4.1 Oil Pump
DETROIT DIESEL 53
Fig.2. Installing Oil Pump Drive Gear
Fig. 6. - Removing Oil Pump Drive Gear
fit (slip torque) be checked with tool J 23126. On 6V
engines, the drive gear should not slip on the crankshaft
pump body. Since the holes are offset, the cover plate
can be installed in only one position.
CAUTION: Do not exceed these
Install two new drive screws to hold the
If the gear slips on the
shaft, it is suggested that another oil
pump drive gear be installed.
Remove Pump Drive Gear From Crankshaft
Install Oil Pump
With the lower engine front cover and the lubricating oil
pump removed from the engine, the oil pump drive gear
The markings on the pump body indicate the
may, if necessary, be removed from the end of the
installation as pertaining to left or right-hand crankshaft
crankshaft as follows:
rotation. Be sure that the letters "UP R.H." (right-hand
rotation engine) on the pump body are at the top (Fig.
Thread the crankshaft pulley retaining bolt in the
end of the crankshaft (Fig.6L.
Insert the six bolts with lock washers (if used)
Attach the jaws of a suitable gear puller behind
through the pump body and thread them into the engine
the gear and locate the end of the puller screw in the
front cover. Tighten the bolts to 13-17 lb-ft torque.
center of the pulley retaining bolt.
Turn the puller screw clockwise to remove the
gear from the crankshaft.
Install Pump Drive Gear on Crankshaft
Lubricate the inside diameter of a new oil pump
drive gear with engine oil. Then start the gear straight
on the crankshaft. Re-installation of a used gear is not
Position the drive gear installer J 8968-01 over
the end of the crankshaft and against the drive gear and
force the gear in place as shown in Fig./y When the end
of the bore in the tool contacts the end of the crankshaft,
the drive gear is correctly positioned.
It is important that the press fit of the drive gear
to the crankshaft be checked to be sure that the gear
does not slip on the crankshaft. It is recommended the
1972 General Motors Corp.