TM 55-1930-209-14&P-21
(4)
Inspect pressure relief valve and its seat in oil pump body.
(5)
Discard and replace all gaskets and seals.
(6)
Repair by replacement of defective parts.
6-21 Oil pump reassembly and installation
a.
Reassembly
(1)
Reassemble oil pump in reverse of disassembly sequence.
(2)
To install pump drive gear on crankshaft with lower front cover removed:
(a) Lubricate inside of oil pump gear with engine oil. Then start gear straight onto shaft, chamfered
edge first.
NOTE
Reinstallation of a used gear on crankshaft is not recommended.
(b) Press gear on crankshaft until it is seated against shoulder.
b.
Installation.
(1)
Install oil pump in reverse of removal sequence.
(2)
Install lower front cover.
(3)
Install oil pan.
Section VIII. Engine Front Cover, Camshaft, Balance Shaft, and Timing Gears
6-22 General
a.
Camshaft and Balance Shaft
(1)
Camshaft and balance shafts are located near top of cylinder block. Camshaft actuates valve and fuel
injector mechanisms.
(2)
Both ends of camshaft and balance shaft are supported by bearings. In addition, two intermediate
bearings and a center bearing support camshaft.
(3)
On both cam and balance shafts, thrust load is absorbed by two thrust washers on each end of rear end
shaft bearings.
(4)
A helical drive gear with a counterweight is secured to cam and balance shafts with a Woodruff key and
hexnut. Drive gears are attached to ends of cam and balance shafts.
(5)
To help maintain engine balance, a solid weight is attached on front end of shaft.
b.
Gear Train
(1)
A completely enclosed train of five helical gears (Figure 6-23) is located at rear of engine. A gear bolted to
crankshaft flange drives camshaft and balance shaft gears, as well as blower drive gear, through an idler gear mounted
between crankshaft and balance shaft gears.
6-46
