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This Perkins diesel engine Fault Finding Guide should
assist you in identifying the probable cause of the problems which can
occur with your Perkins or ADE (Perkins) engine. Using the table of
contents below, you can identify the problem, and a remedy can then be
applied.
Some remedies require that the relevant Perkins Workshop Manual be
consulted, in which case the problem should be referred to one of our
appointed Perkins service dealers in Southern Africa (see Dealer Network).
Note that the fuel injection equipment fitted to Perkins and ADE
(Perkins) diesel engines is manufactured to extremely tight tolerances and
cannot tolerate the presence of dirt particles. Therefore, if the fuel
injection equipment, such as the lift pump, the fuel injection pump or the
atomisers are suspect, then the equipment should be removed from the
engine and taken to a specialised fuel injection equipment workshop for
testing and repair, or new replacement components fitted.
WARNING! USE ONLY GENUINE PERKINS PARTS! STILL HAVEN'T SOLVED YOUR PROBLEM?
Removal of engine seals, or the breaking of
the seals, on the fuel injection pumps, will render any warranty claim on
a Perkins engine, if still applicable, null and void.
If any problems occur
with your Perkins or ADE (Perkins) engine or the components fitted to it,
your Perkins service dealer can undertake the necessary repairs and will
ensure that only the correct, genuine Perkins parts are fitted to your
engine, according to the engine serial number, and that the work is done
correctly.
Should the problem
with your Perkins or ADE (Perkins) engine not be one of those discussed in
the Fault Finding Guide, please e-mail our Technical
Support Engineer explaining your engine problem and he will be happy
to advise you.
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| STARTING PROBLEMS |
| LOW CRANKING SPEED |
| INCORRECT GRADE OF LUBRICATING
OIL Check with the user or his supplier that the oil brand and viscosity is in accordance with the approved list. See the relevant Service Literature. BATTERY CAPACITY LOW (VOLTAGE) Ensure that the battery is to the manufacturer's specification. Check the battery capacity and replace if necessary. BAD ELECTRICAL CONNECTIONS BETWEEN BATTERY, STARTER MOTOR AND EARTH Check for corroded or loose connections. Clean, tighten or remake connections as necessary using the correct cable specification. FAULTY STARTER MOTOR Check the voltage drop at the starter motor with the starter switched on. Check with the manufacturer's specification. Voltage drop normal - Replace or repair starter motor Voltage drop excessive - Have auto-electrician investigate further |
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| COLD ENGINE WILL NOT START |
| INCORRECT USE OF COLD STARTING
EQUIPMENT Refer to the Perkins handbook, check that the book being used is relevant to the engine type with the problem. FAULTY COLD STARTING EQUIPMENT Check the continuity of the electrical circuit in the cold starting equipment by an indicated voltage at the heater terminals when switched on. The CAV "Thermostart" is fitted to many types of Perkins engines and with the air cleaner or hose removed from the induction manifold, the functioning of the unit can usually be seen. When the unit is switched to the "heat" or "H" position, the "Thermostart"should glow and as the fuel valve in the unit opens, a flame should appear. If not, then there is either no fuel available, or the "Thermostart" is faulty. Glow plugs can also be found fitted in Perkins engineers. When 12 volt glow plugs are first switched on, there is an initial current of about 40 amperes settling to about 10 amperes after about 10 seconds, with a terminal voltage of 11-12 volts. Some in-line fuel injection pumps are fitted with an excess fuel device. Check that the remote controls are operating satisfactorily. If "Start Pilot" aids are used, ensure the equipment is used strictly according to the manufacturer's instructions. Never attempt to use heaters in conjunction with ether type starting aids. INCORRECT GRADE OF FUEL Where necessary, check the specification of the fuel with the supplier, against the relevant Service Literature. See sections "LOW CRANKING SPEEDS" "ENGINE IS DIFFICULT TO START" "ENGINE WILL NOT START" |
