Engine; Removing And Refitting Exhaust Muffler - Stihl 064 Service Manual

STIHL 064, 066

ENGINE

4.
4.1 Removing and Refitting
Exhaust Muffler
Top:
Upper casing mounting screws
Bottom:
Lower casing mounting screws
Troubleshooting chart - see 2.2.
- Take out the upper casing mount-
ing screws and remove upper
casing.
- Take out the lower casing mount-
ing screws and remove lower
casing.
Top:
Removing exhaust gasket
Bottom:
1 = Retaining tabs
2 = Spark arrestor screen
- Remove the gasket and flange,
if fitted.
- Inspect the spark arrestor
screen, if fitted. If necessary,
bend back the retaining tabs
and pull out the screen.
- Clean the spark arrestor screen
or fit a new one.
1 = New muffler
2 = Gasket
3 = Flange
4 = Gasket
5 = Cylinder (original version)
Reassemble in the reverse sequence.
Important: A modified cylinder (with
extended exhaust flange) is installed from
machine number X 18 760 750. A gasket and
flange are required to fit a new muffler on an
original-type cylinder.
Only the new version of the muffler may be
fitted to the new cylinder.
Note: Fit a new exhaust gasket. Coat threads
of screws with Loctite, see 12.2. Tighten
screws of original-type lower casing to 10 Nm
(7.5 Ibf.ft) and screws of new version to
15 Nm (11.0 Ibf.ft). Tighten screws of upper
casing to 8 Nm (5.9 Ibf.ft).
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