68
(IV) Underpower of Diesel Engine
Fault Characteristics & Causes
Elimination Approaches
1. Element of air filter is clogged.
1. Clean the element or replace it if
necessary.
2. Intercooler is too dirty.
2. Clean away the oil stain inside the cooler
as well as impurities and dust outside.
3. Air leaks from the pipes of intercooler.
3. Tighten the connections of the pipe or
replace.
4. Exhaust manifold or main pipe is clogged.
4. Remove the foreign matters in the pipe.
5. Air leaks from exhaust manifold or main pipe.
5. Tighten the connecting screws or replace.
6. Air exists in fuel pipeline.
6. Exhaust the
air and tighten the
connections of the pipe.
7. Oil reserve in the tank is insufficient and the oil used
is of poor quality.
7. Fill up fuel to the tank; select the fuel in
accordance with the requirement.
8. Injection pump piston or delivery valve seat thereof
malfunctioned; or the connecting nut of high-pressure
oil pipe is loose.
8. Tighten or adjust.
9. Advance angle of fuel supply is improper.
9. Adjust the angle.
10. Injector has bad atomization.
10. Adjust the injection pressure.
11. Valve clearance is improper.
11. Adjust the clearance.
