Bombardier SeaDoo 2001 factory shop manual, Page 160Get this manual
Section 04 ENGINE Subsection 07 (ROTARY VALVE)
If rotary valve cover clearance is over specified tolerances, machine rotary valve cover seating surface or replace the coverMACHINING INFORMATION The amount of material over tolerance must be removed from the rotary valve cover seating surfaceAlso cut the O-ring groove the same amount to keep the 1.00 0.03 mm (.039 .001 in) depth between the bottom of the groove and the seating surfaceRemove burrs on the edges of the seating surface and O-ring grooveBacklash must be even at all positionsOtherwise overhaul engine to find which part is faulty (gear, rotary valve shaft or crankshaft with excessive deflection)
DISASSEMBLY
Rotary Valve Cover
Unscrew retaining screws and withdraw rotary valve cover no1 and rotary valve no13
Rotary Valve Shaft
To remove the rotary valve shaft assembly, the engine must be removed from watercraft (refer to ENGINE)Open bottom end and remove crankshaft (refer to BOTTOM END)First remove snap ring no4 from crankcase1