2) Checking The Piston Ring - Rotax MMH-912 Series Maintenance Manual

3.13.2) Checking the piston ring

Effectivity 912/914 Series
Edition 1 / Rev. 2
BRP-Rotax
Maintenance Manual
See Figs. 72-88 and 72-89.
Check the end clearance of the cleaned piston rings.
To determine the end clearance (4), remove the piston rings from the
piston using piston ring pliers, clean them and insert into the cylinder.
Use a piston as pusher to align piston squarely in cylinder and
approx. 10 mm (0.395 in.) from the top edge. The end clearance is
measured using the feeler gauge (4), see dimension (PI07).
See 72-00-00 / 4.
By closely inspecting the ring surface (5), the portion of surface contact
can be seen and indicates the wear. Install piston rings using piston ring
pliers with the marking (6) "TOP" or the dot mark pointing upwards
towards the piston crown.
Fig. 72-88
Fig. 72-89
Rechteckring/rectangular ring
Minutenring/tapered compression ring
3
Ölabstreifring /
oil scraper ring
4
00294
Maß
PI07/
dim.
PI08/
PI09
top
top
00296
6
5
5
72-00-00
page 79
July 01/2008