Leakage Test; Preparations - Stihl 088 Owner's Manual

- Install a new exhaust gasket.
• Attach clip (1) to retainer (2).
- Tightening torques - see 2.6.
STIHL 088
4.2

Leakage Test

Defective oil seals and gaskets or
cracks in castings are the usual
causes of leaks. Such faults allow
supplementary air to enter the engine
and thus upset the fuel-air mixture.
This makes adjustment of the
prescribed idle speed difficult, if not
impossible.
Moreover, the transition from idle
speed to part or full throttle is not
smooth.
The crankcase can be checked
thoroughly for leaks with the
carburetor and crankcase tester and
the vacuum pump.
4.2.1

Preparations

- Remove decompression valve
- see 4.8.
• Install plug (1) 1122 025 2200
and tighten to 14 Nm (10.3 Ibf.ft).
• Check that spark plug (2) is
properly tightened down.
- Remove the muffler - see 4.1.
- Remove the carburetor
- see 10.2.1.
- Set the piston to top dead center
(T.D.C.). This can be checked
through the intake port.
• Check that sleeve is in position.
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