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| ENGINE IS DIFFICULT TO START |
| Assuming that the problems LOW
CRANKING SPEED and COLD
ENGINE WILL NOT START have been resolved, proceed as follows:
AIR IN THE FUEL SYSTEM RESTRICTED FUEL FEED PIPE OR BLOCKED VENT IN THE FUEL TANK Trace and rectify restriction or blockage. CHOKED FUEL FILTERS Renew fuel filter element(s). DEFECTIVE FUEL LIFT PUMP Check lift pump operation, if insufficient fuel is flowing, repair or replace fuel lift pump. POOR COMPRESSIONS Check, as in the "POOR Compression" section. STICKING VALVES OR INCORRECT VALVE TIP CLEARANCE Adjust valve tip clearance according to the relevant manual. Inspect valves, guides, springs and rocker assembly for wear. INCORRECT FUEL PUMP TIMING OR INCORRECT VALVE TIMING Check all aspects of valve and fuel pump timing according to the relevant manual. EXHAUST PIPE RESTRICTION Examine the complete exhaust system, checking for dents or kinks in the pipes, check for broken mufflers. DEFECTIVE OR INCORRECT ATOMISERS Check that the correct part number is fitted. Replace or service all the atomisers. DEFECTIVE FUEL INJECTION PUMP Remove pump for attention by specialised workshop or fit replacement pump. |
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| ENGINE STARTS AND STOPS |
| INSUFFICIENT FUEL IN TANK Ensure that the fuel level in the tank is sufficient, if too low it may allow air to be drawn into the system at intervals, consequently stopping the engine. AIR IN FUEL SYSTEM Bleed the fuel system as instructed in the relevant Service Literature. CHECK LOW PRESSURE FUEL PIPES ON SUCTION SIDE, FOR HAIRLINE CRACKS OR LOOSE CONNECTIONS ALLOWING AIR INTO THE SYSTEM Rectify as necessary. BLOCKED FUEL TANK VENT Check and rectify as necessary. CHOKED FUEL FILTER/S Check and re-new as necessary. RESTRICTION IN FUEL RETURN PIPE Ensure that the fuel return pipe from the injection pump is not restricting fuel return in any way. i.e. Blocked, kinked, etc., as this will cause the engine to stop as the rev/min is raised. RESTRICTION IN THE INDUCTION SYSTEM Check air cleaner/element, re-new if dirty. Ensure that no restriction is present in induction piping. STICKING ATOMISER/S Remove for attention of specialised workshop. EXHAUST PIPE RESTRICTION Check and clear restriction. |
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| ENGINE WILL NOT START |
| INSUFFICIENT FUEL IN TANK Ensure that there is sufficient fuel in the tank. FAULTY STOP CONTROL OPERATION Ensure that the engine stop control operation is functioning, and is in the "run" position. See Sections: LOW CRANKING SPEED COLD ENGINE DOES NOT START ENGINE IS DIFFICULT TO START Ensure items in these sections are in order. BROKEN FUEL INJECTION PUMP DRIVE Check by removing the fuel injection pump inspection plate (see relevant Service Literature), turn the engine and check that the inside of the pump is rotating. If not, remove it and check the quill (drive) shaft of the pump, the drive (timing) gears and/or the auxiliary fuel injection pump drive arrangement. |
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| ENGINE MISFIRES |
| RESTRICTION IN THE INDUCTION
MANIFOLD Check air cleaner/element condition. Check for dents or kinks in the hoses and pipes and examine the induction manifold for any obstruction. INCORRECT TYPE, OR CROSSED HIGH-PRESSURE PIPES No. 1 outlet on fuel injection pumps is given in relevant Service Literature. Check rotation of pump and engine firing order for correct pipe fitting. AIR IN THE FUEL SYSTEM, RESTRICTED FUEL FEED PIPE, OR INCORRECT VALVE TIP CLEARANCES Refer to Section "Engine is difficult to start". DEFECTIVE FUEL LIFT PUMP Remove outlet pipe and check there is sufficient fuel available from the lift pump, if in doubt replace unit. BROKEN OR WEAK VALVE SPRINGS, STICKING VALVES, OR INCORRECT VALVE TIP CLEARANCES Refer to relevant Service Literature to check valve spring length at a known load. Adjust valve tip clearances. INCORRECT FUEL PUMP TIMING OR INCORRECT VALVE TIMING Check engine timing by referring to the relevant Service Literature. DEFECTIVE OR INCORRECT TYPE FUEL INJECTION PUMP. DEFECTIVE OR INCORRECT TYPE ATOMISERS Check that the correct part number is fitted. Remove equipment to the specialised fuel injection workshop for checking and servicing. POOR COMPRESSIONS Refer to the "POOR COMPRESSION" section. OVERHEATING Refer to the "OVERHEATING" section. |
