Troubleshooting; Oil Pressure Test; Engine Cylinder Leakdown Test - Polaris RANGER 1000 2020 Service Manual

TROUBLESHOOTING

OIL PRESSURE TEST

1. Attach the Oil Pressure Gauge Adapter (PU-52492)
to the Oil Pressure Gauge (PV-43531).
2. Raise the dropbox to access the engine.
3. Clean the area around the oil gallery plug
in the upper crankcase on the MAG side of the engine
4. Remove the crankcase gallery plug and thread in the
oil pressure adapter. Torque the adapter to
specification.
TORQUE
PU-52492
22 ft-lbs (30 Nm)
5. Start engine and allow it to reach operating
temperature, monitoring gauge indication.
NOTICE
Test results are based on the use of the recommended
engine oil (Polaris PS-4 5W-50 Full Synthetic or PS-4
10W-50 Extreme Duty Full Synthetic) at operating
temperature, and may vary considerably if any other oil
is used or if engine is not up to temperature.
Oil Pressure Specification (Engine Hot):
Minimum @ Idle: 60 PSI
Minimum @ 6250 RPM: 67 PSI
6. Upon assembly, torque the crankcase gallery plug to
specification.
TORQUE
Crankcase Oil Gallery Plug:
22 ft-lbs (30 Nm)
9850045 R01 - 2020-2021 RANGER 1000 Service Manual
© Copyright Polaris Inc.

ENGINE CYLINDER LEAKDOWN TEST

OVERVIEW
A cylinder leakdown test used to determine the condition
of the engine by introducing compressed air into the
cylinder and measuring the rate at which it leaks out.
Leakdown primarily tests pistons and rings, valve
sealing, and the head gasket. A cylinder leakdown test is
q
the most accurate test to examine engine condition.
located
Leakdown testing is preferred over compression testing
• Piston rings take time to seat. Frequently a new
vehicle can have compression below the
specification because of the "Break-In" period and
can cause misdiagnosis.
• Elevation can cause variance in compression
causing compression specifications and testing to be
inaccurate.
• Restricted exhaust or intake can affect compression
and could give a false indication that the engine is
bad.
• Compression specification readings on the low end of
a range can cause technicians to suspect engine
faults and lead to misdiagnosis.
• Even after performing a compression test leakdown
will need to be performed to diagnose the root cause.
If a compression test is performed before, or in place of
a leakdown test, the results should always be
compared to other cylinders. If diagnosing an engine
with two or more cylinders, this must be compared to
the adjacent cylinder. If diagnosing a single cylinder
engine, this must be compared to a known good
For any additional information needed for testing refer to
the tester manufacturer's instructions. Never use high
pressure leakage testers as crankshaft seals may
dislodge and leak.
TESTING PROCEDURE
1. Warm up the engine to operating temperature.
2. Remove the spark plug from the cylinder being
tested.
Use caution when removing the spark plug as the
ENGINE / COOLING / EXHAUST
NOTICE
for the following:
IMPORTANT
engine.
WARNING
engine will be hot.
3
3.93