TM 5-3810-294-34
Refer to figure 4-5 and reassemble and install oil pump
4-27. Disassembly
and oil pan as follows.
Refer to figure 4-5 and disassemble oil pump as follows:
a. Lubricate all pump gears and shaft with engine oil
a. Remove cotter pin (12) and remove screen and
for initial lubrication.
float (13).
b. Install shaft (22) in pump body (23), and install idler
b. Remove capscrews (14), lockwashers (15), and
gear (18).
cover (16). Remove gasket (17).
c. Check the clearance between the outside diameter
c. With the pump cover removed and the gears and
of the gear and the bore of the housing as was done
shaft in place, exert pressure against the gears with the
during disassembly. Check the pump shaft clearance in
thumb so as to push the gears away from the outlet side
the bore of the body and the backlash between the pump
of the pump. Measure the clearance between outside
body gears against values given in table 1-4.
diameter of gear and bore of housing. Clearance should
d. Assemble gasket (17) and cover (16), and check
be within the limits given in table 1-4. Check backlash
the body gear end clearance. The pump cover gaskets
between pump body gears and replace gears if backlash
control the end play between the gears and the pump
exceeds the figure shown in table 1-4.
cover. Add or remove gaskets to obtain the proper
d. Lift oil pump idler gear (18) from the idler gear
clearance shown in table 1-4.
shaft. Support the oil pump shaft to prevent bending,
e. Install key (21) in shaft (22). Press gear (20) into
and drive pin (19) from the gear. Press gear (20) from
place on shaft (22) and secure gear to the shaft with pin
shaft. Remove key (21) from shaft (22). Remove shaft
(19). Install gasket (17), cover (16) and install washers
(22) from pump body (23).
(15) and capscrews (14).
4-28. Cleaning
a. Clean all metal parts in dry cleaning solvent
Note. Remove the distributor before attempting to
(Federal Specification P-S-661) and dry thoroughly with
install the oil pump.
compressed air.
b. Remove all remaining gasket material from parts.
f. Place gasket (24) on pump housing and insert the
4-29. Inspection
oil pump into the block so that the slot at the top of the oil
a. Inspect all gears for wear and chipped teeth.
pump shaft is at a 30 degree angle to the side of the
b. Inspect the body and oil pump cover for evidence
engine when the No. 1 piston is at top dead-center of
of wear (gear contact) for damage.
the compression stroke. Secure the pump to the engine
4-30. Repair and Replacement
block with capscrews (10) and washers (11).
a. Refer to TM 5-3810-294-34P for repair parts.
g. Position the oil pump float on the oil pump, line up
b. Replace all damaged gears.
the pin holes, and insert a new cotter pin (12).
c. Refer to the inspection made during disassembly
h. Position gaskets (7) on pan (6), and position oil pan
(para 4-27 step c) in determining the gear to body
assembly on the engine. Secure with capscrews (3),
clearance and gear backlash. Replace necessary parts
nuts (5) and washers (4). Torque capscrews to 25 foot-
if this inspection reveals variations from the values
pounds.
shown in table 1-4.
i. Install tube (9), dipstick (8), gasket (2) and plug (1).
4-31. Reassembly and Installation
Section VI. REPAIR OF CAMSHAFT, CRANKSHAFT, PISTONS AND RODS
bushings are press-fit in the crankcase and are
4-32. Description
removable. The camshaft operates the intake and the
a. The crankshaft supports the connecting rod and
exhaust valve mechanism by action of its lobes upon the
pistons along its length. At the forward end is the
pushrods during rotation.
Camshaft bearings are
crankshaft gear which drives the camshaft.
The
pressure lubricated by oil holes drilled in the bearings.
crankshaft is a drop forging of heat treated steel. It is
Oil holes in the bushings must aline with the holes drilled
counterweighted, dynamically balanced, and ground to
in the crankcase.
close limits.
c. The rods serve as links between the pistons and
b. The camshaft is located in the crankcase on the
the crank throw.
left side of engine, and is held to the crankcase by a
4-33. Removal
thrust plate. The camshaft is supported at intervals
along its length by four bushings.
These
Refer to figure 4-6 and remove camshaft as follows.
4-9
