Cylinder Head Installation - Polaris Sportsman 400 Service Manual

CYLINDER INSTALLATION, CONT.
7. Apply a light film of oil to the threads and flange
surface of the cylinder mounting bolts.
8. Install all four bolts finger tight. Rotate the engine and
position the piston at BDC.
NOTE: If cam chain is installed, hold it up while rotating
the engine to avoid damage to the chain, drive sprocket
teeth, or tensioner blade.
9. Tighten the cylinder bolts in three steps in a criss cross
pattern and torque to specifications.
10. Install the two 6mm bolts.

CYLINDER HEAD INSTALLATION

Clean the gasket surfaces on the cylinder head and cylin-
der. Remove all traces of old gasket material.
Refer to disassembly photos.
1. Install the cam chain tensioner guide. Be sure bottom
end of guide is located properly in crankcase.
2. Install the two dowel pins and a new cylinder head
gasket.
3. Place the cylinder head on the cylinder. Apply a film of
engine oil to the cylinder head bolt threads and
washers, and hand tighten the bolts.
The following procedure must be used to torque the
cylinder head properly:
Torque all bolts evenly in a criss cross
pattern
*Torque bolts to 22 ft. lbs. (3.04 kg-m)
*Torque bolts to 51 ft. lbs. (7.04 kg-m)
*Loosen bolts evenly 180° (1/2 turn)
*Loosen bolts again another 180° (1/2
turn)
*Torque bolts to 11 ft. lbs. (1.52 kg-m)
*From this point, tighten bolts evenly
90° (1/4 turn)
*Finally, tighten another 90° (1/4 turn)
*Install two 6mm bolts and torque to 6
ft. lbs. (.828 kg-m)
- projex@inbox.lv -
Cylinder Bolt Torque:
10mm - 46 ft. lbs. (6.348 kg-m)
6mm - 6 ft. lbs. (.828 kg-m)
ENGINE
Guide in
recess
3.67