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| LACK OF POWER |
| Confirm the complaint by a road test,
ensuring that the engine reaches normal operating temperature and
that the test conditions are in order. TEST CONDITIONS - Ensure vehicle or machine load is not excessive. - Tyre sizes and pressures are as recommended. - The road wheels rotate freely and no brakes are binding. - Ensure axle drive ratios are to correct specification. - The clutch or free-wheeling system is functioning correctly. - Consider accessories fitted (wind resistance with vehicles). STOP CONTROL Ensure it is in the fully "run" position. STICKING ENGINE SPEED CONTROL OR ITS RESTRICTED MOVEMENT Check that all engine speed control linkages are free and that maximum movement is achieved. RESTRICTION IN THE INDUCTION SYSTEM Check air cleaner/element condition. Check for dents or kinks in the hoses and pipes and examine the induction manifold for any obstructions. AIR IN THE FUEL SYSTEM, RESTRICTED FUEL FEED PIPE, CHOKED FUEL FILTERS OR BLOCKED FUEL TANK VENT Refer to the section "Engine is difficult to start". DEFECTIVE FUEL LIFT PUMP Remove outlet pipe and check there is sufficient fuel available from the lift pump. If in doubt replace the unit. INCORRECT FUEL INJECTION PUMP TIMING OR INCORRECT VALVE TIMING Check all aspects of fuel pump and valve timing according to the relevant Service Literature. EXHAUST SYSTEM RESTRICTION Examine the complete exhaust system, checking for dents or kinks in the pipes, check for broken mufflers. POOR BOOST PRESSURE (where turbocharger is fitted) Check turbocharger for: - excessive air inlet depression - all induction pipes and joints are in order - restricted exhaust from turbine - low or high air delivery pressure - low oil pressure and/or poor oil drain - fuel injection pump fuelling. On boost controlled engines, ensure there are no leaks on the pipe from induction manifold to fuel pump. See relevant Service Literature. DEFECTIVE OR INCORRECT TYPE ATOMISERS DEFECTIVE OR INCORRECT TYPE FUEL INJECTION PUMP Check that the correct part number is fitted. Remove the equipment to the specialised fuel injection workshop for checking and servicing. INCORRECT VALVE TIP CLEARANCES See relevant Service Literature for correct valve tip clearances. POOR COMPRESSIONS Refer to the "POOR COMPRESSION" section. |
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| EXCESSIVE FUEL CONSUMPTION |
| FUEL LEAKS With the engine stopped, check the low-pressure fuel pipes for leaks and rectify. Effect a fuel consumption test to confirm the complaint ensuring that the test conditions are in order as in section "Lack of power". DILUTION OF THE LUBRICATING OIL BY FUEL OIL A cold running engine can cause solid fuel to wash down the cylinder bores. A defective lift pump diaphragm can allow fuel to leak into the engine sump (pan). Faulty seals on the drive shaft of the fuel injection pump may allow fuel oil to drain into the engine timing case or auxiliary drive and then into the lubricating oil. RESTRICTION IN THE INDUCTION SYSTEM Check air cleaner/element condition. Check for dents or kinks in the hoses or pipes and examine the induction manifold for any obstructions. STICKING VALVES OR INCORRECT VALVE TIP CLEARANCES Refer to the relevant Service Literature to check valve spring length at a known load. Adjust valve tip clearances. DEFECTIVE COLD STARTING AID (THERMOSTART) Check that the Thermostart is not leaking fuel into the induction manifold during normal operating conditions - see section "Cold engine will not start". INCORRECT FUEL INJECTION PUMP TIMING OR INCORRECT VALVE TIMING Check all aspects of fuel pump and valve timing according to the relevant Service Literature. DEFECTIVE OR INCORRECT TYPE ATOMISERS DEFECTIVE OR INCORRECT TYPE FUEL INJECTION PUMP Check that the correct part number is fitted. Remove the equipment to the specialised fuel injection workshop for checking and servicing. POOR COMPRESSIONS Refer to the section "POOR COMPRESSION". |
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| BLACK EXHAUST |
| Confirm the complaint by a road test,
ensuring that the engine reaches normal operating temperature and
that the test conditions are in order as in the section "Lack
of power".
