79
Fault Characteristics & Causes
Elimination Approaches
1. Oil pressure is too low.
a) Oil pan is short of oil.
b) Oil passage is clogged.
c) Oil filter is clogged.
d) Diesel engine is overheated so that the oil
temperature is too high and the oil is thinned.
a) Oil to the marking line on the dipstick.
b) Clean the oil passage and blow off by
compressed air.
c) Clean the oil filter or replace the filter
element.
d) Reduce the load, replace the oil and lower
the oil temperature.
2. The oil is of poor quality.
2. Replace with the oil in conformity with the
requirement.
3. Spill valve of oil filter is sticking or has excessive
oil return.
3. Repair or replace the oil filter.
4. Oil pump screen is clogged.
4. Clean the screen.
5. Oil pump gear is worn or the end clearance is too
large.
5. Adjust or replace the gear.
6. Oil pipe is broken or the joint gets loose.
6. Tighten the joint.
7. Oil pump malfunctioned.
7. Repair or replace the oil pump.
