Polaris 850 SKS 155 2020 User Manual

3
9850060 R02 - 2020-2021 850 AXYS™ Long Track Snowmobile Service Manual
© Copyright Polaris Inc.
3.1
ENGINE / COOLING / EXHAUST
CHAPTER 3
ENGINE / COOLING / EXHAUST
GENERAL INFORMATION. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . .. .. . . .. . . .. . . .. . . .. . ... . ... . . .. . . .. . . .. . 3.4
TORQUE SPECIFICATIONS - ENGINE ... . .. . . .. . . .. . . .. . . .. . . ... . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . 3.4
SERVICE SPECIFICATIONS . .. . . .. . . ... . ... . ... . .. . . .. . . .. . . .. . . ... . ... . .. . . .. . . .. . . .. . . .. . . ... . .. . . . 3.5
IMPORTANT ENGINE SERVICE NOTES . . .. . . .. . . .. . . .. . . ... . ... . .. . . .. . . .. . . .. . . .. . . ... . .. . . .. . . .. . . 3.6
SPECIAL TOOLS . ... . ... . .. .. . ... . ... . ... . .. . . ... . ... . ... . ... . ... . .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. . . 3.7
ELECTRONIC OIL PUMP ... . ... . ... . ... . ... . .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. . . ... . ... . ... . .. . . .. . . .. . . 3.9
ELECTRONIC OIL PUMP MOUNTING .. . . .. . ... . .. .. . . .. . . .. . ... . ... . ... . ... . . .. . . .. . ... . ... . ... . ... . . 3.9
ELECTRONIC OIL PUMP - FLOW OFFSET IDENTIFICATION.. . . .. . . .. . . .. . .. .. . . .. . . .. . . .. . ... . ... . .. 3.9
OIL PUMP LINE CONNECTIONS . . .. . . ... . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . .. .. . . .. . . .. . . .. 3.11
OIL CHECK VALVE FITTING HOSE CLAMP POSITION . ... . ... . ... . ... . . .. . ... . ... . .. . . ... . ... . ... . ..3.13
OIL SUPPLY HOSE ROUTING.. . . .. . . .. . . .. . .. .. . . .. . . .. . . .. . ... . ... . ... . . .. . . .. . . .. . ... . ... . ... . ... .3.14
OIL INJECTOR CHECK VALVES.. . ... . .. .. . . .. . . .. . ... . ... . ... . ... . . .. . . .. . ... . ... . ... . ... . ... . . .. . ..3.15
EXTERNAL OIL INJECTOR CHECK VALVE REPLACEMENT . . ... . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. .3.15
CROSS SHAFT OIL GALLERY OUTLET CHECK VALVE . ... . . .. . . .. . ... . ... . ... . ... . ... . ... . ... . ... . .3.16
CROSS SHAFT OIL GALLERY OUTLET CHECK VALVE TESTING . . . .. . . .. . ... . ... . ... . ... . ... . . .. . ..3.17
CROSS SHAFT OIL GALLERY OUTLET CHECK VALVE REPLACEMENT.. . . .. . . .. . . .. . . .. . . .. . . .. . ..3.17
ELECTRONIC OIL PUMP - RESISTANCE CHECK .. . .. .. . . .. . ... . ... . ... . ... . ... . . .. . ... . ... . ... . ... .3.23
ELECTRONIC OIL PUMP PRIME PROCEDURE . . .. . . .. . . .. . . .. . . .. . ... . . .. . . .. . . .. . . .. . . .. . ... . ... . .3.23
ELECTRONIC OIL PUMP MANUAL PRIME PROCEDURE . . .. . . .. . . .. . . ... . ... . ... . .. . . .. . . .. . . .. . . ..3.25
DIGITAL WRENCH - ELECTRONIC OIL PUMP FLOW OFFSET . .. . . .. . . .. . . ... . ... . .. . . .. . . .. . . .. . . ..3.26
ELECTRONIC OIL PUMP – TROUBLE CODES / PROTECTION MODE . . ... . ... . .. . . .. . . .. . . .. . . ... . .3.28
