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Cleaning and Inspection. - TM-5-4320-234-340066
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TM-5-4320-234-34 Pump Centrifugal Self-Priming Gasoline Engine Driven Wheel Mounted 6-Inch 1500 GPM Capacity At 60 Foot Head Manual
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Table 4-1. Engine fits, tolerances, and wear limits-continued - TM-5-4320-234-340068
TM 5-4320-234-34
CHAPTER 4
REPAIR OF ENGINE
Section I. INTRODUCTION
overspeed governor which grounds the magneto to shut
4-1. Description
down operation if engine speed exceeds a preset limit.
The engine is a six-cylinder, four-stroke-cycle, L-
4-2. Fits, Tolerances, and Wear Limits
head, in-line, water-cooled unit which is designed to run
Table 4-1 lists the fits and tolerances applicable to
on gasoline. It is pressure lubricated by a pump located
the engine. Refer to the table to determine if you must
in the oil pan. It uses magneto ignition and an electrical
replace parts or if continued serviceability of the parts is
starter. Engine speed is controlled by a variable speed
possible.
flyball governor.
The engine is protected by an
Table 4.1. Engine fits tolerances, and wear limits.
Manufacturers
Design clearances
Component points of measurement
dimensions in
in inches
Allowable
inches
wear or
clearance
Min.
Max.
Min.
Max.
Valve and valve guides.
Intake valves
Cylinder block face-to-guide distance
1-15/32
(3.6717 cm)
Outside diameter
0.6565
0.6575
(1.6412 cm)
(1.6437 cm)
Inside diameter
0.3422
0.3432
0.3447
(0.8555 cm)
(0.8580 cm)
(0.8617 cm)
Valve stem diameter
0.3406
0.3414
0.3386
(0.8515 cm)
(0.8535 cm)
(0.8465 cm)
Step to guide clearance
0.0008
0.0026
0.0046
(0.0020 cm)
(0.0065 cm)
(0.0115 cm)
Valve-to-tappet clearance
0.0140
(0.0350 cm)
Exhaust valves
Cylinder block face-to-guide distance
1.15/32
(3.6717 cm)
Outside diameter
0.6565
0.6575
(1.6412 cm)
(1.6437 cm)
Inside diameter
0.3422
0.3432
0.3447
(0.8555 cm)
(0.8580 cm)
(0.8617 cm)
Valve stem diameter
0.3377
0.3385
0.3357
(0.8442 cm)
(0.8462 cm)
(0.8392 cm)
Stem-to-guide clearance
0.0037
0.0055
0.0075
(0.0092 cm)
(0.0137 cm)
(0.0187 cm)
Valve-to-tappet clearance
0.0160 (Hot)
(0.0400 cm)
0.0170 (Cold)
(0.0425 cm)
Valve tappets
Outside diameter
0.9990
(2.4975 cm)
Tappet bore diameter
1.0000
(2.5000 cm)
Maximum bore-to-tappet clearance
0.0050
(0.0125 cm)
Camshaft and bushings
Bearing journal diameter
No. 1
1.8715
1.8725
1.8705
(4.6787 cm)
(4.6812 cm)
(4.6762 cm)
No. 2
1.8085
1.8095
1.8075
(4.5212 cm)
(4.5237 cm)
(4.5187 cm)
No. 3
1.7457
1.7465
1.7447
(4.3642 cm)
(4.3662 cm)
(4.3617 cm)
4-1

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