Engine Breather Hose; Engine Cylinder Leakdown Test - Polaris ACE 900 2017 Service Manual

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16. Unlock the dipstick lever
wipe it dry with a clean cloth.
17. Reinstall the dipstick to fully seat it. Do not lock the
dipstick.
IMPORTANT
Make certain the dipstick is inserted all the way down to
ensure an accurate reading.
18. Remove the dipstick and check the oil level.
19. Add the recommended oil as necessary to bring the
oil level within the SAFE range (between the holes)
on the dipstick. Do NOT overfill.
NOTE
A rising oil level between checks during cold weather
operation can indicate contaminants such as gas or
moisture collecting in the crankcase. If the oil level is
over the upper mark, change the oil immediately.
20. When finished, reinstall dipstick and lock the lever.
21. Reinstall the cargo box access panel, engine service
panel and seat.
22. Dispose of used oil and filter properly.
9929422 R02 - 2017-2019 ACE 900 Service Manual
© Copyright Polaris Industries Inc.
. Remove the dipstick and

ENGINE BREATHER HOSE

This engine is equipped with a breather valve
valve is located on the front of the engine. The valve
should only allow air to pass from the engine to the air
box and NOT from the air box to the engine. Replace as
necessary.

ENGINE CYLINDER LEAKDOWN TEST

A cylinder leak-down test is the best indication of engine
condition. Follow tester manufacturer's instructions to
perform a cylinder leak-down test. Never use high
pressure leakage testers as crankshaft seals may
dislodge and leak.
Cylinder Leakage Service Limit: 15%
If leakage exceeds service limit, inspect the engine for
the cause.
MAINTENANCE
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