. If the fuel regulator valve is functioning, check the fuel regulator valve for the fuel transfer pump. The regulator valve is located behind the plug on top of the pump. If the fuel regulator valve is functioning, replace the pump.
The fuel filter is clogged.	Replace the fuel filter element.
The fuel injectors are malfunctioning.	Consult any CLAAS dealer.
The engine control module (ECM) is not functional.	Check the harness connections in order to verify that power is available. Use the diagnostic switch in order to examine the engine. See Operation and Maintenance Manual, "Engine Status Lamp".
The engine is not tuned correctly.	Consult any CLAAS dealer.

The Engine Misfires or The Engine Runs Rough

Table 2

The Engine Misfires or The Engine Runs Rough.
Cause	Solution
The fuel injectors are damaged.	Consult any CLAAS dealer.
The valve clearance is not correct.	Set the valve clearance to the correct value.
The fuel injection timing is not correct.	Consult any CLAAS dealer.
A high pressure fuel line is bent or a high pressure fuel line is broken.	Replace the line.
The fuel pressure is low.	Check for a 63 diagnostic code. If you find low fuel pressure, replace the fuel filters. Make sure that there is no dirt in the fuel, no water in the fuel, and no air in the fuel. Cranking the engine should build fuel pressure to 344 kPa (50 psi). If the fuel pressure does not reach 344 kPa (50 psi), use the hand priming pump to build the pressure. When 344 kPa (50 psi) is reached, you will hear a click in the filter base. If the fuel pressure does not reach 344 kPa (50 psi), check the fuel regulator valve and check the spring. The fuel regulator valve is located behind the fitting in the return line in the secondary fuel filter base. If the fuel regulator valve is functioning, check the fuel regulator valve for the fuel transfer pump. The regulator valve is located behind the plug on top of the pump. If the fuel regulator valve is functioning, replace the pump.
There is air in the fuel system.	Find the air leak. Correct the problem. Purge the air from the fuel system.

The Engine Has Low Power

Table 3

The Engine Has Low Power.
Cause	Solution
The fuel pressure is low.	Check for a 63 diagnostic code. If you find low fuel pressure, replace the fuel filters. Make sure that there is no dirt in the fuel, no water in the fuel, and no air in the fuel. Cranking the engine should build fuel pressure to 344 kPa (50 psi). If the fuel pressure does not reach 344 kPa (50 psi), use the hand priming pump to build the pressure. When 344 kPa (50 psi) is reached, you will hear a click in the filter base. If the fuel pressure does not reach 344 kPa (50 psi), check the fuel regulator valve and check the spring. The fuel regulator valve is located behind the fitting in the return line in the secondary fuel filter base. If the fuel regulator valve is functioning, check the fuel regulator valve for the fuel transfer pump. The regulator valve is located behind the plug on top of the pump. If the fuel regulator valve is functioning, replace the pump.
The throttle position sensor is defective.	Inspect the wiring and the connectors for damage or for wear. Repair any damage. Check the adjustment of the sensor. Take a reading of the sensor. Check the supply voltage of the sensor. Inspect the decelerator pedal for damage. Also, inspect the linkage for the decelerator pedal.
The quality of the fuel is poor.	Remove the bad fuel from the fuel tank. Fill the fuel tank with quality diesel fuel. Replace the fuel filters.
There is a restriction in the air cleaner.	Check the air cleaner for a restriction.
The valve clearance is not correct.	Set the valve clearance to the correct value.
The unit injectors are damaged.	Consult any CLAAS dealer.
The engine is overloaded.	Shift to a lower gear or reduce the load.
The fuel injection timing is not correct.	Consult any CLAAS dealer.
The diesel engine operating temperature is too low.	Check the thermostats.

The Engine Stalls at Low RPM

Table 4

The Engine Stalls at Low RPM.
Cause	Solution
The idle speed is too low.	Consult any CLAAS dealer.
The fuel pressure is low.	Check for a 63 diagnostic code. If you find low fuel pressure, replace the fuel filters. Make sure that there is no dirt in the fuel, no water in the fuel, and no air in the fuel. Cranking the engine should build fuel pressure to 344 kPa (50 psi). If the fuel pressure does not reach 344 kPa (50 psi), use the hand priming pump to build the pressure. When 344 kPa (50 psi) is reached, you will hear a click in the filter base. If the fuel pressure does not reach 344 kPa (50 psi), check the fuel regulator valve and check the spring. The fuel regulator valve is located behind the fitting in the return line in the secondary fuel filter base. If the fuel regulator valve is functioning, check the fuel regulator valve for the fuel transfer pump. The regulator valve is located behind the plug on top of the pump. If the fuel regulator valve is functioning, replace the pump.
The engine is overloaded.	Shift to a lower gear or reduce the load.

