MAINTENANCE MANUAL OF ENGINE
134
5. Calibration of the fuel injection pump
Cause:
The fuel supply to the individual cylinders is
non-uniform, and the fuel injection pressure is in-
sufficient.
Equipment:
Fuel pump test bench
Testing steps:
1. Install the fuel injection pump onto the test
bench, connect the standard fuel injector, and then
turn the fuel pump to pump fuel.
2. If fuel delivery unevenness of cylinders is
too serious, it is possible to turn the plunger to ad-
just the fuel delivery.
3. Turning the plunger in clockwise direction
can make the fuel quantity decreased, and increases
in counterclockwise direction until the delivery un-
evenness of cylinders reaches the specified re-
quirement.
Specification:
Delivery unevenness of cylinders: Nominal:
10%; Calibration: 10%; Idling speed: 30%.
Test results:
If the delivery unevenness of cylinders has no
problem, it is possible to take account of other fac-
tors.
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