Stihl MS 661 Manual page 30

1
: Remove the cylinder gasket (1).
1
2
: Inspect the manifold (1) and
replace it if necessary – even
very minor damage can result in
engine running problems, b 3.7
: Loosen the screw (2) and
remove the manifold (1).
A new manifold comes with the
washer already installed.
1
2
: Inspect the washer (1) in the
manifold (2), remove and replace
if necessary – a damaged
washer must be replaced.
– Clean the sealing faces, b 16
MS 661, MS 661 C-M
All sealing faces must be in perfect
condition. Always replace
components with damaged sealing
faces.
Always use a new cylinder gasket
when re-installing the cylinder.
Installing
– Coat the inside of the manifold
with STIHL press fluid, b 16
: Insert new washer (1) through
larger diameter of manifold (2) as
shown.
: Position the washer (1) so that it
is properly seated (arrows).
4
2
1
– Coat the inside of the manifold
flange with STIHL press fluid,
b 16
Washer must be installed in
manifold.
: Push the manifold (1) onto the
intake port so that the tab (2)
1
engages the web (arrow) – take
care not to displace or damage
the washer in the manifold.
: Fit the hose clamp (3) – the
screw (4) must be next to the
rib (5).
: Tighten down screw (4) until
distance 'a' is about 4 - 5 mm –
do not tighten as far as stop.
1
3
4
5
2
29