The Engine Speed Changes Suddenly

Table 5

The Engine Speed Changes Suddenly.
Cause	Solution
The engine control module (ECM) is malfunctioning.	Check the supply voltage to the ECM. Check the ECM for faults. Consult any CLAAS dealer. (1)

( 1 )

CLAAS dealers have the tools and the trained personnel for this service.

The Combustion Noise Is Too Loud

Table 6

The Combustion Noise Is Too Loud.
Cause	Solution
There is air in the fuel system.	Purge the air from the fuel system.
The unit injectors are damaged.	Consult any CLAAS dealer.
The fuel injection timing is not correct.	Consult any CLAAS dealer.

There Is Not Enough Valve Clearance

Table 7

There Is Not Enough Valve Clearance.
Cause	Solution
The valve seat or the face of the valve is worn.	Set the valve clearance to the correct value. The cylinder head should be reconditioned. Consult any CLAAS dealer. (1)

( 1 )

CLAAS dealers have the tools and the trained personnel for this service.

The Valve Rotocoil And The Spring Lock Are Free

Table 8

The Valve Rotocoil And The Spring Lock Are Free.
Cause	Solution
The valve keepers are broken.	Severe damage to the engine could result. Replace all damaged parts. Consult any CLAAS dealer.
The valve spring is broken.	Replace the valve spring.
There is a broken valve.	Severe damage to the engine could result. Replace all damaged parts.

There Is Too Much Noise In The Engine

Table 9

There Is Too Much Noise In The Engine.
Cause	Solution
The connecting rod bearing has failed.	Replace the bearing. Check the connecting rod and check the crankshaft. Consult any CLAAS dealer.
The timing gear train is damaged.	Replace any damaged components.

There Is Too Much Vibration

Table 10

There Is Too Much Vibration.
Cause	Solution
The engine mounts may be loose, worn, or damaged. Also, the transmission mounts may be loose, worn, or damaged.	Tighten the mounts. As required, replace components. Consult any CLAAS dealer.
The pulley and the damper are loose.	Tighten the loose components.
The pulley or the damper is loose.	Replace damaged components.
The drive shaft coupling has failed.	Replace the coupling.
The engine is misfiring.	See "The Engine Misfires or The Engine Runs Rough".
The fan is not balanced correctly. Also, the fan may be loose.	Loosen the fan drive belts. Then, remove the fan drive belts. Operate the engine for a short time at the affected speed range. If the vibration is not present, replace the fan assembly.

The Engine Emits Too Much White Smoke

Table 11

The Engine Emits Too Much White Smoke.
Cause	Solution
The weather is too cold.	White smoke is normal when you start the engine in cold weather.
There is air in the fuel system.	Purge the air from the fuel system. Check for air leaks on the inlet side of the engine oil suction tube.

The Engine Emits Too Much Blue Smoke

Table 12

The Engine Emits Too Much Blue Smoke.
Cause	Solution
There is too much wear on the valve guides.	Recondition the cylinder head assembly.
The piston rings are stuck or the piston rings are broken. Also, the piston rings may be worn.	Replace the piston rings. Consult any CLAAS dealer.
The engine oil level is too high.	Avoid overfilling the engine. Determine the cause. Drain excess oil.
The fuel injection timing is not correct.	Consult any CLAAS dealer.
The engine is misfiring.	See "The Engine Misfires or The Engine Runs Rough".

The Engine Uses Too Much Oil

Table 13

The Engine Uses Too Much Oil.
Cause	Solution
Oil is leaking from the engine.	Replace gaskets or seals. Tighten all connections.
There is too much oil to the intake.	See "The Engine Has Low Power".
The engine oil level is too high.	Avoid overfilling the engine. Determine the cause. Drain excess oil.
The oil operating temperature is too high.	Check the oil cooler bypass valve. Replace the oil cooler bypass valve if the oil cooler bypass valve is damaged. Clean the oil cooler core.
The piston rings are worn.	As required, replace components. Consult any CLAAS dealer.
The engine is overloaded.	The engine may be operating with increased power. Check the power output. As required, adjust the engine.
The piston rings are worn.	Replace the piston rings. Consult any CLAAS dealer.

