Pistons and Connecting Rods - TM-10-3930-624-340043

(j) The specified thickness of the thrust

(6) Remove the camshaft (4). Be careful to

plate is 0.1650-0.1670 inch.

keep it aligned with the engine so the camshaft

(k) The fit of the camshaft gear on the

bearings do not bind on the journals.

camshaft is 0.0010-0.0030 inch tight.

(7) Remove the flywheel housing (para 3-14).

d. Reassembly. Reassemble the camshaft in

(8) Remove the expansion plug (11) from the

reverse order of disassembly.

camshaft rear bearing bore.

e. Installation.

(9) Use a camshaft bearing removal and in-

(1) Install the camshaft bearings (5, 6 and 7,

stallation tool to remove the camshaft bearings (5,

fig. 3-14), alining the oil holes in the bearings with

6 and 7).

the oil holes in the block. Use a camshaft bearing

b. Disassembly.

removal and installation tool to properly position

(1) Remove the camshaft gear retaining ring

the bearings. Insert a wire through the oil hole to

(8, fig. 3-14).

make sure the holes line up.

(2) Use a gear puller to remove the camshaft

(2) Install a new camshaft hole plug (11) in

gear (9) from the camshaft.

the bore in the cylinder block at the camshaft rear

(3) Remove the key (10) from the camshaft.

bearing location.

c. Cleaning, Inspection, and Repair.

(3) Check the thrust clearance by inserting a

(1) Clean the camshaft and camshaft bearings

feeler gage between the thrust plate (3) and the

with a cleaning solvent.

cam shaft bearing surface. The specified clearance

(2) Inspect the camshaft gear for worn,

is 0.003-0.008 inch. If the end clearance exceeds

nicked, or broken teeth.

the maximum wear limit of 0.014 inch, remove the

(3) Use a telescopic gage, micrometer, or other

gear (9) from the camshaft (4). File the back side of

suitable measuring device to obtain the following

the gear hub. This permits pressing the gear further

measurements. If the measurements do not fall

on the shaft and reduces the thrust plate clearance.

within the specified limits the parts must be

(4) Install the camshaft (4), making sure the

replaced.

timing marks on the camshaft and crankshaft gears

(a) ID of front and intermediate camshaft

are aligned to ensure proper engine timing.

bearings (when i n s t a l l e d i s 2 . 0 0 1 0 - 2 . 0 0 4 0

(5) Reinstall the remaining engine components

inches. The ID of the rear camshaft bearing when

by reversing the removal procedures.

installed is 1.2510-1.2540 inches.

(6) Install the drain plug in the oil pan and

(b) OD of front and intermedite camshaft

service the lubrication system. Refer to the current

journals in 1.998-1.999 inches. The OD of the rear

LO 10-3930-624-12.

camshaft journal is 1.2480-1.2490 inches.

3-16. Pistons and Connecting Rods

( c ) T h e camshaft bearing-to-journal

a. Removal and Disassembly.

running clearance is 0.0020-0.0060 inch.

(1) Remove the cylinder head. Refer to

(d) OD of front and intermediate camshaft

paragraph 3-12. Cover the cylinder head and top of

bearings is 2.1285-2.1305 inches. The OD of the

the engine to prevent dust from entering into the

rear camshaft bearing is 1.3790-13805 inches.

exposed parts.

(e) The bore in the block for the front and

(2) Remove the steer axle assembly. Refer to

intermediate camshaft bearings is 2.1240-2.1250

paragraph 2-10.

inches. The bore for the rear camshaft bearings is

(3) Drain the oil from the crankcase. Remove

1.3740-1.3750 inches.

the oil pan (para 3-8) and oil pump (para 3-6).

(f) The fit for the front and intermediate

(4) If the cylinder sleeves are worn so there is a

camshaft bearings in the bore of the cylinder block

ridge at the upper end of the ring travel, remove the

is 0.0020-0.0060 inch tight. The fit for the rear

ridge with a ridge reamer before the piston is

camshaft bearing is 0.0040-0.0065 inch tight.

removed. This prevents damage to the rings during

(g) The overall width of the camshaft

removal and installation.

bearings are: front-1 1/8 inches, intermediate-7/8

(5) Remove the nuts (1, fig. 3-15), and bearing

inch, and rear-l inch.

caps (3) from each connecting rod (8) in turn and

(h) The camshaft end clearance is

push the piston (7) and connecting rod assembly

0.0030-0.0080 inch.

out through the top of the cylinder block.

(i) The camshaft gear width is 1 inch.

3-17