Engine Maintenance
79
2. Remove the filter, cover and cover gasket.
Wash the filter in cleaning solvent and blow
out the dirt and cleaning solvent with
compressed air. Check the cover gasket and
replace if damaged. Clean the cover.
If pump does not operate, check for:
1. The ground to the frame of the unit.
2. Clean and tighten electrical connections.
3. The pump voltage and polarity. It must be the
same as the unit system.
If pump operates but does not deliver fuel,
check for:
1. Air leaks in the fuel lines or connections.
2. Kinked fuel lines or other restrictions in the
line.
3. A leaking or distorted cover gasket.
4. A dirty filter.
5. A stuck seat in the outlet fitting.
Injection Pump
Injection Pump Adjustments
When the diesel engine fails to maintain the
correct engine speed, check the following before
adjusting the speed:
1. Check the prefilter screen. Recheck the speed.
2. Bleed air out of the fuel system. Recheck the
speed.
3. Bleed air out of the nozzles. Recheck the
speed.
4. Operation of electric transfer pump.
Make the engine speed adjustments with the
engine fully warmed up.
The unit has one solenoid to control the high
speed function. The speed of the engine should be
checked with the use of a stroboscope tachometer
(see Tool Catalog).
Timing the Injection Pump to the Engine
There are two different types of timing procedures
used on the engine. One procedure involves
checking to make sure the cylinders are timed
correctly to each other, and the second procedure
times the injection pump correctly to the engine.
If the cylinders are not timed correctly to each
other, it is of no value to time the injection pump
to the engine because one or two of the three
cylinders would be out of time. The individual
plungers in the injection pump are timed to each
other by the use of spacers in the pump plunger
base. It is rare that an injection pump would
change individual cylinder timing unless it had
been through some type of repair process, but if
all other possible problems with a rough running
engine have been checked, and especially if the
engine’s injection pump has been replaced or
repaired recently, it may be beneficial to check
individual cylinder timing. Because the possibility
of incorrect individual cylinder timing is so
minimal, the procedure for timing the pump to the
engine will be covered first. The procedure for
individual cylinder timing is very similar to
timing the injection pump so it will be covered
last.
CAUTION: The cylinders on the engine
are numbered from the flywheel end to the
water pump end. The number 1 cylinder is
next to the flywheel. The number 2
cylinder is the center cylinder. The
number 3 cylinder is next to the water
pump. The timing marks on the flywheel
are matched to this system.
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