rod. Replace all defective piston pin
bushings. If a new bushing is used, the
piston bushing must be reamed to 0.002
inch clearance of the piston pin, and a
light push with the hand should install the
pin in the bushing at room temperature,
68 - 75F.
(5) Inspect the piston rings for wear, cracks,
breaks, and check the ring end gap
clearance in the cylinder bore. The gap
clearance should be 0.025 inch between
the ring ends with the ring installed in the
cylinder bore.
To check the ring
clearance, insert a piston in the cylinder
bore in the inverted position, insert each
piston ring one at a time about 2 inches
down in the cylinder bore, and bring the
bottom edge of the piston up against the
ring to square the ring in the cylinder bore.
Check the ring end gap with a feeler
gage. If the ring end gap clearance is not
as specified, the ring must be filed or
honed to specification, or the ring must be
replaced.
(6) Check the clearance between the
connecting rod bearings and the throws
on the crankshaft. The proper clearance
of the connecting rod bearings is 0.0012
1
Screw, cap, 3/8-16 x 1 in. (22 rqr)
inch minimum to 0.0039 inch maximum.
2
Washer, lock, 3/8 in. (22 rqr)
The desired connecting rod bearing
3
Oil pan
clearance is 0.0025 inch.
If the
4
Oil pan gasket
connecting rod bearing clearance is not as
5
Screw, cap, 5/16-18 x 8 in. (2 rqr)
specified, replace the connecting rod
6
Washer, lock, X/5/16 in. (4 rqr)
bearing or replace the crankshaft.
7
Filler block, rear
8
Filler block seal, rear
105.
Crane Engine Piston and Connecting Rod
9
Rear bearing oil guard
Assemblies Reassembly and Installation
10
Filler block gasket
11
Screw, cap, 5/16-18 x 7/8 in. (2 rqr)
a. Reassembly. Reassemble the crane engine
12
Washer, lock 5/16 in. (2 rqr)
piston and connecting rod assemblies in the
13
Filler block, front
reverse of the numerical sequence as illustrated
14
Filler block gasket
on figure 23.
Figure 19. Crane engine oil pan and filler block,
b. Installation.
exploded view.
(1) Install the crane engine piston and
connecting rod assemblies in the engine
(3) Inspect the connecting rods for alignment;
block in the reverse of the instructions on
straighten or replace all defective
connecting rods.
(4) Inspect piston pin bushings for oil
openings and turning in the connecting
TAGO 5030A
57