RESTRICTION IN THE INDUCTION MANIFOLD POOR BOOST PRESSURE (where turbocharger is fitted) Check turbocharger for: - excessive air inlet depression - all induction pipes and joints are in order - low air delivery pressure - restricted exhaust from turbine - fuel injection pump fuelling - low oil pressure and/or poor oil drain See relevant Service Literature. EXHAUST SYSTEM RESTRICTION Examine the complete exhaust system checking for dents or kinks in the pipes, check for broken mufflers. DEFECTIVE "THERMOSTART" (COLD STARTING AID) Check that the "Thermostart" is not leaking fuel into the induction manifold during normal operating conditions. DEFECTIVE OR INCORRECT ATOMISERS DEFECTIVE OR INCORRECT FUEL INJECTION PUMP Check that the correct part number is fitted. Remove the equipment to the specialised fuel injection workshop for checking and servicing. INCORRECT FUEL INJECTION PUMP TIMING OR INCORRECT VALVE TIMING Check all aspects of fuel pump and valve timing according to the relevant Service Literature. INCORRECT VALVE TIP CLEARANCES Adjust valve tip clearances according to the relevant Service Literature. POOR COMPRESSIONS Refer to the section "POOR COMPRESSION". |
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| ENGINE KNOCKING |
| INCORRECT TYPE OR GRADE OF
FUEL Check that the fuel being used is to the correct specifications. See relevant Service Literature. DEFECTIVE OR INCORRECT TYPE OF ATOMISERS Determine the knock is a faulty atomiser or not. Slacken off the high-pressure pipe of each atomiser in turn to eliminate "knocking" whilst running engine at high idle. If the knock ceases on the slackening off of a particular atomiser fuel pipe then that atomiser is probably faulty. BROKEN VALVE SPRING/S STICKING VALVES INCORRECT VALVE TIP CLEARANCES Refer to the relevant Service Literature to check valve spring length at a given load. Adjust valve tip clearances. INCORRECT FUEL PUMP TIMING OR INCORRECT VALVE TIMING Check all aspects of fuel pump and valve timing according to the relevant Service Literature. INCORRECT PISTON HEIGHT Remove cylinder head, check for any damage and check the height of the pistons when at T.D.C. relative to the top of the cylinder block. See the relevant Service Literature. BROKEN, WORN OR STICKING PISTON RINGS PISTON "PICK-UP", BEGINNING TO SEIZE WORN CYLINDER BORES Repair engine. WORN OR DAMAGED BEARINGS GUDGEON (WRIST) PIN BEARING WORN Repair engine. CAMSHAFT END FLOAT EXCESSIVE Repair engine. KNOCK OR RATTLE, POSSIBLY EXCESSIVE BACKLASH ON TIMING GEARS Repair engine. |
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| BLUE/WHITE EXHAUST |
| NOTE: CONFIRM COMPLAINT BY ROAD TEST, ENSURING ENGINE REACHES NORMAL OPERATING TEMPERATURE INCORRECT GRADE OF LUBRICATING OIL Ensure that the oil being used is of the correct specification, i.e. (spec: MIL-L-2104C or MIL-L-46152). FAULTY COLD START EQUIPMENT Check for leaking cold start unit. Check that excess fuel device is not permanently engaged (in line pumps only). RESTRICTION IN THE INDUCTION SYSTEM Check air cleaner, re-new if dirty. Ensure that no restriction is possible in induction piping. INCORRECT FUEL PUMP OR VALVE TIMING Check timing according to relevant Service Literature. COLD RUNNING Check coolant temperature/thermostat. WORN OR DAMAGED VALVE STEM OIL DEFLECTORS, VALVE GUIDES OR VALVE STEMS Remove cylinder head and check, replace with new parts as necessary. POOR COMPRESSION Refer to the section "POOR COMPRESSION". "BLOWN" OR LEADING CYLINDER HEAD GASKET PISTON "PICKING UP" BEGINNING TO SEIZE BROKEN, WORN OR STICKING PISTON RINGS WORN CYLINDER BORES Repair engine. |
