Polaris 2001 High-Performance Snowmobile Service Manual (PN 9916690), Page 57Get this manual
ENGINE When tightening bolts, nuts, or screws, torque pattern should be followed to insure uniform equal tension is applied to all fastenersProper torque application prevents fasteners from loosening or breaking in critical serviceIt also minimizes wear and eliminates premature or needless repair costsFollowing uniform torque application sequence patterns assures optimum performance from precision machined, close tolerance assembliesOn vital engine parts, torquing negligence could be costlyTorque is force which tends to produce rotationThe measurement of this force is expressed in units of force and lengthThere are at present two basic systems of units used to express torque, English and MetricIn the English system, the units of force are the pound or ounce, and the length is the foot or inchIn the Metric system, the unit of force is expressed in grams (gm) or Newton meters (Nm), and length as centimeters (cm) or meters (m)The most common units of torque in the English system are ftlband inlbIn the Metric system, torque is commonly expressed in units of NmMultiply foot pounds by 1.382 to obtain NmSee page 2.3 for engine torque sequences Engine EC-45 S44 SN60-44 SN50 SN60-70 SN70 SN80 EC79PL Cylinder Head 18-19 ftlbs(25-26.5 Nm) 20-24 ftlbs(2833 Nm) 18-22 ftlbs(2530 Nm) 18-19.5 ftlbs(25-27 Nm) Cylinder Base Nuts 24-28 ftlbs(33-39 Nm) 30-34 ft.lbs (42-47 Nm) 30-34 ft.lbs (42-47 Nm) 23-25 ftlbs(32-35 Nm) Crankcase mm 17-18 ftlbs(22-23 Nm) 20-24 ft.lbs(2833 Nm) 20-24 ft.lbs(2833 Nm) 20-22 ftlbs(28-30 Nm) Crankcase 10 mm 23-25 ftlbs(32-35 Nm) NA Flywheel 60-65 ftlbs(83-90 Nm) 90 ftlbs(124 Nm) 90 ftlbs(124 Nm) 60-65 ftlbs(83-90 Nm)