1978 Ski-Doo Shop Manual, Page 171Get this manual
SECTION 04 SUB-SECTION 02, (ENGINES)
ROTARY VALVEWATER PUMP
CLEANING
Discard all oil seals and "0" ringsClean all metal components in non-ferrous metal cleaner1978354 type: 131 BTDC opening 520 ATDC closing
Using angle finder, mark crankcase at 131 from bottom edge of magneto side inlet port
DISASSEMBLYASSEMBLY
(DTorque to 20 N-m (15 ft-lbs)0Apply Loctite Lock'n Seal 242 on threads