2.12
9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
ENGINE
COMPRESSION AND LEAKDOWN TEST
NOTICE
This Polaris 4-Stroke engine is equipped with an
automatic decompressor. Compression readings will
vary in proportion to cranking speed during the test.
Average compression (measured) is about 80-120 psi
during a compression test.
Smooth idle generally indicates good compression. Low
engine compression is rarely a factor in running condition
problems above idle speed. Abnormally high
compression can be caused by a decompressor
malfunction, or worn or damaged exhaust cam lobes.
Inspect camshaft and automatic decompression
mechanism if compression is abnormally high.
A cylinder leakage test is the best indication of engine
condition on models with automatic decompression.
Follow manufacturer’s instructions to perform a cylinder
leakage test (never use high pressure leakage testers as
crankshaft seals may dislodge and leak).
Cylinder Compression
80 - 120 PSI
Cylinder Leakage
Service Limit: 10%
Inspect for cause if leakage exceeds 10%
ENGINE OIL LEVEL
Access the oil dipstick and fill tube from the right side of
the vehicle. A rising oil level between checks in cool
weather driving can indicate contaminants such as gas
or moisture collecting in the crankcase. If the oil level is
over the full/safe mark, change the oil immediately.
1. Set machine on a level surface.
2. Clean the area around the dip stick.
3. Remove dipstick and wipe dry with a clean cloth.
4. Reinstall dipstick completely.
NOTICE
The dipstick must be screwed completely in to ensure
accurate measurement.
5. Remove dipstick and check the oil level. The oil level
should be between the top line and the bottom line on
the dipstick. Add oil as indicated by the level on the
dipstick. Do not overfill.
NOTICE
Rising oil level between checks in cool weather driving,
can indicate moisture collecting in the oil reservoir. If
the oil level is over the full mark, change the oil.
OIL AND FILTER CHANGE
Oil Filter Torque:
Lubricate oil filter gasket with engine oil
Turn by hand until filter gasket contacts sealing
surface, then turn an additional 3/4 turn
Oil Filter Wrench:
PV-50105
Recommended Engine Oil:
Polaris PS–4
Synthetic 5W-50
NOTICE: Care must be taken to ensure that the fluids
are contained. Be prepared to collect the fluid with
suitable containers before opening any compartment
or disassembly of any component containing fluids.
CAUTION
Personal injury can occur when handling used oil. Hot
oil can cause burns or skin damage.
MAINTENANCE
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