EM-8
ENGINE MECHANICAL
-
Troubleshooting (Diesel Engine ~iagnosis)
ROUGH IDLE WITH WARM ENGINE
(Possible Cause)
(Check Procedure and Correction Method)
1. IMPROPER ADJUSTMENT OF
ACCELERATOR CABLE
I
5. IMPROPER OPERATION OF
INJECTION NOZZLES OR
DELIVERY VALVES
With accelerator pedal released, check that adjusting
lever
is
in contact with idle speed adjusting screw.
Also check if accelerator cable or linkage
is
catching
on something.
If necessary, adjust so that lever
is
in contact with
screw, or make other required repairs.
3. FUEL LEAKAGE
Refer to step
7
of ENGINE CRANKS NORMALLY
BUT
WILL NOT START, above.
I
-
I
2. IDLE SPEED
Check idle speed. (See page EM-27)
Idle speed: 2L-T 700
-
800 rpm
3L 650
-
750 rpm
HINT:
If less than standard, idling would normally
be rough.
If not
as
above, adjust with idle speed adjusting
screw.
Check for leaks
at
injection pump connections, pump
distributive head bolt, injection nozzles and delivery
valve holders.
Tighten any loose connections to specified torque or
replace parts
as
necessary.
With engine idling, loosen injection pipe to each
cylinder in order, and check if idle speed changes.
If no change,
a
faulty cylinder
is
indicated.
Check according to following procedure.
Faulty injection nozzle
Check injection nozzle with
a
nozzle tester.
Opening pressure: 145
-
155 kg/cm2
(2,062
-
2,205 psi)
(14,220
-
15,200 kPa)
If not
as
above, nozzle adjustment
is
improper and
pressure should be readjusted.
If pressure cannot be adjusted to specification, re-
place injection nozzle.
Faulty delivery valve
If injection pressure
is
as
specified, delivery valve
is
defective and should be replaced.
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