Stihl TS 500i - Spark Plug

42 TS 500i
6. Engine
6.1 Muffler / spark arresting
screen
– Refer also to troubleshooting
chart, b 3.5
– Remove the "cast arm with
guard", b 4.2
To keep dirt particles from entering
the cylinder, move piston to top
dead center before removing the
muffler.
: Take out the screws (arrows)
: Take out and examine the
muffler (1), replace if necessary
: Remove the muffler gasket (1)
and cooling plate (2)
1
370RA083 TG
2
1
370RA084 TG
– Installing and removing the spark
arresting screen, see Instruction
Manual
– Cover exhaust bore and remove
any fouling on the cylinder and
exhaust bore
: Examine and clean the mating
surfaces (arrows) on the exhaust
bore, cooling plate and muffler,
remove any gasket residues if
necessary – there must not be
any gasket residues or dirt
particles in the exhaust bore,
b 13
Parts with damaged mating faces
must be replaced.
: Fit cooling plate (1) and muffler
gasket (2) to muffler (3) and
insert screws (4) into cooling
plate
– Muffler gasket and cooling plate
are held in place on the muffler
370RA086 TG
1307RA062 TG
1
2
3
4
: Carefully fit muffler (1) with
muffler gasket and cooling plate
: Fit the screws (arrows) and check
that the cooling plate and gasket
are correctly positioned
: Insert the screws (arrows) and
tighten them according to
specifications, b 2.5
6.2 Leak testing
Defective oil seals and gaskets or
cracks in housing are the usual
causes of leaks. Such faults allow
supplementary air to enter the
engine and upset the fuel-air
mixture.
This can above all affect the idle
speed.
Moreover, it is possible that the
transition from idle speed to part or
full throttle is not smooth.
Always start with the vacuum test
and then continue with the pressure
test.
The engine can be thoroughly
checked for leaks under vacuum
and at gauge pressure using the
pump 0000 850 1300.
1
370RA088 TG