Section V. CAMSHAFT, BALANCE SHAFT, AND CRANKSHAFT

TM 10-3930-242-34

to connecting rod (16) and rings (9, 10, and 11) in

cylinder block where erosion or corrosion of the

place, apply clean oil to piston, rings, and inside

upper seal ring groove has occurred. The lower

seal ring groove in the current cylinder block has

o f sleeve ring compressor,

been eliminated, Reinstallation of the seal ring in

( 2 ) Place ring compressor on a woodblock

the former block is not required.

w i t h taper end up.

(2) Apply vegetable type shortening or

(3) Stagger the piston ring gaps properly on

p e r m a n e n t type antifreeze solution to the seal

t h e piston. Insure that oil control ring expan-

ring.

d e r s are not overlapped.

( 3 ) If any pistons and liners are already in

( 4 ) Start the piston straight into the ring

place, use holddown clamps to keep the liners in

compressor and push the piston down until it

p l a c e when the crankshaft is rotated.

contacts the wood block,

( 4 ) Rotate the crankshaft until the connect-

( 5 ) Note position of the matched mark on

i n g rod journal of the particular cylinder being

the liner and place the liner on a block of wood.

worked on is at the bottom of its travel, wipe the

(6) Place the ring compressor and the piston

j o u r n a l clean and lubricate it with clean engine

and rod assembly on the liner, so that the num-

oil.

bers on the rod and cap are aligned with the

( 5 ) Install the upper bearing shell (the one

m a t c h mark on the liner.

with a short groove at each parting line) in the

NOTE

c o n n e c t i n g rod. Lubricate the shell with clean

The numbers, or number and letter on the side of

engine oil.

the rod and cap identify the rod with the cap and

(6) Hold the piston, rod and liner in line

indicate the cylinder in which they are to be used.

w i t h the block bore so that the identification

If new rods are used, etch or stamp the same iden-

n u m b e r of the rod is facing the serial number

tification, in the same location as on the connect-

side of the block. Also align the match marks on

ing rod/rods replaced.

t h e liner and block. Slide the entire assembly

CAUTION

i n t o the block bore and seal ring, being careful

Do not force the piston into the liner. The

n o t to damage the seal ring,

expanders apply considerable force on

( 7 ) Pull or push the piston and connecting

the oil ring; therefore, extra care must

rod down until the upper bearing seats firmly on

be taken during the "loading" operation

the crankshaft journal; use care so that the

to prevent ring breakage.

bearing shell will not be dislodged from the rod.

( 8 ) Place the lower bearing shell (the one

(7) Push the piston and rod assembly down

w i t h the continuous oil groove) in the connect-

into the liner until the piston is out of the com-

i n g rod cap with the tang on the groove in the

pressor.

n o t c h in the cap. Lubricate the bearing shell

( 8 ) Remove the connecting rod cap and the

w i t h clean engine oil.

r i n g compressor.

( 9 ) Install the bearing cap and shell on the

(9) Push the piston down into the liner until

c o n n e c t i n g rod with the number on the cap and

t h e compression ring passes the liner ports.

rod adjacent to each other. Tighten the connect-

f. Installation After the piston and connect-

ing rod nuts (3/8-24 bolts) to 45-50 ft-lbs. torque

(lubricated) or 50-55 ft-lbs. torque (plain).

ing rod assembly have been installed in the

(10) Check the connecting rod side clearance.

l i n e r , the entire assembly may be installed in

the engine as follows:

The clearance should be 0.006-0.012 in. with new

parts.

( 1 ) Make sure the seal ring groove in the

(11) Remove the holddown clamps, Install

cylinder block is clean, then install the seal ring.

n e w compression gaskets, water and oil seals

NOTE

a n d install the cylinder head (para 3-19).

The current cylinder block has an additional seal

( 1 2 ) Install oil pan (para 3-24) and refer to

r i n g groove approximately 1/8" below the top

groove. This groove will permit further use of the

the lubrication order and fill crankcase with oil.

Section V. CAMSHAFT, BALANCE SHAFT, AND CRANKSHAFT

3 - 2 7 . General

that meshes with the camshaft gear. Crank-

The camshaft lobes that operate the push rods

s h a f t thrust is taken through two-piece washers

t h a t directly operate the valves and fuel injec-

on each side of the rear main bearing. All main-

t o r s . The balance shaft operates from a gear

and connecting-rod bearing journal surfaces

3-63