Leakage Test - Stihl MS 240 Instruction Manual

1
: Place the heat shield (1) in
position (if fitted) and use the
indentations (arrows) to line it up
on the sealing face of the cylinder
exhaust port.
1
: If the heat shield is fitted, position
the gasket (1) between the
projections (arrows)
– the gasket is now held in
position.
– Versions without heat shield:
Place gasket (1) on the cylinder
exhaust port, the raised edge
must face the port and the holes
must be in alignment.
32
2
1
– Carefully place the muffler (1) in
position.
: Line up the screws (arrows) and
check the position of the gasket.
: Insert screws (2) to hold the
muffler in position.
: Insert screws (arrows) and
tighten them down firmly.
1
– Remove the screws used to hold
the muffler in position.
: Attach tab (arrow) of the exhaust
casing (1) to the muffler first and
then swing it into position.
2
: Insert screws (arrows) and
tighten them down firmly.
– Tightening torques, b 3.5
8.2

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 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.
Always perform the vacuum test
first and then the pressure test.
The engine can be checked
thoroughly for leaks with the pump
0000 850 1300.
MS 240, MS 260, MS 260 C
1