Camshaft bearings.

1. Remove gear retaining ring (20,

61820).

fig. 3-37.

(d) Remove steering axle assembly

2. Install gear puller and remove

(para 2-14).

gear (19) and key (16) from shaft.

(e) Remove timing gear cover (para 3-

3. File back of gear hub (side

25).

facing cylinder block). This permits pressing gear further

(f) Remove lubricating oil pump (para

onto shaft, reducing thrust plate clearance.

3-13).

(g) Rotate crankshaft until openings in

round and deviations from design diameters.

Specified diameters of camshaft journals are-

camshaft gear align with thrust plate capscrews (18, fig.

1. 1.248 inch to 1.249 inch for the

3-37), then remove capscrews.

(h) If engine is in truck, push valve

flywheel end.

2. 1.998 inch to 1.999 inch for the

lifters (22, fig. 3-37) upward in cylinder block. In most

intermediate and gear end journals.

cases. they fit tight enough in the lifter bore to stay out of

(d) Check valve lifters for wear. Valve

the way of the cam lobes. If they do not stay out of the

way voluntarily, they may be lifted separately by rotating

lifters fit in their bores is 0.0010 inch to 0.0025 inch. If

the camshaft while removing it.

wear exceeds 0.0035 inch, lifters should be replaced.

(i) If the engine has been removed

Lifters must be free to rotate in their bores, otherwise

from truck, turn engine on its side, push the lifters up into

scuffing will result.

(2) Camshaft bearings.

their bores and they will stay out of the way of the

(a) Check camshaft bearings for

camshaft lobes during removal.

(j) Remove camshaft by drawing it out

excessive looseness, wear, or other damage.

(b) Check inside diameter of bearings

of the cylinder block at the gear end. Be careful to keep

it aligned with bore so that the camshaft bearings will not

for roundness and conformance to specifications, which

bind on the camshaft journals.

are -

(k) Remove valve lifters from the cylinder

1. 1.2510 inch to 1.254 inch for the

block by withdrawing them from their bores.

bearing at the flywheel end of engine.

(2) Camshaft bearings.

2. 2.0010 inches to 2.004 inches for

(a) Remove camshaft as described in

the intermediate and gear end camshaft bearings.

(11 above.

(b) Remove flywheel housing (para 3-

journals and bearings exceeds 0.0065 inch, new

26).

camshaft bearings must be installed.

d. Installation.

(1) Camshaft bearings.

3-32) from flywheel end of camshaft bore.

(d) If removing and installing tool is not

(a) Install camshaft bearings with

available, carefully cut through gear end bearing (5) with

camshaft bearing installing tool (fig. 3-38).

a hacksaw blade, being careful not to cut into crankcase.

NOTE

(e) Break bearing with hammer and

The bearing nearest the flywheel end of

chisel and remove it.

block is 1.0 inch wide, intermediate is 7 /

(f) Remaining bearings (6 and 7) can

8 inch wide, and the gear end bearing is

be removed as outlined in (d) and (e) above, or with

1 1/8, inch wide.

installing tool (fig. 3-38).

(b) Drive bearings into place with a

c. Inspection and Repair.

driving bar.

They do not require reaming after

(1) Camshaft and lifters.

installation.

(a) Check camshaft thrust clearance

(fig. 3-39) by inserting feeler gauge between thrust plate

open end of bore in the flywheel housing mounting face

and camshaft bearing surface (fig. 3-39). Specified

of the cylinder block.

thrust clearance is 0.003 inch to 0.008 inch.

(2) Camshaft and valve lifters. Install by

(b) If end clearance exceeds maximum

direct reversal of procedures in b above.

wear limit of 0.014 inch, remove gear from camshaft and

3-49