Common Faults and Solutions for Air-Cooled Engines 6

fault cause

Solution

Belt squealing due to insufficient tension or excessive load

Check and adjust belt tension and verify that all pulleys turn freely.

Air leakage between turbocharger and cylinder head

Tighten the clamp between the turbocharger and the cylinder head, and repair the leak at the connection between the turbocharger and the cylinder head.

Exhaust pipe leakage

Refer to the black smoke exhaust fault analysis symptom tree.

Turbocharger does not rotate freely

Replace the turbocharger.

The backlash of the gear train is not adjusted correctly

Adjust the backlash in the gear train.

Damaged or missing idler bushing

Replace the idler bushing.

The fuel injector is defective or clogged

Replace defective or clogged injectors.

Improper adjustment of the overhead mechanism

Measure and adjust the overhead mechanism settings.

Damage to overhead mechanism components

Check the rocker arms, rocker shafts and valves for severe damage.

Injection pump incorrectly adjusted

Adjust or replace the fuel injection pump.

Wear of piston ring or cylinder causes compression pressure to drop

Replace worn piston rings or cylinders.

fault cause

Solution

The engine mounting bolts are loose or the engine mounting shock absorber pads are damaged

Replace engine mounting bolts or shock pads.

Bad connection between engine and main oil pump

Check and adjust.

Incorrect backlash adjustment of the gear train

Adjust the gear train backlash.

Damage to overhead mechanism components

Check whether the rocker arm, rocker arm shaft and valve are seriously damaged, and replace the rocker arm, rocker arm shaft and valve if necessary.

Camshaft sleeve wear

Replace the camshaft sleeve.

Injection pump incorrectly adjusted

Adjust or replace the fuel injection pump.

Fuel injector malfunction

Correct or replace.

The main bearing or connecting rod is worn or damaged

Replace the connecting rod or main bearing.