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| EXCESSIVE LUBRICATING OIL CONSUMPTION |
| OIL LEAKS Examine for leaks with the engine under normal operating conditions and rectify where necessary. NEW OR REBUILT ENGINES NOT FULLY BEDDED IN Allow time for new piston rings to become bedded into the cylinder liners. The amount of time to allow will depend upon the way the engine is used and the conditions under which it is operating. INCORRECT VISCOSITY OIL, DILUTED OR INFERIOR OIL Drain the oil and refill with the engine manufacturer's recommended grade and viscosity of oil to comply with the machine's ambient and working conditions. Change the oil filter element. OIL LEVEL TOO HIGH (Can also cause overheating) Check for improper practices of checking the oil level, i.e. engine cold, drain-down time and engine/machine standing level. If the complaint persists, check that the dipstick and tube are of the correct part number. ENGINE NOT BREATHING Check all breather pipes and any breather oil strainers and oil return pipes in the breather system. COMMUNICATION BETWEEN OIL FEED PIPE AND FUEL OIL PIPE Check very carefully the rubbing spot of any chafing pipes. Lubricating oil under pressure can flow from its own pipe into a fuel pipe with a lower pressure through the smallest of pinholes. OIL CARRY-OVER BY ANCILLARY EQUIPMENT Oil carry-over by an air compressor can usually be indicated by an unusual amount of oil draining from the air reservoir. FAULTY OIL COOLERS Any leak from the oil pressure side into the coolant can usually be detected by the presence of oil in the coolant. CONSUMPTION BY THE FUEL INJECTION PUMP This would normally be expected to show itself in some other form, such as engine performance or exhaust condition. BLOCKED INDUCTION SYSTEM Check air cleaner/element and induction pipework for restriction. GLAZED BORES May be the result of long idling periods - deglaze bores and re-ring pistons. WORN, BROKEN OR STUCK PISTON RINGS WORN PISTONS AND CYLINDER BORES WORN VALVE GUIDE BORES WORN VALVE STEM SEALS Dismantle and repair, inspecting for causes of the conditions found. |
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| POOR COMPRESSION |
| RESTRICTION IN THE INDUCTION
SYSTEM Check air cleaner/element, re-new if dirty. Ensure that no restriction is possible in induction piping and manifold. STICKING VALVE/S, BROKEN VALVE SPRING/S OR INCORRECT VALVE TIP CLEARANCES Check re-set valve tip clearances as necessary. INCORRECT VALVE TIMING Check timing as instructed in relevant Service Literature. IF COMPRESSION FIGURES SHOW A PARTICULARLY LOW FIGURE ON ONE CYLINER, THEN THE MOST LIKELY CAUSE IS A CYLINDER HEAD GASKET LEAKING OR POOR VALVE SEATING Remove cylinder head and check gasket, valves, seats and guides. Fit new parts as necessary. PITTED VALVES AND SEATS WORN VALVE STEMS AND GUIDES Remove cylinder head and check gasket, valves, seats and guides. Fit new parts as necessary. INCORRECT PISTON HEIGHTS Check piston heights, ensure that tolerance is within specification. BROKEN, WORN OR STICKING PISTON RINGS WORN CYLINDER BORES Repair engine. |
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| OVERHEATING |
| Check that the machine or vehicle is
