03-26
SECTION 03 - ENGINE PREPARATION
Position rotary valve on shaft splines to have edges
as close as possible to these marks with the MAG
piston at TDC.
NOTE:
When checking the timing with the MAG
side piston at Top Dead Center, the rotary valve
shaft should be lightly held in a clockwise position
to take up any gear lash that may be present. The
valve is asymmetrical and can be flipped over to
obtain a better timing position. There is a possibil-
ity that exact timing cannot be reached by this
method. When this occurs, the rotary valve shaft
may have to be removed and the gear reposi-
tioned. Refer to appropriate model year
Shop
Manual. By removing the rotary valve shaft and
reinstalling it with the drive gear in a different po-
sition with respect to the crankshaft gear and/or
valve shaft splines, a different valve position may
be established. When a crankshaft rotary valve
shaft, or drive gear is removed or replaced, it will
be necessary to reverify the timing.
Apply Sea-Doo injection oil on rotary valve surfac-
es before reassembling rotary valve cover.
– Remove TDC gauge.
Rotary Valve Cover Installation
Install O-ring and cover. When installing O-ring, do
not roll O-ring into groove. Instead, place O-ring in
groove until it becomes necessary to stretch it to
fit (about half way around diameter). Now pull O-ring
beyond cover and lay it into groove without twisting
or rolling O-ring; then, torque screws to 20 N•m
(15 lbf•ft) in a criss-cross sequence.
-
CAUTION
Crankcase halves must be separated and
crankshaft must not be present to install ro-
tary valve shaft assembly in crankcase.
Summary of Contents for Bombardier
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