MAINTENANCE MANUAL OF ENGINE
133
4. Inspecting fuel injection pump timing
Cause:
High fuel consumption rate, poor power perfor-
mance and black smoke.
Equipment:
Special socket or open-end spanner
Testing steps:
1. Remove the air in the fuel system, enable the
crankshaft to be reciprocated to get the oil injection
pump fully filled with diesel fuel, and dismantle the
1st high pressure oil hose to blow out the residual
oil in the fitting hole of the oil valve seat; after that,
slowly turn the crankshaft in forward direction, and
pay a close attention to oil level in the fitting hole;
stop turning the crankshaft immediately when the
oil level fluctuates.
2. Check whether scale on the flywheel scale line
aligned with the marking scale line on the flywheel
cover meets the specified optimal value.
3. If the fuel supply advance angle is too big or
small, it is possible to release the three nuts on the
triangle flange of the oil injection pump. Turning
the fuel injection pump outward can get the fuel
supply advance angle increased, and turning inward
can get the advance angle decreased. Tighten the
three nuts on the mounting flange, and then inspect
the fuel advance angle until it meets the require-
ments.
Specification:
(KM385BT/4L22BT) Fuel supply advance angle:
16°±1°
(KM385T/4L22T) Fuel supply advance angle:
10°±1°
Test results:
If the timing of the fuel injector has no prob-
lem, it is possible to take account of other factors.
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