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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

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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

Stihl MS 18 User Manual

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