Section VI. CYLINDER BLOCK

TM 10-3930-242-34

NOTE

rotation, and stop when TDC mark on the

c r a n k s h a f t pulley lines up with the pointer.

Make sure that the crankshaft pulley retaining bolt

( 1 8 ) When checking the engine timing, note

is not loosened during the turning operation. The

bolt may be tightened to a torque of 200-220 foot-

the reading on the indicator and compare it with

pounds if it becomes loose.

t h e dimensions listed below for the camshaft

(15) Remove the dial indicator and the weld-

b e i n g used.

ing rod or drill rod from the injector tube.

(a) If the indicator reading is 0.204-0.207

(16) Install the injector assembly and

inch, the engine is in time.

t i g h t e n the injector clamp bolt to 25-30 foot-

(b) If the indicator reading is 0.177-0.180

pounds torque. Swing the injector and valve

i n c h , the timing is one tooth retarded.

rocker arm back into position and install rocker

(c) If the indicator reading is 0.234-0.237

a r m brackets and tighten bolts to 50-55 foot-

inch, the timing is one tooth advanced.

p o u n d s torque. Adjust the exhaust valve clear-

( 1 9 ) After completing the timing check, re-

a n c e and time the injector. Turn engine over

m o v e the dial indicator; remove shipping caps

u n t i l the exhaust valves in the selected cylinder

from injector fuel fittings, and install the injec-

a r e completely open.

t o r fuel pipes, making sure that they are tight-

( 1 7 ) Install the dial indicator once again so

e n e d to prevent any fuel leaks. Remove the

t h a t the spindle of the indicator rests on top of

p o i n t e r attached to the front of the engine.

t h e injector follower. Set indicator dial to "O".

(20) Install the cylinder head rocker arm

B a r the crankshaft slowly in the direction of

cover (TM 10-3930-242-12).

Section VI. CYLINDER BLOCK

3 - 3 4 . General

d. Cleaning, Inspection, and Repair.

(1) Clean cylinder block. First remove all

This section provides the maintenance in-

plugs and scrape all old gaskets from the cylin-

s t r u c t i o n s needed by direct support and general

der block as follows:

s u p p o r t maintenance for the cylinder block and

(a) Thoroughly clean the cylinder block

end plate.

u s i n g live steam. During the cleaning, special

attention should be paid to the oil galleries, air

3-35. Cylinder Block and End Plate

box floor, and air box drain openings. Jets

a. General. The cylinder block is a one-piece

m a c h i n e d in camshaft and balance shaft bush-

c a s t i n g , serving as the main structural part of

ing block bores permit oil to be sprayed on the

the engine. A flat steel plate is bolted to the rear

c a m followers and should be checked to make

end of the cylinder block to provide a means of

sure they are not plugged. Use a 0.020-inch wire

a t t a c h i n g the flywheel housing, camshaft, and

to clean the jets.

crankshaft cover. The block has drilled passages

(b) Dry the cylinder block with compres-

f o r carrying lubricating oil to all moving parts,

sed air.

a n d fuel to the injectors, thus eliminating oil

tubing and connections throughout the block.

(2) Pressure test cylinder block.

The model number and serial number are

(a) Make sure the seal ring grooves in cy-

stamped on right-hand side of cylinder block on

linder liner bore of block are clean. Then, install

t h e upper rear corner.

seal rings in the grooves.

(b) Apply a light coating of vegetable-type

b. Removal.

s h o r t e n i n g or permanent-type antifreeze solu-

(1) Remove the engine (para 2-5).

tion to the inner diameter surface of seal ring in

(2) Remove the cylinder head (para 3-19).

c o n t a c t with cylinder liner.

(3) Remove the blower (para 3-5) and

(c) Carefully slide the liner into the cylin-

blower drive (para 3-6).

d e r block bore, and through seal rings, being

( 4 ) Remove the crankshaft (para 3-32).

careful not to roll or damage seal rings. Do not

( 5 ) Remove the camshaft, balance shaft and

f o r c e . Hold the liners in position with suitable

b e a r i n g s (para 3-29).

m e t a l plates bolted to the top of the cylinder

(6) Remove pistons and rods (para 3-26).

b l o c k . Tighten retaining plate bolts sufficiently

(7) Remove the idler gear (para 3-30).

to hold liners in place.

( d ) Seal off the water inlet and outlet

c. Disassembly. Refer to figure 3-64 and dis-

holes airtight. This can be done by using plates

a s s e m b l e the cylinder block and end plates.

3-76