Polaris Sportsman 850 - Engine Doesnt Turn Over; Engine Turns Over, Fails to Start; Engine Backfires

3.68
CRANKSHAFT INSTALLATION
Refer to Crankcase Assembly (Upper) page 5.56, page
3.69.
1. Clean the bearing bore surfaces of upper crankcase
(main bearings), connecting rods and connecting rod
caps.
2. Align tab of a new main bearing
q
with the slot in
main bearing bore of crankcase
w
. Press bearing
insert firmly into place. Repeat for all main bearings,
connecting rods, and connecting rod caps.
3. Apply Premium Starter Grease (2871460) to each
main and rod bearing journal of crankshaft.
4. Loop cam chain over crankshaft sprocket.
5. Apply engine oil to new crankshaft seals and install
seals on both ends of crankshaft with spring side of
seal facing IN (toward crankshaft).
6. Carefully lower crankshaft into upper crankcase.
Guide connecting rods onto rod journals of
crankshaft as necessary.
7. Adjust crankshaft seals so each is flush with end of
crankcase.
8. Install rod caps on connecting rods with marks
aligned.
9. Install new connecting rod bolts (apply clean engine
oil to threads) and tighten evenly until snug.
10. Torque the bolts using the following procedure:
TORQUE
Connecting Rod Bolts:
Step 1: 9 ft-lb (12 Nm)
Step 2: 20 ft-lb (27 Nm)
Step 3: Tighten an add’n 90° (1/4 turn)
OIL PASSAGE TUBE
1. Replace O-rings (A) on both ends of the oil supply
tube.
2. Apply a light film of engine oil to O-rings.
3. Push oil tube into upper crankcase.
ENGINE / COOLING SYSTEM