1970-1979 Ski-Doo Snowmobiles Service Manual, Page 93Get this manual
86 Table 1
Engine Assembly toFrame Engine Mount to Crankcase
CHAPTER FOUR
TORQUE SPECIFICATIONS
Intake Exhaust Manifold BoltNut
Crankcase BoltsNuts
Cylinder Head Nut
Magneto Nut
247" and 302
22-25 ftlb(3.0-3.5 mkg)
to 1973 50 ftlb(6.9 mkg) 1974 and later 23-29 ftlb(3.2-4.0 mkg)
16ftlb(2.2 mkg)
to 1973 50-56 ftlb16-18 ftlb(6.9-77 mkg) (0.8-25 mkg) 14-16 1974 and later 14-16 (1.9-2.2) to 1977 58-62 ftlb16-18 ftlb(8.0-86 mkg) (2.2-25 mkg) 1978 and later 12 ftlb(1.5 mkg) 14-16 ftlb(19-22 mkg)
16 ftlb(2.2 mkg)
245 and 345
22-25 ftlb(3.0-3.5 mkg)
to 1977 23-29 ftlb(3.2-4.0 mkg) 1978 and later 26ftlb(3.6 mkg) 23-29 ftlb(3.2-4.0 mkg)
16 ftlb(2.2 mkg) Allen cap screws to ftlb(1.0 mkg) 16 tt-lb(2.2 mkg) Bolts II12 ftlb(1.2 mkg)
16ftlb(2.2 mkg)
248 and 294
22-25 ftlb(3.0-3.5 mkg)
15 It-lbto 1977 to1973 12-17 ftlb(2.1 mkg) 42-50 ftlb(58-6.9 mkg) (1.7-2.3 mkg) 1978and later 1974 and later 42-50 It-lb46ftlb(64 mkg) (5.8-6.9 mkg) to 1977 to 1973 42-50 ftlb12-17 ftlb(58-69 mkg) (1.7-23 mkg) 1978 and later 1974 and later 60ftlb42-50 ftlb(8.3 mkg) (5.8-6.9 mkg) 58-62 ftlb(80-86 mkg) 70-72 fUb(9.7-100 mkg) NA 14-16 ftlb(1.9-2.2 mkg)