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ENGINE: PISTONS· CONNECTING RODS
PISTONS - CONNECTING RODS
MAIN SPECIFICATIONS
.
Cleaning
,
Checking Piston Clearance in Bore and Piston Pin Clearance in Boss
Checking Piston and Connecting Rod Weight.
Piston Rings . . . . . . . . . . . . . . . .
Removing Piston Pin . . . . . . . . . . .
Piston· Pin· Connecting Rod Assembly
Checking Piston Pin Drag
Connecting Rod Bearings . . . • . . . . .
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MAIN SPECIFICATIONS
PISTONS - PINS - RINGS - CONNECTING RODS - BEARINGS
DESCRIPTION
I
in
rom
Standard piston diameter, at right angle to pin:
)
Class A
2.5578 to 2.5552
64.970 to 64.980
- 1.555" (39.5 rom) apart
(rom
Class C
2.5586 to 2.5590
64.990 to 65.000
piston head .
Class E
2.5594 to 2.5598
65.010 to 65.020
Pistons for service
.
5td, .0079-.0157-.02360.5.
0.2-0.4-0.6
)
Class I
.7867 to .7868
19.982 to 19.986
Piston boss bore .
.
Class 2
.7868 to .7870
19.986 to 19.990
Class 3
.7870 to .787l
19.990 to 19.994
)
Top groove
.0703 to .0711
1.785 to 1.805
Piston
ring
groove height
Center groove
.0793 to .0801
2.015 to 2.035
Bottom groove
.1555 to .1566
3.957 to 3.977
- -
)
Class 1
.7862 to .7864
19.970 to 19.974
Standard piston pin diam
.
.
Class 2
.7864 to .7865
19.974 to 19.978
Class 3
.7865 to .7867
19.978 to 19.982
Piston pins for service
.
Std, .0079 0.5.
0.2
Piston ring thickness:
-
first compression ring
.
.
.0680 to .0685
1.728 to 1.740
-
second oil ring
.
.0779 to .0783
1.978 to 1.990
-
third radial-slotted oil ring
.1535 to .1547
3.900 to 3.930
Piston fit in bore (at right angle to pin, 1.555" -
39.5 rom - apart from piston head):
-
clearance of new parts
.0008 to .0016
0.020 to 0.040
- wear limit
.006
0.15
(COtltinlltd)
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