ENGINE DIVISION SERVICE MANUAL
plunger into the cylinder (do not install the plunger
spring) with the other. Depress the plunger with your
finger and release quickly. The plunger is now
operating against air which is sealed in by the check
valve and by the close fit of the cylinder to the
plunger. It should yield slightly to the pressure of the
finger on the plunger, but the plunger should kick-
back upon release of the pressure. If no kick-back of
the plunger occurs, the unit may or may not be
defective. The lack of kick-back is due to one of
First, air is escaping past the check valve because of
presence of dirt which prevents proper seating of the
valve. Second, air is escaping past the check valve
because of a damaged seat. Third, air is escaping
because the clearance between the plunger and
cylinder wall is too great, which indicates excessive
Rewash the unit to eliminate any dirt which might still
be on the check valve seat and repeat the test. If
there is still no kickback, the check valve is damaged
and the entire lifter, consisting of cylinder body and
plunger, may need to be discarded.
In the event check valve leakage is
encountered due to wear on the surface of
the check valve, the valve can be turned
over to the unworn side. This procedure
will extend the useful service life of the
lifter assembly, provided all other parts of
the lifter are in good condition.
In the above test procedure it is important that the
pressure on the plunger be released immediately
after it is depressed. If the plunger is held down too
long, all the air trapped under the plunger will leak
out and the test would be inaccurate.
The unit is suitable for reinstallation in the engine if
the test is satisfactory.
Wash and clean the crankshaft with cleaning solvent
Inspect the crankshaft for cracks, scored, grooved or
worn main bearing and ' connecting rod journals. If journals
show wear or out-of-round in excess of .002", the shaft should
be reground and undersize bearings installed or the
crankshaft replaced. Use a micrometer for checking.
Examine the crankshaft timing gear teeth and replace
the gears if the teeth are worn or damaged.
Replace the timing gear on the camshaft
when replacing the crankshaft gear. These
gears are serviced in matched sets.
Wash the camshaft in cleaning solvent and remove
all sludge or carbon deposits with a soft brush.
Inspect the camshaft journals for signs of wear or
out-of-round and replace if wear warrants. See ENGINE
OVERHAUL Cylinder Block.
Inspect the camshaft lobes. If worn, chipped or
scored, replace the camshaft.
Inspect the distributor drive gear and camshaft gear
and replace if wear warrants or the gear teeth are nicked or
Inspect the fuel pump cam. If worn, chipped or
scored, replace the cam.
If the distributor drive gear, fuel pump cam
and camshaft gear were removed without
complete engine disassembly, they may
be reinstalled as follows:
Install distributor drive gear against thrust flange on
camshaft using SE-1900-14 sleeve with SE1900-16
adapter, Figure 123. A thrust bearing is also used
under the forcing screw nut to reduce friction.
Use extreme caution so as not to chip the
distributor gear teeth.
CGES-210 Page 48
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