not being overloaded. Check that any temperature gauge fitted to the machine is not faulty, by removing the radiator pressure cap, run the engine until coolant warms up and using a thermometer in the radiator compare its reading to that of the gauge fitted to the machine. COOLANT LEVEL TOO LOW LUBRICATING OIL LEVEL TOO HIGH With engine cold check the level of the coolant. Check for leaks. Check for improper practices of checking the oil level. Level engine/machine and allow drain-down time. LOOSE FAN BELT DEFECTIVE WATER PUMP Check there is about 3/8in (10mm) depression on the longest run of the belt(s) by normal hand pressure. With radiator cap removed and the thermostat removed, check there is a swirl of coolant in the header tank. With remote tanks, remove the thermostat from a cold engine, momentarily start the engine when coolant should be pushed out by the water pump, from the thermostat housing. CHOKED, DEFECTIVE OR INCORRECT RADIATOR, HOSES OR PRESSURE CAP Back-flush the cooling system with pressurised water. Remove all hoses for inspection. Check the radiator and pressure cap part number and its operation with the manufacturer's spec. Ensure the air flow through the radiator is not impeded. FAULTY THERMOSTAT Check that the thermostat opens at the correct temperature and it is the correct part number. RESTRICTION IN THE INDUCTION MANIFOLD Check air cleaner/element condition. Check for dents or kinks in the hoses or pipes and examine the induction manifold for any obstruction. DEFECTIVE THERMOSTART Check that the thermostart is not leaking fuel into the induction manifold under normal operating conditions. EXHAUST SYSTEM RESTRICTION Examine the complete exhaust system for dents or kinks in the pipes and check for any damage to the mufflers. CYLINDER HEAD GASKET LEAKING OR CRACKED CYLINDER HEAD This can sometimes be detected by bubbles in coolant and by comparing cylinder pressures. Remove cylinder head for inspection or replacement. INCORRECT FUEL INJECTION PUMP TIMING OR INCORRECT VALVE TIMING Check all aspects of fuel pump and valve timing according to the relevant Service Literature. DEFECTIVE OR INCORRECT TYPE ATOMISERS OR FUEL PUMP Check for correct part number and arrange for testing in specialised workshop. PISTON PICK-UP BEGINNING TO SEIZE Repair engine. |
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| EXCESSIVE CRANKCASE PRESSURE |
| NOTE: IT IS ASSUMED THAT ON A COMPLAINT OF THIS NATURE, OIL IS BEING BLOWN OUT EXTERNALLY, i.e. OUT OF DIPSTICK TUBE, etc. CHOKED BREATHER OR PIPE Remove the engine breather and pipe and check for restriction. Rectify as necessary. DEFECTIVE EXHAUSTER (if fitted) Ensure that there are no leaks in the vacuum system or exhauster, as this would permit air to enter the engine causing crankcase pressure. PISTON PICK-UP BEGINNING TO SEIZE WORN CYLINDER BORES BROKEN, WORN OR STICKING PISTON RINGS CYLINDER HEAD GASKET LEAKING Repair engine. |
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| ERRATIC RUNNING |
| ENSURE THAT THE ENGINE IS OPERATING AT
THE CORRECT TEMPERATURE See section "OVERHEATING" DEFECTIVE STOP CONTROL OPERATION, STICKING THROTTLE OR RESTRICTED MOVEMENT Ensure that the operation of these is free, and are not fouling in any way. RESTRICTION IN THE INDUCTION SYSTEM Check air cleaner element, re-new if dirty. Ensure that no restriction is possible in induction piping and manifold. AIR IN THE FUEL SYSTEM Bleed fuel system as instructed in relevant Service Literature. INCORRECT TYPE OR CROSSED HIGH PRESSURE PIPES Ensure that these are of the correct type and are fitted in the correct firing order. BLOCKED FUEL TANK VENT RESTRICTED FUEL FEED PIPE CHOKED FUEL FILTER Check and rectify as in section "ENGINE IS DIFFICULT TO START". DEFECTIVE FUEL LIFT PUMP Check lift pump operation, if insufficient fuel flow is evident, remove lift pump and rectify or fit replacement. STICKING VALVE/S, BROKEN VALVE SPRING/S OR INCORRECT VALVE TIP CLEARANCE Check, reset valve tip clearance as necessary. INCORRECT FUEL PUMP OR VALVE TIMING Check all aspects of fuel pump and valve timing according to the relevant Service Literature. DEFECTIVE ATOMISERS OR INCORRECT TYPE DEFECTIVE FUEL INJECTION PUMP Check that the correct part number is fitted. Remove the equipment to the specialised fuel injection workshop for testing and servicing. POOR COMPRESSION Refer to the section "POOR COMPRESSION". |
