Diesel Engine Engine Testing
92
Fuel System
Checking and Adjusting Fuel
Injection Timing
There are two methods for checking and adjusting the
fuel injection timing of an injection pump.
• The “MATCH MARK ALIGNMENT” method,
which is used when the injection pump is
installed on the original engine and the pump is
not being repaired.
• The “MEASURING DEVICE” method, which is
used when a repaired or replaced injection
pump is installed on the engine.
Checking and Adjusting with the Match Mark
Alignment Method
NOTE: Set the No. 1 cylinder at compression top
dead center (TDC) by aligning the pointer
on the gear cover with the TDC line on the
crankshaft pulley. Confirm that the mark “C”
can be seen on the idler gear. If the mark
“C” can not be seen, rotate the crankshaft
one complete revolution and confirm that
“C” can be seen.
NOTE: Align the match mark “C” on the injection
pump gear with the match mark “C” on the
idler gear during installation for correct
alignment. Align the stamped line “a” on the
injection pump with the stamped line “b” on
the timing gear case during installation for
correct alignment.
Install the injection pump.
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