1978 Ski-Doo Shop Manual, Page 72Get this manual
SECTION 02 SUB-SECTION 08 (GEARBOX)
NOTE: It is necessary to cut hole in fiberglass frame in order to be able to reach chain tensioner retaining bolts and nuts
Install assembled drive shaft into lower housing then using feeler gauge, check total free-play between components installed on the drive shaft side of sprocket Free-play must not exceed 0.15-0.30 mm (,006 to .012")If free-play is not within tolerance, shim to correct tolerance
Layshaft gear free-play:
upp:r tensioner retaininq bOlt