1985 Ski-Doo snowmobile Service Manual, Page 59Get this manual
Section 02 ENGINE Sub-section 03 (377 ENGINE TYPE)
8 7077 12
Hex nut 1118 (51 Distance nut M8 27,5 (3) Washer (8) Cvlmder head 12) Gasketcvlinder head (21 Support damper1) Cvlinder (2) Gasketintake manifold (4) Intake manifold 17) Lock washer mm (2) Hexscrew M840 12) Lock washer mm (2)
13 He screw flf8 )( 7" (21 14 He screw M6 2b (2)
1:' Lock washer 6
17 18 19 20 21 22 23 24
nlln 121
TOLERANCES WEAR LIMIT O'USURE
08 mm 10031 " 05 rTIm 10020"} 20 rTIrn 10079"} 20 rnm 10079"} 10 mm 10394")
16 Inrake cover II
Rubber rmg 11 Gasketcylmder flangO' 121 Seml-trapez rmg 121 Rectangular rmg (2) Pistcn (2) Gudgeon pm 12) Circlip (4) Needle cage 121
CLEANING
Discard all gaskets Clean all metal components in non-ferrous metal cleanerScrape off carbon formation from cylinder exhaust port, cylinder head and piston dome using wooden spatulaMEASUREMENTS