Service Manual

DESCRIPTION
MINIMUM
. MAXIMUM
Inches (mm) Inches (mm)
(standard size)
Measure 90° from
pin bore
1 .187 below top of piston. ................................ 3.2445
Top Groove
.....................................
....... 0.0800.
Middle Groove.
........................................
0.0800
Bottom Groove.
.........................................
0.1 880
Top Groove Clearance.
................................... 0.0030
Pin Bore
................................................ 0.6877
Pin Clearance
............................................ 0.00004
Ring Groove Width
(82.41)
(2.032)
(2.032)
(4.775)
(0.076)
(1 7.47)
(0.001)
3.2462 (82.45)
0.081
0
(2.057)
.0.0810
(2.057)
.0.1890
(4.800)
0.0080
(0.203)
0.6882
(1 7.48)
0.00064
(0.01 6)
PISTON PIN
Diameter ....................... ........................ 0.6875 (1 7.46) 0.6877 (1 7.47)
PISTON RINGS
End Gap .......................................... 0.01 00 (0.254) 0.0200 (0.508)
INTAKE VALVE
Stem Diameter ........................................... 0.2795 (7.099) 0.2800 (7.1 12)
Face Angle
................................. ........... 44
INTAKE VALVE SEAT
Seat Width ............................................... 0.031 0 (0.787) 0.0470 (1.1 94)
Seat Angle
.............................................. 45°
Outside Diameter
........................................ 1.4700 (37.34) 1.471 0 (37.36)
VALVE
Stem Diameter ........................................... 0.2780 (7.061) 0.2785 (7.074)
Face Angle
.............................................. 44
EXHAUST VALVE SEAT
Outside Diameter ........................................
Seat Width ..............................................
Seat Angle ..............................................
VALVE GUIDE
Intake Inside Diameter ....................................
Intake Stem to Guide Clearance ...........................
Exhaust Inside Diameter ..................................
Exhaust Stem to Guide Clearance.. ........................
TAPPET
Body Diameter. ..........................................
VALVE SPRINGS
Valve Open Length .......................................
Valve Closed Length ......................................
Spring Load (valve open length) ...........................
Free Length (approximate) ................................
Spring Load (valve closed length) ..........................
GEAR BACKLASH
Timing Gear .............................................
Oil Pump Gear.. .........................................
1.1 920
(30.28)
1.1 930
0.031
0
(0.787)
0.0470
45°
-
0.281 0
(7.1 37)
0.2820
0.001
0
(0.025)
0.0025
0.2805
(7.1 25)
0.281
5
0.0020
(0.051)
0.0035
0.7475 (1 8.99) 0.7480
(30.30)
(1.194)
(7.1 63)
(0.064)
(7.1
50)
(0.089)
1.600
(40.64)
1.055
(26.80)
1.346
(34.1 9)
55 Ib.
(25 kg)
25
Ib.
(11 kg)
0.001 0
(0.025)
0.0050
0.001 0
(0.025)
0.0080
(1 9.00)
(0.1 27)
(0.203)
3-2