BRP-Rotax
Maintenance Manual
72-00-00
page 86
May 01/2007
Effectivity 912/914 Series
Edition 1 / Rev. 0
d02622
Nullhakenring /
circlip
piston centre
Kolbenmitte
1mm / 0,394 in
Bolzenmitte
pin centre
3.16) Piston and cylinder assembly fitting
3.16.1) Hydraulic valve tappets fitting
Lubricate bearing bore for hydraulic valve tappets in crankcase. Apply
LOCTITE Anti-Seize to the contact surfaces of the hydraulic valve
tappets, lubricate their circumference and insert them into the crank-
case according to the recorded position . The hydraulic valve tappet
must be able to turn in the crankcase without resistance.
3.16.2) Pistons fitting
See Figs. 72-99, 72-100, 72-101, 72-102, 72-103 72-104 and 72-105.
The piston pin center is offset from the piston center. During installation
of the piston, the arrow (1) on the piston crown must point toward the
propeller shaft. This means that on cylinders 1 and 3, the offset
(narrower side (2)) faces downwards, while on cylinders 2 and 4, the
offset (narrower side (3)) faces upwards.
Install the piston as shown on Fig. adjacent the offset of the piston pin
bore is 1 mm (0.039 in.).
If the arrow (1) on the piston crown is no longer visible, the piston must
be measured.
Fig. 72-100
00303
04709
1
Fig. 72-99
1 mm
Kolbenachse
Bolzenachse
piston axis
pin axis
0,0394 in
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