Checking Camshaft Gear Backlash.

t o r q u e of 210 to 250 foot-pounds. Tap the pulley

(5) Remove the bolt (1) and washer (2) and

r e m o v e the pulley assembly. Remove six bolts (3)

with a soft hammer and retighten to the same

torque.

and lockwashers (4) and separate the vibration

damper (5) from the pulley (6).

(9) Install the vibration damper (5) to th

p u l l e y (6) and secure with six bolts (3) and lock-

(6) Remove four bolts (7) and lockwashers

washers (4).

(8) and remove the front support (9).

( 1 0 ) Install the cover (21) and a new gasket

(7)

Remove

the

bolts

(10)

and

lockwashers

( 2 2 ) and secure with four nuts (19) and washers

(11) which secure the oil pan (12) to the timing

(20).

gear cover. Loosen the remaining bolts which

secure the oil pan to the cylinder block, Using a thin

(11) Install the water Pump (5-6), fan belts

knife or screwdriver, carefully separate the oil pan

(5-5) and generator (TM 5-2410-233-20).

a n d gasket from the timing gear cover.

(12) Install the engine (para 2-8).

d. Timing Mark Alignment.

b. Inspection and Repair.

(1) Inspect the timing gear cover for chips,

(1) Remove the timing gear cover (subpara

a, above).

cracks, and other damage and for distortion.

Repair as required.

( 2 ) Rotate the crankshaft in the direction of

engine rotation until the No. 1 piston is at top dead

(2) Inspect the timing gears for broken or

missing teeth, excessive or uneven wear and cracks,

center on the compression stroke and the timing

marks are matched, Refer to figure 5-45.

chips and other damage. Repair or replace as

required.

(3) Inspect the seal (item 18, fig, 5-44) for

d a m a g e and deterioration and replace if necessary.

(4) Inspect the crankshaft pulley and

v i b r a t i o n damper for damage and wear. Repair or

r e p l a c e as required.

c. Reassembly and Installation (fig. 5 - 4 4 ) .

(1) Heat the camshaft gear (34) and install on

t h e camshaft. Align the timing marks (subpara e ) .

Secure with four camshaft gear retaining bolts (32)

and

the

lock

(33).

Check

the

gear

backlash

(subpara f).

(2) Install the plate (30), spacer (31), and

accessory drive idler gear (29). Secure with two

bolts (27) and locks (28).

( 3 ) Install the washer (25), retainer (26), and

the accessory drive gear (24) on the accessory drive

s h a f t . Align the timing mark on the gear with the

timing mark on the idler gear (28). Refer to

s u b p a r a g r a p h e. Install the retaining nut (23) and

tighten to a torque of 90 to 110 foot-pounds.

(4) Install a new mounting gasket (17),

Install the timing gear cover (16) to the engine

block and plate, and secure with bolts (13),

Figure 5-45. Timing gears and marks.

washers (14) and lockwashers (15).

(5) Install the bolts (10) and lockwashers

(3) If the timing marks are not properly

(11) which secure the oil pan (12) to the timing

aligned, remove

and reinstall the gears as

gear cover, Tighten the remaining bolts which

necessary.

s e c u r e the oil pan to the cylinder.

e. Checking Camshaft Gear Backlash.

( 6 ) Install a new seal (18) in the timing gear

( 1 ) Check the backlash between the camshaft

cover (16) if the old seal was removed. Using a

g e a r and the crankshaft gear by installing a dia

sleeve to protect the seal, install the seal with the

i n d i c a t o r , Backlash should be 0.001 to 0.010 inch

s p r i n g - l o a d e d lip toward the cylinder block.

(2) If backlash is excessive, check for worn

(7) Install the front support (9), securing with

t i m i n g gears, bearings or camshaft bearings (para

four bolts (7) and lockwashers (8).

5-27).

(8) Press on the pulley (6) and secure with the

bolt (1) and washer (2). Tighten the bolt to a

5-62