Troubleshoot Diesel Engine Temperature, Injection and Governor

by Generator D. Diesel Generator

This is the part II of Yuchai YC4108D/YC4108ZD diesel engine troubles and troubleshooting. It contains the examples of normal troubles that users will encounter during operating diesel engine and many remedies are provided to different troubles. The problems include high oil pressure, much diluted oil, excessive oil consumption, high water outlet temperature, engines stop automatically, engine over-speeding and other troubles like injection and governor.

I. Too High Oil Pressure, Much Diluted Oil, Excessive Oil Consumption

Possible causes	Remedies
1.Too high diesel engine load	Be careful not to pull out the lead seal on the injection to avoid engine operating forepart，which will damage the engine forepart.
2. ncorrect engine oil grade	Select oil according to the brand prescription.
3. Piston ring stuck or seriously worn causing gas blow - by and oil pumping - up.	Dismantle, check and clean the piston an piston ring, replace the piston ring and cylinder sleeve if necessary.
4. Oil groove and bore of piston and piston ring clog.	Dismantle and clean, and then re-install it.
5. Oil cooling plug clog	Clean,replace if necessary.
6. Diluted oil due to diesel or water in it	Check the cylinder sleeve seal ring, oil cooler, injection pump, injector, cylinder head, and cylinder head washer, replace them if necessary.

II. Too High Water Outlet Temperature

Possible causes	Remedies
1. Insufficient cooling water or too small water flow	Check the level of cooling water, add water to adequacy if necessary; check for looseness of the belt, adjust it if necessary; check for leakage of the water pump, repair it in time if necessary; check and replace the damaged thermostat.
2. Too much scale in water passage and tank	Clear it．
3. Thermostat failure	Check and replace the damaged thermostat
4. Water temperature indicator damaged and transmitter failure.	Check and compare the actual temperature with the indication, if they are not same, replace the transmitter or water temperature indicator.
5. Cooling fan damage	Repair or replace．
6. Water pump damage	Repair or replace.