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Page Title:
Valve Tappets and Tappet Bores in Cylinder and Crankcase. |
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 Wear limits
Sizes and fits
Field
Ref.
Depot
Fig.
Point of measurement
of new parts
maint
No.
letter
maint
2.4315 to 2.4325
2.4345
S
Inside diameter of front bushing-type
2.4355
bearing.
2.4290
2.4295 to 2.4305
2.4285
U
Out side diameter of front camshaft
journal.
0.0045L
S-U
Fit of front camshaft journal in bush-
0.0010L to 0.0030L
0. 0060L
ing type bearing.
T
0.2400 to 0.2420
Camshaft thrust plate thickness -----
b. Valve Tappets and Tappet Bores in Cylinder and Crankcase.
Inside diameter of tappet bore in
1.2513 to 1.2523
1.2533
E
1.2543
crankcase.
1.2485 to 1.2490
1.2480
K
1.2475
Outside diameter of valve tappet
measured at major diameter of
hyperbolic surface (fig. 380).
1.2473 to 1.2483
K
Outside diameter of valve tappet with
1,2463
1.2468
straight surf ace.
0.0030 to 0.0050
Fit of straight tappet in bore --------
0.0070
0.0060
E-K
Fit of valve tappet in bore -----------
0.0023L to 0.0038L
0.0060L
0.0050L
c. Cylinder Liners, Pistons, and Piston Pins.
(1) Cylinder liners.
*
*
F
Inside diameter of cylinder liner bore
4.5525 to 4.5545
in cylinder and crankcase.
*
*
H
4.5555 to 4.5559
Outside diameter of cylinder liner ---
F-H
Fit of cylinder liner in cylinder and
0.0010T to 0.0034T
crankcase bore.
G
Inside diameter of cylinder liner after
4.3125 to 4.3145
4.3165
4.3155
honing.
(2) Pistons.
HH
4.3030 to 4.3040
Diameter at top of piston skirt, 90
4.3000
4.3010
degrees to piston pin.
4.3053 to 4.3065
KK
Diameter at bottom of piston skirt,
4.3033
4.3043
90 degrees to piston pin.
(3) Piston pin.
Outside diameter of piston pin -------
1.6247 to 1.6249
1.6245
1.6243
JJ
1.6250 to 1.6252
Inside diameter of piston pin bore in
1.6262
1.6257
piston.
JJ-LL
Fit of piston pin in piston -----------
0.0001L to 0.0005L
O.OO1OL
0.OO1OL
d. Piston Rings and Ring Grooves.
(1) Piston rings (grooves 1 and 2).
EE
Width of two top compression rings --
0.1225 to 0.1240
0.1205
0.1220
PP
Diameter of two top ring grooves in
4.2980 to 4.3040
4.2860
4.2920
piston, measured over 0.1125 dia-
meter pins (fig. 334).
334
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