Section VI. CYLINDER BLOCK AND RADIATOR

slowly until indicator reading is 0.010-then stop

assemblies back out of the way. Remove the in-

turning.

jector assembly.

(13) Scribe a second line on the crankshaft

(4) Carefully place (do not drop) a welding rod

pulley in the same manner as in step 10.

or drill rod approximately 12 inches long through

(14) Scribe a third line halfway between the

the injector hole and on top of the piston. With the

first two lines. This is positive top-dead-center.

throttle in the NO FUEL position, bar the

Remove the indicator from the engine.

crankshaft slowly in the direction of rotation of the

engine, and stop barring when the rod reaches

NOTE

the end of its upward travel. Remove the rod and

Make sure that the crankshaft pulley retaining bolt is

not loosened during the turning operation. The bolt

bar the crankshaft opposite the direction of rotation

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

between 1/16 and 1/8 of a turn.

if it becomes loose.

(5) Select a dial indicator having 0.001 inch

graduations and with a spindle movement of at

(15) Remove dial indicator and welding rod or

least 1 inch. Use suitable mounting attachments for

drill rod from injector tube.

the indicator so that it can be mounted over the

(16) Install injector assembly and tighten the

injector hole in the cylinder head. Provide an ex-

injector clamp bolt to 25-30 foot-pounds torque.

tension for the spindle of the indicator. The ex-

Swing the injector and valve rocker arm back into

tension must be long enough to contact the piston

position and install rocker arm brackets and tighten

as it is approaching its upper position.

b o l t s to 50-55 foot-pounds torque. Adjust the

(6) Mount the indicator over the injector hole

exhaust valve clearance and time the injector. Turn

and tighten mountings sufficiently to hold the

engine over until the exhaust valves in the selected

indicator rigid.

cylinder are completely open.

(17) Install the dial indicator once again so

NOTE

The mounting leg may be threaded into the rocker

that the spindle of the indicator rests on top of the

rover retaining screw hole on the injector rack side of

injector follower. Set indicator dial to "0". Bar the

the cylinder head. Make sure that the spindle ex-

crankshaft slowly in the direction of rotation, and

tension is free in the injector hole, does not bind, and

stop when TDC mark on the crankshaft pulley

is free to travel its full 1 inch movement.

lines up with the pointer.

(7) Provide a suitable pointer and attach it to

(18) When checking the engine timing, note

the lower engine front cover. Pointer should extend

the reading on the indicator and compare it with

over the crankshaft pulley.

the dimensions listed below for the camshaft being

(8) Turn the crankshaft in the direction of

used.

rotation slowly until the hand on the dial indicator

(a) If the indicator reading is 0.204 to 0.207

just stops moving.

inch, the engine is in time.

(9) Turn the crankshaft in the direction of

(b) If the indicator reading is 0.177 to 0.180

rotation until the indicator hand just starts to move.

inch, the timing is one tooth retarded.

Reset dial to 0. Continue barring slowly until in-

(c) If the indicator reading is 0.234 to 0.237

dicator reading is 0.010-then stop turning.

inch. the timing is one tooth advanced.

(10) Scribe a line on the crankshaft pulley in

(19) After completing the timing check,

line with the end of the pointer.

remove the dial indicator; remove shipping caps

( 1 1 ) T u r n t h e c r a n k s h a f t o p p o s i t e the

from injector fuel fittings, and install the injector

direction of rotation slowly until the hand on the

fuel pipes, making sure that they are tightened to

dial indicator just stops moving.

prevent any fuel leaks. Remove the pointer at-

( 1 2 ) T u r n t h e c r a n k s h a f t o p p o s i t e the

tached to the front of the engine.

direction of rotation until the indicator hand just

(20) Install the cylinder head rocker arm cover

starts to move. Reset dial to O. Continue barring

( T M 10-3930-242-12).

Section VI. CYLINDER BLOCK AND RADIATOR

3-35. Cylinder Block and End Plate

injectors, thus eliminating oil tubing and con-

nections throughout the block. The model number

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

and serial number are stamped on right-hand side

casting, serving as the main structural part of the

of cylinder block on the upper rear corner. The

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

radiator is bolted to the front of the engine base and

the cylinder block to provide a means of attaching

the flywheel housing, camshaft and crankshaft

is used for cooling the engine.

cover. The block has drilled passages for carrying

b. Removal.

lubricating oil to all moving parts, and fuel to the

(1) Remove the engine (para 2-9).

3-105