Introduction
This manual covers servicing the Kohler lOHP 241 Sand 12HP 301 S engines. There are
some minor differences between these engines such
as the bore and stroke. The difference
will be indicated in the manual when they appear. These engines are of the 4 cycle type,
splash oil lubrication, cast iron block
and electric starting.
1#/JOffTANT
REFER TO THE SPECIFICATIONS SECTION OF THIS MANUAL FOR
DIMENSIONS, TOLERANCES,ETC. WHEN SERVICING THIS ENGINE.
THESE DATA ARE NOT INCLUDED IN THIS SECTION.
CHECKING COMPRESSION PRESSURE
Should you receive a service complaint dealing with excessive oil consumption, loss of
power, hard starting, rough running or excessive smoke, check the compression pressure
and the crankcase vacuum.
1. Steam clean engine thoroughly.
2. Warm up engine to operating tempera-
ture.
3. Remove the spark plug and shut off
the fuel valve.
4. With the speed control lever in neutral
or brake position, use
a compression
gauge similar to thatshowninfigureM-1.
5. Crank the engine with the starter and
check the compression pressure, refer to
Specification Section.
If the pressure is 20
PSI or more below the specified pressure,
leaking valves or excessive ring clearance
is indicated.
Figure M-1
CHECKING CRANKCASE VACUUM
The crankcase breather maintains a par-
tial vacuum in the crankcase.
To check
vacuum proceed as follows:
1. Drill and tap a 1/8" NPT in a 3/4" pipe
plug or use a
1/8" to 3/4" pipe reducing
bushing. Install in place of the engine oil
dipstick and plug.
2. Attach vacuum
gauge to pipe plug, Figure
M-2. Start engine and
run at low idle
speed. Refer to Specification Section for
proper vacuum.
No or low vacuum indicates a faulty breather,
excessive blowby, leaking valves
or worn
oil seals.
Figure M-2
M-3
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