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Motor makes strange noises.

 

Diesel knock.

Diesel knock is a vibration that is caused by too rapid pressure increase during combustion, especially cold diesels suffer from a diesel knock and as the engine gets warmer, the diesel knock will decrease. Excessive diesel knock can be caused by: Faulty injector (s), including dripping from the injector and a wrong atomizing image. Faulty injection pump, delivery valves faulty, piston (s) worn. Fuel; cetane number too low, water in the fuel, air in the fuel. Motor; compression too low or a defective pre-heating system.

 

Constant tap.

Valve clearance of one or more valves is too great or there are one or more burnt valves.

 

Rattling noise at the clutch.

There is a damper plate between the engine and gearbox. This special plate with springs or plastic cams is mounted on the flywheel and serves to dampen torsional vibrations from the engine (especially at low revs) and to slightly absorb the impact of engaging the gearbox. If a rattling noise (which was not there before) apparently comes from the clutch housing at low revs, this usually indicates a worn damper plate and not a faulty gearbox. Loose or broken springs are causing the noise. For a trained ear it is possible to determine whether it is a defective damper plate or the “hammering” of a worn gearbox. As the clutch heats up, the sound will change. Not if the damper plate is defective!

 

Irregular shaking and banging.

Worn or wrong engine mounts. Motor not properly aligned with propeller shaft. Idle speed too low.

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