Cylinder Head Removal; Cylinder Head Inspection; Cylinder Head Warp Inspection - Polaris ACE 900 2017 Service Manual

ENGINE / COOLING SYSTEM

CYLINDER HEAD REMOVAL

NOTICE
The cylinder head can be serviced with the engine
installed in the chassis.
1. Disconnect coolant hose from thermostat housing if
connected.
2. Remove the two outer M6 bolts
w
cylinder head to the cylinder.
3. Loosen the six cylinder head bolts
at a time until all are loose.
4. Remove and discard the cylinder head bolts.
5. Tap cylinder head lightly with a soft faced hammer
until loose.
NOTICE
Tap only in reinforced areas or on thick parts of the
cylinder head casting.
6. Remove the cylinder head and head gasket
NOTICE
Once the cylinder head is removed, nothing retains the
cylinder to the engine. DO NOT rotate the engine
without using the Cylinder Holding & Camshaft Timing
Plate (PU-50563). Refer to Cylinder / Piston Removal
page 3.62.

CYLINDER HEAD INSPECTION

Thoroughly clean cylinder head surface to remove all
traces of gasket material and carbon.
CAUTION
Use care not to damage gasket sealing surface. All
gasket surfaces must be clean, dry and free of any oil
or grease upon assembly. Clean sealing surfaces with
rubbing alcohol or electrical contact cleaner. Do not
touch sealing surfaces of the new head gasket.
3.44

CYLINDER HEAD WARP INSPECTION

1. Lay a straight edge across the surface of the cylinder
q
that retain the
e
evenly 1/8 turn
r
.
q
head at several different points and measure warp
by inserting a feeler gauge between the straight
edge and the cylinder head surface. If warp exceeds
the service limit, replace the cylinder head.
MEASUREMENT
Cylinder Head Warp Limit:
.0039" (0.10 mm)
9929422 R02 - 2017-2019 ACE 900 Service Manual
© Copyright Polaris Industries Inc.