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SECTION Ill - SERVICE DATA
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3.1 GENERAL INFORMATIO.N
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To provide the best service for
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engines follow the factory recommended specifica-
tions, tolerances and clearances, torque data and
special tools.
The following data is applicable to
all 1959-1960 engine models.
Jacobsen engines can be disassembled and reas-
sembled
with
standard shop tools. However several
tools are recommended for particular functions of
repair:
A. Flywheel Knockout Nut - threads onto crank-
shaft to facilitate flywheel removal.
B. Timing Gage and Flywheel Holder - used to
RING
COMPRESSOR
J-100
J-125
J-175
J-225
SPARK
TESTER
J-100
J-125
CRANKSHAFT OIL
SEAL STARTER SLEEVES
set ignition timing and to lock piston at bot-
tom dead center for easy removal of starter
pawl assembly.
C. Oil Seal Starter Sleeve - use on crankshaft to
protect oil seal when removing or installing
back plate or crankcase head.
D. Large Wrist Pin Drift - use to remove and in-
stall wrist pin in piston.
E. Vibra-Tak - used to check RPM's of engine.
F. Ring Compressor - used to compress rings
when installing piston in cylinder.
G. Wico Test Plug - used to test magneto.
BALL
RETAINER
REMOVER
J-175
FLYWHEEL
KNOCKOUT
J-225
VIBRA-TAK
CLUTCH PLATE
RIVETING TOOL
TIMING GAUGE
AND FLYWHEEL
HOLDER
Figure
5. Special Tools
3. 2
s
PECIFICATIONS
J-125-H
J-175-H
J-100-H
J-125-V
J-175-V
J-225-V
Horse Power
2. 25
1. 8
2.25
3
4
Piston Displacement
4.71
4. 71
6. 206
7.95
Compression Ratio
5.5-1
5.5-1
5.5-1
5.333-1
.Cyl. Head Compression
80-85
80-85
85-90
85-90
Recommended Spark Plug
UJ-12
J-11-J
J-11-J
J-8-J
J-8-J
Stroke
1.500
1.500
1. 750
2.000
11
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