© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
26. Vacuum and Pressure Test of Crankcase
A two-stroke engine needs an air tight crankcase since the air
fuel mix is coming through the crankcase on the way to the
combustion chamber
Test to verify that there are no leaks at places like gaskets or
RTV silicone sealed mating surfaces, and that crankshaft seals
are not leaking under pressure or vacuum
Block off the exhaust port
by slipping a rubber block
off plate in between the
cylinder and the adapter
plate, then install spacers
and snug up the nuts
while pulling the rubber up
to get a complete seal
© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
26. Vacuum and Pressure Test of Crankcase
The Service Manual for each
model describes how to do
this test and gives the part
number for the adapters
For the 1130 saw the special
adapter for the carb side is
part number 1118 850 4200
Be sure the spark plug is
installed and tight
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