1984 Ski-Doo Shop Manual, Page 14Get this manual
SECTION 01 TOOLS
SUB-SECTION 02 (SERVICE TOOLS)
Polyamid ring pusher engine 277 MAG 420 276 930 PTO 420 276 940
To install polyamid ring in crankcase
277 engine
Crankshaft feeler gauge 377, 447503 engines PTO 420 876 620