1
Cotterpin (12 rqr)
7
Piston ring (6 rqr)
2
Nut (12 rqr)
8
Piston ring (6 rqr)
3
Connecting rod
9
Piston ring (6 rqr)
4
Bearing halves
10
Retaining ring (12 rqr)
5
Bolt (12 rqr)
11
Piston pin ( rqr)
6
Sleeve bearing (6 rqr)
12
Piston
Figure 3-64. Piston and connecting rod for engine model D33TA, exploded view
(5) Push up on connecting rod until piston rings
are out of cylinder sleeve, then lift piston and rod out of
(2) Inspect pistons and rings for scoring,
cylinder.
damage, or wear. Determine piston ring side clearance
(6) Repeat steps (4) and (5) above for remaining
as follows:
pistons
(a) Top ring side clearance should measure
(7) Remove retaining ring (10) and piston pin
between 0.0030 and 0.0044 inch. Maximum permissible
(11), then separate connecting rod (3) and piston (12).
is 0.007 inch.
(8) Remove sleeve bearing (6) from connecting
rod (8).
(b) Middle ring side clearance should measure
between 0.0025 and 0.0039 inch.
b. Cleaning, Inspection, and Repair.
(c) Bottom, or oil control ring, side clearance
(1) Clean all parts and dry thoroughly before
should measure between 0.0015 and 0.0088 inch.
inspection or reassembly.
(d) With new rings and cylinder sleeve, top ring
gap should measure between 0.017 and 0.023 inches.
NOTE
Middle ring gap between 0.018 and 0.024 inches. Oil
If pistons are soaked overnight in
control ring gap between 0.0131 and 0.013 inches.
water then allowed to dry thoroughly
in sunlight, most of the carbon can
(3) Inspect piston sleeve beating and pin for wear or
be removed with a hardwood stick
damage.
without damage to ring grooves. Be
sure bottom of each ring groove is
clean, and oil return hole is open,
before new rings are installed.
3-75
