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SOURCES OF ENGINE NOISE
SOURCES OF ENGINE NOISE
1) MISFIRING or BACKFIRING.
POSSIBLE CAUSES.
- Fuel in tank has wrong octane/cetane number, or is wrong type of fuel.
- Ignition system faulty.
- Engine temperature too high.
- Carbon deposits in the combustion chamber start to glow and cause misfiring.
- Timing incorrect, which causes misfiring in the intake/ exhaust system.
REQUIRED ACTION
- Determine which type of fuel was last put in the tank.
- Check the ignition system
- Check the engine cooling system
- Remove the carbon deposits by using fuel additives and driving the vehicle carefully
- Check the timing
2) VALVE TRAIN FAULTY.
POSSIBLE CAUSES.
- Valve clearance too large due to faulty bucket tappets or incorrect adjustment of valve clearance.
- Valve timing incorrectly adjusted valves and pistons are touching.
- Timing belt broken or damaged.
REQUIRED ACTION
- Adjust valve clearance if possible and
renew faulty bucket tappets – check cam
condition.
- Check the valve timing and adjust if necessary.
- Check timing belt and check pistons and
valves for damage – renew any faulty parts.
3) FAULTY ENGINE COMPONENTS.
POSSIBLE CAUSES.
- Pistons.
- Piston rings.
- Cylinder head gasket.
- Big-end and/or main bearing journals.
REQUIRED ACTION.
- Disassemble the engine and check
components.
4) ANCILLARY COMPONENTS
POSSIBLE CAUSES
- Engine components or ancillary components loose or broken.
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