Introduction
Valve
Clearance
(Cold)
in
0.006 0.006
Intake (mm)
(0.15) (0.15)
Exhaust
in
0.006
0.006
(mm)
(0.15)
(0.15)
KNOW
YOUR
ENGINE
Study this manual carefully and comply with each of
Always use this number and the engine serial
number when making reference to your engine.
G
*
the warnings and cautions. Maintain the engine
according to the maintenance schedule. Operating
the engine properly and performing regular mainte-
nance can result in longer engine life, better perfor-
mance and
safer
operation. Regularly scheduled
maintenance lowers operating costs.
Figure
1
shows the locations
of
the components
referred to in this manual.
If
a
major repair
or
an overhaul is necessary, Onan
recommends the work be done by a Gompetent
mechanic to see that all dimensions, clearances,
and torque values are within the specified toler-
ances.
An engine service manual is available at additional
cost. Contact your nearest authorized dealer or
ENGINE MODEL REFERENCE
Onan Parts ani Service Center.
Identify your model by referring to the
MODEL
and
SP€C/F/CAT/ON
number as shown on the engine
nameplate (Figure
1).
This manual contains the SI metric equivalents
shown in parentheses immediately after the
U.S.
customary units of measure.
TABLE
1.
SPECIFICATIONS
Unit
of
Series
SPECIFICATION
Measure
El
25V
El
4QV
Numbers
of
Cylinders
1
1
~
in
3.31
3.31
I
I
Stroke
(70.0)
in
2.76
(mm)
(70.0)
1
Displacement
(389)
23-7
I
cu
in
23.7
(cm3) (389)
I
Compression Ratio 8.5
to
1
8.5 to
1
I
Power
at
Rated
Speed
(3600
rpm)
BHP
(kw)
(1
0.4)
12.5
(9.3)
Oil
Capacity
With Filter
QtS
(liter)
il
I
Spark
Gap
(0.89)
0.035
I
in
0.035
(mm) (0.89)
I
Ignition
Timing
~~
BTDC
230
230
I
2
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