Troubleshooting; Diesel Engine Diagnosis - Toyota 1HD-FT Repair Manual

EG-6
Thermometer
Torque wrench
Valve seat cutter
V-block
Vernier calipers
ENGINE - ENGINE MECHANICAL
SSM (SERVICE SPECIAL MATERIALS)
08826-00080
Seal Paeking Black or equivalent
Timing belt cover
(FIPG) Timing gear cove.
Camshaft oil sell reUlinar
Cylinder he.d lemi-circyla. plug
08826
00080 Seal Packing Black or equivel'nt Cylinder hflld cover
(FIPGj Main bearing cover
R... oil
leal
retainer
08826-00100 Seal Packing 12828. Water temperature sender gauge
THREE BONO 12828
or
equivalerlt
(FIPGI
TROUBLESHOOTING
_-0'
Diesel Engine Diagnosis
GENERAL
1. Diesel engine problems are usually caused by the engine or fuel system. The injection pump is
very rarely the cause of fuel system problems.
2. Before beginning fuel system tests, first check that the engine compression. valve timing and
other major systems are within specifications.
PRELIMINARY CHECKS
1. Before performing fuel system checks, ensure that the engine is in good running condition. If
necessary, first check the compression. timing and major components or systems.
2. Check the air filter, and clean or replace it if necessary.
3. Check that there is sufficient fuel in the tank.
4. Check if the fuel is contaminated with gasoline or other foreign elements. Only good-quality
diesel fuel should be used.
5. Bleed air from the system by pumping the priming.
6. Check for water in the fuel filter and fuel tank. and drain as necessary.
7. If the engine will not crank or if it cranks slowly, first troubleshoot the electrical system.