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 (3) After assembling the pump, rotate the gear
lockwasher and tighten both capscrews to a torque
(8) to make sure it turns freely.
of 18 to 21 ft lbs. Do not overtighten the capscrews.
e. Installation.
(g) After the pump is secured in position,
(1) Use the following procedure to install the
check the gear backlash between the drive gear and
oil pump. If the distributor and the oil pump were
the gear on the camshaft. Correct gear backlash is
both removed from the engine, refer to (2), below.
0.004-0.010 inch and can be checked through the
(a) Make certain the distributor rotor is
opening at the fuel pump mounting pad.
aligned with the reference mark made on the side of
(h) Install the oil tube from the block to the
the distributor housing as instructed in a, above.
pump and tighten the nuts securely.
(b) Position the offset of the oil pump in the
cylinder block. Use a dial indicator to position the
offset of the pump drive gear to the right, towards
(2) If the engine was overhauled, or if the oil
the rear of the cylinder block, so the slot will be at
pump and the distributor were both removed, use
the specified angle (fig. 3-5).
the following procedures to install the oil pump.
(a) Rotate the crankshaft in the direction of
engine rotation until the No. 1 cylinder exhaust
valve lobe on the camshaft points horizontally to
the side of the cylinder block. When the No. 1
cylinder exhaust valve camshaft lobe is in this
position, the piston is on the compression stroke
near or at top dead center. The timing mark
stamped on the flywheel should be in the timing
hole in the flywheel housing.
(b) Position the offset of the oil pump in the
cylinder block. Use a dial indicator to position the
offset of the pump drive gear to the right towards
the rear of the cylinder block, so the slot will be at
the specified angle. Refer to figure 3-5.
(c) Insert the oil pump in the cylinder block,
engaging the oil pump drive gear with the gear on
the camshaft. As the pump drive gear meshes with
the camshaft gear, it will rotate slightly. When the
pump gear is fully engaged with the camshaft gear.
the slot will be positioned at a specified angle. Refer
to figure 3-5. Install the capscrews finger-tight to
hold the pump in position.
(d) Insert the distributor into the cylinder
block and rotate the rotor until the offset tang on
Figure 3-5. Positioning drive gear offset slot.
the distributor drive engages the slot in the pump
drive gear. In this position the rotor will be pointing
(c) Insert the oil pump in the cylinder block,
to the No. 1 cylinder spark plug wire in the
engaging the oil pump drive gear with the gear on
distributor cap.
the camshaft. Install one retaining capscrew and
(e) Install the cap on the distributor.
lockwasher and tighten only enough to hold the
(f) Install the second retaining capscrew
pump in place.
and lockwasher and tighten both capscrews to a
Caution: Do not tighten the capscrews
torque of 18 to 21 ft-lbs. Do not overtighten.
unless the pump drive gear has properly
(g) After the pump is secured in position,
engaged with the gear on the camshaft and the
check the gear backlash between the drive gear and
tang on the distributor drive engages with the
the gear on the camshaft. Gear backlash is 0.004-
drive slot in the pump gear.
0.010 inch and can be checked through the opening
(d) After the oil pump is in mesh with the
at the fuel pump mounting pad.
gear on the camshaft, check to make certain that
(h) Install the oil tube and tighten the front
the distributor drive has engaged the slot in the
and rear tube nuts securely.
pump drive gear. Make certain the rotor is pointing
to the reference mark made on the side of the
housing.
(e) Install the cap on the distributor.
(f) Install a second retaining capscrew and
3-7
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