Stihl MS 390 User Manual

35MS 290, MS 310, MS 390
– Fit the snap rings so that their
gaps are on the piston's vertical
axis (they must point either up or
down – see arrow).
– Install the piston, b 6.5.1
209RA107
VA
Install all other parts in the reverse
sequence.
– Pull the piston out of the cylinder,
b 6.5.1
– Remove rings from the piston.
: Use a piece of old piston ring to
scrape the grooves clean.
VA
135RA095
: Install the new piston rings in the
grooves so that the radii face
upward.
– Install the piston, b 6.5.1
VA
135RA096
– Remove the piston, b 6.5.2
: The crankshaft (1) and
connecting rod (2) form an
inseparable unit. This means the
crankshaft must always be
replaced as a complete unit.
VA
135RA097
2
1
When fitting a replacement
crankshaft, always install new ball
bearings, oil seals and needle
bearing.
: Pull off the oil seals (1) and ball
bearings (2).
Install in the reverse sequence.
6.6 Piston Rings 6.7 Crankshaft

Stihl MS 390 Specifications

General

Brand	Stihl
Model	MS 390
Category	Chainsaw
Language	English