The Engine Oil Pressure is Too Low

Table 14

The Engine Oil Pressure is Too Low.
Cause	Solution
The engine oil is diluted with diesel fuel.	Check the lip type seals on the drive shaft for the fuel transfer pump. Drain the crankcase. Refill the crankcase with clean engine oil.
The suction bell is damaged.	Replace the suction bell.
The crankshaft bearings have excessive clearance.	Replace the crankshaft bearings and/or replace the crankshaft. Check the operation of the oil filter.
The bearings for the timing gear have excessive clearance.	Inspect the bearings. As required, replace components.
The bore of the rocker arm is too large or the rocker arm has too much wear.	Check the lubrication. As required, replace components.
The oil pump is damaged.	Repair the oil pump or replace the oil pump. Consult any CLAAS dealer.
The oil pressure gauge and/or the oil pressure sender are malfunctioning.	Install a new oil pressure gauge and/or install a new oil pressure sender.
The oil pump relief valve is stuck.	Clean the oil pump relief valve and clean the housing. As required, replace the components.
The oil filter is plugged.	Install a new oil filter.
The oil level is too low.	Check the oil level. As required, add engine oil.
There is air in the oil.	Check for foaming oil.

There is Coolant in The Engine Oil

Table 15

There is Coolant in The Engine Oil.
Cause	Solution
The cylinder head gasket has failed.	Replace the cylinder head gasket. Maintain the proper torque on the bolts for the cylinder head.
The cylinder head is cracked or the cylinder head is damaged.	Replace the cylinder head. Consult any CLAAS dealer.
The cylinder block is cracked or the cylinder block has a defect.	Replace the cylinder block. Consult any CLAAS dealer.
The oil cooler is leaking.	Install a new core for the oil cooler. Drain the crankcase. Fill the crankcase with clean engine oil. Install a new oil filter element.

There is Engine Oil in the Coolant

Table 16

There is Engine Oil in the Coolant.
Cause	Solution
The water pump cavity drain is plugged.	Unplug the water pump cavity drain.
The oil cooler core has failed.	Replace the oil cooler core.
The head gasket has failed.	Replace the head gasket.

The Coolant is Too Hot

Table 17

The Coolant is Too Hot.
Cause	Solution
The engine speed is too low.	Low power can cause fan speed that is too slow.
Air flow through the radiator screen is restricted.	Clean the radiator screen.
The coolant level is too low.	Determine the cause of the low coolant level. Replace gaskets that leak and replace hoses that leak. Tighten all connections. Add coolant.
The thermostat is damaged or the temperature gauge is damaged.	Check the thermostat for correct opening temperature. Also, make sure that the thermostat is correctly installed. Check the temperature gauge for proper operation. As required, replace components.
Air flow through the radiator is restricted.	Remove debris from the outer surface of the radiator.
There is combustion gases in the coolant.	Find the combustion gas leakage. As required, repair the components or replace the components.
The water pump is damaged.	Check the water pump impeller. As required, repair the water pump.

The Engine Emits Too Much Gray Smoke or the Engine Emits Too Much Black Smoke

Table 18

The Engine Emits Too Much Gray Smoke or the Engine Emits Too Much Black Smoke.
Cause	Solution
There is not enough air for combustion.	Check the air cleaner for a restriction.
A fuel injector is plugged or a fuel injector is leaking.	Replace the fuel injector.
The fuel setting is incorrect or the injection timing is incorrect.	Consult any CLAAS dealer.
The turbocharger has failed.	Consult any CLAAS dealer.
The air/fuel ratio is not correct.	Consult any CLAAS dealer.

The Engine Uses Too Much Fuel

Table 19

The Engine Uses Too Much Fuel.
Cause	Solution
Fuel is leaking from the fuel system.	Internal leaks may cause large changes in fuel consumption. Low oil pressure and high oil level in the engine oil pump may accompany internal leaks. Replace components that leak.
Engine knock results from poor combustion.	Small increases in fuel consumption may be caused by a damaged fuel injection nozzle or the result of misfiring. Also, small increases in fuel consumption may be caused by the causes of low engine power. See "The Engine Has Low Power".
The fuel setting is not correct.	Consult any CLAAS dealer.
The fuel injection timing is not correct.	Consult any CLAAS dealer.
The air/fuel ratio adjustment is not correct.	Check the air/fuel ratio adjustment. As required, rebuild the air/fuel ratio control system.