Table 4-1.--Diesel Engine Troubleshooting Chart--Continued
TROUBLE
PROBABLE CAUSE
REMEDY
Exhaust smoke black-gray-- Lube oil entering combustion cham- Test lube system pressure.
Continued.
bers.
Test compression to isolate faulty
cylinder(s).
Torque cylinder head bolts to seal
head gasket.
Test air box pressure.
Replace engine. (Refer to QEC in-
structions.)
Excess fuel or timing wrong.
Conduct tune-up.
Wrong fuel.
Drain fuel tanks and add specified
fuel.
Exhaust smoke blue.
Blower oil seal leak.
Remove air inlet housing. Check
seal areas with engine running.
Service blower is seal leaking.
Test compression.
Piston rings leaking lube oil.
Replace engine. (Refer to QEC in-
structions.)
Exhaust smoke white.
Misfiring cylinder(s).
Repair injectors.
High oil consumption.
External leaks.
Tighten engine mounted compo-
nents:
Oil pan.
Fuel pump.
Air compressor.
Oil cooler.
Blower.
Rocker arm cover.
Tighten piping and external com-
ponents:
Filter components.
Oil pan to sump hose.
High crankcase pressure.
Test crankcase pressure.
Cylinder blowby.
Replace engine. (Refer to QEC in-
structions.)
Air from blower.
Correct blower to block gasket
leak.
4-45
