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Page Title:
CYLINDER HEADS, VALVE ROCKER ARMS AND SHAFTS, VALVES, VALVE GUIDE AND ROCKER ARM PUSH RODS |
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 Wear limits
Sizes and fits
Ref.
Field
Fig.
Depot
Point of measurement
of new parts
maint
No.
letter
maint
Length of pressure pump impellers --
1.3735 to 1.3750
K
1.3705
1.3720
H-K
End play between impellers and pres-
0.0020L to 0.0055L
0.0080L 0.0065L
sure pump housing (correctly as-
sembled).
M
Depth of scavenger pump impeller
1.6270 to 1.6290
1.6330
1.6310
bores.
N
Length of scavenger pump impellers.
1.6235 to 1.6250
1.6205
1.6220
M-N
End play between impellers and scav-
0.0020L to 0.0055L
0.0080L 0.0065L
enge r `pump housing (correctly as-
sembled).
AND ROCKER ARM PUSH RODS
a. Valve Rocker Arms, Shafts, and Thrust Springs.
A
Inside diameter of bearing in valve
1.0007 to 1.0022
1.0055
1.0035
rocker arm.
B
0.9998 to 1.0005
Outside diameter of valve rocker arm
0.9978
0.9988
shaft .
A-B
Fit of valve rocker arm on shaft -----
0.0002L to 0.0024L
0.0050L 0.0035L
c
Valve rocker arm thrust spring:
3.5000
F r e e length ----------------------
8.81bs1lb
Scale reading at 2-inch length ------
7 lbs
7 lbs
Maximum solid height -------------
0.7300
b. Valve Springs, Valve Seats, Valves, and Valve Guide.
(1) Valve springs.
D
Inner valve springs:
2.1100
F r e e length ----------------------
86.5 lbs 9 lbs
Scale reading at 1.33-inch length ---
86. 59
86.59
36. 5+2
Scale reading at 1.78-inch length ---
36.5 lbs +2 lbs
36. 5+2
Maximum solid height -------------
1.0700
E
Outer valve springs:
2.4300
F r e e length ----------------------
160.7 lbs 14.0 lbs
Scale reading at 1.64-inch length ---
160. 7*14 160. 7*14
Scale reading at 2.12-inch length ---
65.7 lbs 3.0 lbs
65.73.0 65.73.0
Maximum solid height -------------
1.5500
(2) Intake and exhaust valve seats.
F
2.0580 to 2.0590
Inside diameter of intake valve seat
2.0595
2.0595
bore in cylinder head.
*
*
2.0615 to 2.0625
G
Outside diameter of intake valve seat-
F-G
Fit of intake valve seat in bore ------
0.0025T to 0.0045T
0.0020T 0.0020T
*
*
M
Outside diameter of exhaust valve seat
1.8120 to 1.8130
N
1.8080 to 1.8090
Inside diameter of exhaust valve seat
1.8095
1.8095
bore in cylinder head.
M-N
Fit of exhaust valve seat in bore -----
0.0030T to 0.0050T
0.0025T 0.0025T
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