Installation Guide

43
18-SG02D1-1A-EN
Common Faults and Repair Methods of Engine
Number Fault Check
5 Sudden Stop 1. Safety fuse burned out (replace)
2. Loss of GND connection (settle)
3. Pressure reducer water cycle emerges ice block
(Handling method: Clear the water cycle)
4. Pressure reducer low-pressure chamber leaks or diaphragm
broken, repair or replace (settle or replace)
5. Air lter is too dirty - check or clean.
6. Solenoid valve fault closed
7. Fault of emergency stop switch
6 Abnormal sound
when the engine is
operating
1. Ignition timing is early and causes detonation;
check distributor timing!
2. Ignition timing is late which causes backring of exhaust
Dealing methods for Item 1 and 2: adjust the ignition timing
on the distributor
3. Tolerance between piston and cylinder is incorrect; it knocks
when starting engine, noise dissipates after warmup of
engine
4. The gap between piston pin and pin hole is too big, sound is
light but clearer during idling
5. The gap between main bearing and connecting rod bearing
is worn, can hear especially at lower speed, it sounds heavy
and strong
6. Lose crankshaft bearing, can hear noise when idling
7. Broken Valve spring, excessive valve clearance, that can be
heard knocking around the cylinder cap
Dealing methods for Item 3, 4, 5, 6 and 7: replace the parts,
insure proper tolerances and gaps.
8. When the piston hits the cylinder head, you can hear the
knocking of metal around the cylinder head
Repair method: check the piston and valve to see if damage
has occurred
7 Temperature of the
engine oil is too
high
1. Check around engine compartment for leaks
2. Too much engine load; Reduce load.
3. Too much or not enough engine oil.
4. Down exhaust is too much
Dealing methods for Item 4: replace the piston ring or the
cylinder sleeve.
5. Blockage in the oil cooler, oil temperature controller valve
opened, the temperature is too high, Radiator intake vent is
blocked by dirt and debris.
6. Oil mark is not correct (oil viscosity is too high )