Valve Sealing Test; Combustion Chamber Cleaning - Polaris RANGER ETX 2015 Owner's Manual

ENGINE / COOLING SYSTEM
7. Measure valve guide inside diameter at the top
middle and end of the guide using a small hole
gauge and a micrometer. Measure in two directions.
MEASUREMENT
Valve Guide I.D.:
.1968 – .197 in. / 5.00 - 5.015 mm
8. Be sure to measure each guide and valve
combination individually.
The valve guides cannot be replaced.

VALVE SEALING TEST

1. Clean and dry the combustion chamber area.
2. Pour a small amount of clean solvent into each
q
intake port and check for leakage around the
valves. The valve seats should hold fluid with no
seepage.
3. Repeat for exhaust valves by pouring fluid into each
w
exhaust port .
3.52
NOTE
9926806 R03 - 2015 - 2016 RANGER ETX / 570 2-SEAT 2015 - 2016 RANGER 570 CREW Service Manual

COMBUSTION CHAMBER CLEANING

CAUTION
Wear eye protection during combustion chamber
cleaning.
1. Clean all accumulated
combustion chambers and valve seat area
Carbon Clean Fuel Treatment (2871326) can be used
to help remove carbon deposits.
Do not use a metal scraper, a coarse wire brush or
abrasive cleaners to clean the cylinder head. Damage
may result.
2. Visually inspect cylinder head gasket surface and
combustion chamber for cracks or damage. Pay
close attention to the areas around spark plug and
valve seats.
carbon deposits
q
.
NOTE
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