Front Chain Tensioner; Side Chain Tensioner - Stihl 029, 039 Service Manual

STIHL 029, 039
3.4 Front Chain
Tensioner
Top:
1 = Adjusting screw
2 = Adjusting nut
Bottom:
Removing cover
- Remove chain sprocket cover.
- Unscrew the adjusting nut by
rotating the adjusting screw.
- Take the adjusting screw out of
the cover and housing.
- Pull the cover out of the engine
housing.
a = 19.5 mm (0.77")
b = 1.7 mm (0.07")
c = ∅ 10 mm (0.4")
Note: The front chain tensioner can
be converted to a side chain
tensioner - see 3.5.
In the case of a coversion from
front to side chain tensioner, it is
necessary to drill a hole in the
sprocket cover to take the peg of the
spur gear - see dimensions in
illustration.
Reverse the above sequence to
install the chain tensioner.
3.5 Side Chain
Tensioner
Top:
Cover mounting screw
Bottom:
Removing the chain tensioner
- Remove the chain sprocket cover.
- Take out the cover mounting
screw.
- Pull the chain tensioner assem-
bly out of the engine housing.
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