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| VIBRATION |
| STICKING THROTTLE OR RESTRICTED
MOVEMENT Ensure that the operation of the throttle is free and not fouling in any way. FAULTY ENGINE MOUNTING/S OR HOUSING Check that the engine mountings and feet are not loose or perished. Ensure that the flywheel housing is not faulty or cracked, etc. DAMAGED FAN OR INSECURE CRANK SHAFT PULLEY Check for damaged fan or fan blades, i.e. broken, bent or cracked. Ensure that Crank Shaft pulley and fan are correctly torqued. INCORRECT OR CROSSED HIGH PRESSURE PIPES Ensure that these are of the correct type and are fitted in the correct firing order. STICKING VALVES Remove rocker cover and check that the operation of the valves is free. INCORRECTLY ALIGNED OR LOOSE FLYWHEEL OR HOUSING Check tightness of flywheel housing and with a clock gauge check that the alignment of the flywheel and housing are within limits. Refer to relevant Service Literature. POOR COMPRESSION Refer to the section "POOR COMPRESSION". |
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| LOW OIL PRESSURE |
| INSUFFICIENT OIL IN SUMP Ensure that there is sufficient oil in the sump and that the correct type and grade is being used. LUBRICATING OIL NEEDS CHANGING (DIRTY, SLUDGED OR DILUTED) If oil dirty; change oil and filter. If oil sludged; drain oil and clean engine with flushing oil. Refill with recommended oil and change filter. If oil diluted; then trace cause: If diluted by diesel fuel, rectify as in section "EXCESSIVE FUEL CONSUMPTION". If diluted by water, possible causes: - Defective oil cooler (if fitted) - Cylinder head gasket leaking - Porous cylinder block Check and rectify as necessary and change oil and filter. INACCURATE GAUGE OR WARNING LIGHT Check engine oil pressure by connecting a master gauge in place of the oil pressure sender unit or oil pressure switch and run engine. If oil pressure OK; then replace with new oil pressure gauge or warning light switch. If oil pressure too low; then remove sump and check that the sump strainer is clear, by: Checking suction pipe for cracks or bad joint to the oil pump. Removing and checking relief valve operation. Removing and checking oil pump for wear. RESTRICTED SUMP STRAINER DEFECTIVE SUCTION PIPE DEFECTIVE PRESSURE RELIEF VALVE WORN OIL PUMP Remove sump and check that the sump strainer is clear; by: Checking suction pipe for cracks or bad joint to the oil pump. Removing and checking relief valve operation. Removing and checking oil pump for wear. WORN OR DAMAGED BEARINGS Repair engine. |
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| HIGH OIL PRESSURE |
| INCORRECT TYPE OR GRADE OF LUBRICATING
OIL Check with customer, ensure that the correct type and grade of lubricating oil is being used. INACCURATE OIL PRESSURE GAUGE Check accuracy of oil pressure gauge by connecting a master gauge in place of the original. If oil pressure too high; then remove and check pressure relief valve operation, repair as necessary or fit a new replacement. If oil pressure normal; then replace with new oil pressure gauge. OIL PRESSURE RELIEF VALVE STUCK (CLOSED) Remove and check pressure relief valve operation, repair as necessary or fit a new replacement. |
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