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42 MS 270, MS 280

– Make sure the flange is properly

seated in the tank housing.

– Line up the cylinder.

 Fit the cylinder base screws and

torque down in a diagonal pattern

– see 3.5.

146RA062

 Install and tighten down the

decompression valve (1) firmly

(if fitted) – see 3.5.

146RA059

 Fit sleeve (1) in the manifold.

 Push the washer (2) onto the

studs.

Reassemble all other parts in the

reverse sequence.

146RA031

– Remove the piston – see 6.5.1.

– Remove the piston rings from the

piston.

 Use a piece of old piston ring to

scrape the grooves clean.

176RA091

 Install the new piston rings in the

grooves so that the radii at the

ends of the rings face upward.

– Install the piston – see 6.5.2.

176RA092

6.6 Piston Rings

Stihl MS 270 User Manual

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