Stihl MS 251 Instruction Manual - Page 33

Engine, 6.1 Muffler, Always replace components - carburetor

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6. Engine 2310RA071 TG 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. - 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. 1 22 : 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. 2310RA069 TG 11 : Pry out the plugs (1) - do not re-use plugs that have been removed. 2310RA067 TG : Check and clean the sealing faces (arrows), remove any gasket residue - make sure there is no gasket residue or dirt in the exhaust port. - Use a blunt tool to push home the new plugs squarely and uniformly - take care not to damage the plugs. Always replace components with damaged sealing faces. 2 2310RA068 TG 2310RA070 TG 11 : Take out the screws (1). : Remove the muffler (2), check and replace if necessary. - Remove the exhaust gasket - always install a new exhaust gasket. 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. 32 MS 231, MS 231 C, MS 251, MS 251 C

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32
MS 231, MS 231 C, MS 251, MS 251 C
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.
:
Pry out the plugs (1)
– do not re-use plugs that have
been removed.
:
Take out the screws (1).
:
Remove the muffler (2), check
and replace if necessary.
–
Remove the exhaust gasket
– always install a new exhaust
gasket.
1
2310RA067 TG
1
1
2310RA068 TG
1
2
–
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.
–
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.
2310RA069 TG
2310RA070 TG
1
:
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.
2
2310RA071 TG
2
1