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TM 10-3930-632-34
CHAPTER 9
REPAIR OF ENGINE
Section I. DESCRIPTION
electrical system, including a coil and distributor type
9-1.
General
ignition system, starting system, and battery charging
system with an alternator. Detailed descriptions of the
The engine is a four-cylinder, four stroke-cycle,
various components of the engine are presented in
water-cooled,  valve  in  block,  pressure-lubricated,
applicable paragraphs through this chapter.
gasoline engine. The engine is equipped with a 12-volt
Section II. ENGINE WEAR LIMITS
parts. Refer to this table to determine if parts can be
9-2.
General
reinstalled or if replacement of parts is necessary.
Table 9-1 lists allowable wear limits of engine
Table 9-1. Engine Wear Limits
Engine Part
Point of Measurement
Wear
Limit
Valve Guides ..................................
Length ............................................................
2-9/32
(intake and exhaust) .......................
Outside Dia. ...................................................
5645/5635
Stem Hole Dia................................................
3167/.3157
Wear Limits-Max. Dia ....................................
3182
Distance, Cyl. Block Contact
Face to Guide ................................................
7/8
Intake Valves ..................................
Stem Dia. .......................................................
3149/.3141
Wear Limits-Min. Dia .....................................
.3121
30
Seat Angle ....................................................
Stem Clearance Limits...................................
001/.0006
Wear Limits-Max. Cl . ....................................
.003
Desired Stem Clear .......................................
.0008
Exhaust Valves ...............................
Stem Dia. .......................................................
3132/.3124
Wear Limits-Min. Dia. ....................................
.3104
45
Seat Angle .....................................................
Stem Clearance-Limits ..................................
.0047/.0043
Wear Limits-Max. Cl. .....................................
.0063
Desired Stem Cl.............................................
.0035
Valve Springs..................................
Outside Dia. ...................................................
31/32
Length-Valve Closed......................................
1-45/64
Load-Valve Closed.........................................
47-53#
Wear Limits-Min. Wgt. ...................................
42#
Length-Valve Open .......................................
1-27/64
Load-Valve Open ...........................................
96-104#
Wear Limits-Min. Wgt. ...................................
86#
Camshaft .......................................
Brg. Journal Dia. #1 .......................................
1.8095/1.8085
........................................................
#2 ...........................................
1.7465/1.7457
........................................................
#3 ...........................................
1.2475/1.2465
........................................................
Bushing-Inside Dia. #1...................................
1.8125/1.8115
........................................................
#2 ...........................................
1.7502/1.7495
........................................................
#3 ...........................................
1.2505/1.2495
........................................................
Bushing-Clearance Limits ..............................
004/.002
........................................................
End Play
...........................................
007/.003
9-1

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