Engine; Muffler - Stihl MS 231 Manual

6.

Engine

6.1

Muffler

Always check and, if necessary,
repair the fuel system, carburetor,
air filter and ignition system before
looking for faults on the engine.
– Troubleshooting, b 3.7
– Remove the shroud, b 6.4
Before removing the muffler, set the
piston to top dead center to ensure
that no dirt falls into the cylinder.
1 1
: Pry out the plugs (1)
– do not re-use plugs that have
been removed.
2
1 1
: Take out the screws (1).
: Remove the muffler (2), check
and replace if necessary.
– Remove the exhaust gasket
– always install a new exhaust
gasket.
32
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– Remove and install the spark
arresting screen, if fitted – see
instruction manual.
Installing
– Cover the exhaust port. Remove
any dirt from around the cylinder
and exhaust port.
: Check and clean the sealing
faces (arrows), remove any
gasket residue – make sure there
is no gasket residue or dirt in the
exhaust port.
Always replace components with
damaged sealing faces.
1
– Position the new exhaust
gasket (1) so that the
tabs (arrows) point towards the
cylinder.
: Fit the new exhaust gasket (1)
and use the tabs (arrows) to line
it up on the cylinder.
1
2 2
: Carefully place the muffler (1) in
position.
: Check the position of the gasket
and fit the screws (2).
: Insert and tighten down the
screws (2) firmly.
– Use a blunt tool to push home the
new plugs squarely and uniformly
– take care not to damage the
plugs.
MS 231, MS 231 C, MS 251, MS 251 C