Ski-Doo Formula 500 1998, Shop Manual

Page: 142 / 398

Section 04 ENGINE
Subsection 09 (ROTARY VALVE, COOLANT PUMP AND RESERVOIR)
04-09-2
NOTE: Some verifications can be performed with
engine in vehicle. Refer to ENGINE DIMENSION
MEASUREMENT 04-04.
GENERAL
Engine must be removed from vehicle to work on
rotary valve shaft/components. Refer to
Removal
and Installation of appropriate engine for proce-
dures.
Bottom end must be opened to remove rotary
valve shaft.
CLEANING
Discard all seals and O-rings.
Clean all metal components in a non-ferrous met-
al cleaner.
DISASSEMBLY
1,2, Screw and Rotary Valve Cover
NOTE: Before removing rotary valve, check valve
timing as described in Rotary Valve Timing at
the end of this subsection.
Unscrew 4 retaining screws and withdraw rotary
valve cover and valve.
3,17, Circlip and Pump Impeller
To remove rotary valve shaft assembly from
crankcase, first remove coolant pump impeller
and circlip on valve side. Using the suitable pusher
(P/N 420 8766 12) and a fiber hammer, push shaft
assembly.
8,9,10, Circlip and Spring Retaining Cup
If it is necessary to disassemble components of
rotary valve shaft assembly, compress spring re-
taining cup with rotary valve circlip tool (P/N 529
0291 00) in order to remove circlip. Remove gear
and distance sleeve then external circlip.
1. External circlip
2. Circlip
-
CAUTION
Bottom end must be opened to remove rota-
ry valve shaft.
-
CAUTION
To prevent damage to the end of the rotary
valve shaft, use pusher (P/N 420 8766 12).
A16C0NA
420 8766 12
A16C14A
529 0291 00
2
1