CRANKCASE WEEP HOLE. ... . ... . .. . . .. . . .. . . ... . ... . ... . .. . . .. . . .. . . .. . . ... . ... . .. . . .. . . .. . . .. . . ..3.28
OIL TANK . . . .. . . .. . . .. . . .. . ... . ... . . .. . . .. . . .. . . .. . . .. . ... . ... . .. .. . . .. . ... . ... . ... . ... . ... . . .. . ... . ... . .3.29
OIL TANK ASSEMBLY VIEW. .. . . .. . . .. . . .. . . .. . . ... . .. . . .. . . .. . . .. . . .. . . .. . . ... . .. . . .. . . .. . . .. . . .. . . .3.29
OIL TANK REMOVAL . . ... . . .. . ... . ... . ... . ... . ... . ... . ... . ... . ... . .. . . ... . ... . ... . ... . ... . .. . . .. . . .. .3.30
OIL TANK INSTALLATION . . ... . ... . .. . . ... . ... . ... . ... . ... . .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. . . ... . ..3.31
ENGINE SERVICE . .. . . ... . ... . .. . . .. . . .. . . .. . . .. . . ... . .. . . .. . . .. . . .. . . .. . . .. . . ... . .. . . .. . . .. . . .. . . .. . . .3.32
ENGINE REMOVAL .. . . .. . . .. . ... . ... . ... . ... . .. .. . ... . ... . .. . . ... . ... . ... . ... . ... . .. . . .. . . ... . ... . ..3.32
ENGINE INSTALLATION.. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . .. .. . . .. .3.39
850 ENGINE . . .. . ... . ... . ... . ... . . .. . . .. . ... . ... . ... . ... . ... . . .. . ... . ... . ... . .. . . ... . ... . ... . ... . ... . .. . .3.47
ENGINE MODEL NUMBER MATRIX - 2020 .. . ... . ... . ... . ... . .. . . ... . ... . ... . ... . ... . .. . . .. . . ...3.47
ENGINE MODEL NUMBER MATRIX - 2021 .. . ... . ... . ... . ... . .. . . ... . ... . ... . ... . ... . .. . . .. . . ...3.47
ENGINE SPECIFICATIONS. . ... . ... . ... . ... . .. . . .. . . .. . . ... . ... . ... . .. . . .. . . .. . . .. . . ... . ... . .. . .3.47
COMPONENT TORQUE SEQUENCES . . ... . ... . ... . ... . ... . ... . ... . .. . . ... . ... . ... . ... . ... . .. . .3.48
COMPONENT ORIENTATION VIEWS .. . . .. . . .. . . ... . ... . ... . .. . . .. . . .. . . .. . . ... . ... . .. . . .. . . .. .3.52
CRANKCASE SEALANT PATH . . . .. . . .. . . .. . . .. . . .. . . .. . .. .. . . .. . . .. . . .. . . .. . ... . ... . .. .. . . .. . ..3.53
CYLINDER ASSEMBLY VIEW .. . ... . ... . ... . .. . . .. . . .. . . ... . ... . ... . .. . . .. . . .. . . .. . . ... . ... . .. . .3.55
CRANKCASE ASSEMBLY VIEW.. . . .. . . .. . . .. . .. .. . . .. . . .. . . .. . ... . ... . ... . .. .. . ... . ... . ... . ... .3.56
PISTON & CRANKSHAFT ASSEMBLY VIEW. . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . ... . . .. . . .. . . .. .3.57
STATOR / FLYWHEEL ASSEMBLY VIEW . . .. . . .. . ... . .. .. . . .. . . .. . . .. . ... . ... . ... . . .. . . .. . . .. . ..3.58
ENGINE MOUNT ASSEMBLY VIEW . . .. . . .. . . .. . . .. . . .. . . ... . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. .3.59

Polaris 850 SKS 155 2020 Specifications

General

Brand	Polaris
Model	850 SKS 155 2020
Category	Snowmobiles
Language	English