ODES UTV Desertcross 1000cc-3 - Page 74

3. ENGINE
3-
44
REQIRED TOOL
TDCDIAL
INFICATOR
(P/N 414 104 700)
1. Dial gauge
NOTE: If a dial gauge is not available , use a
screw driver or another similarly suitable tool.
NOTICE Do not scratch or damage piston/
cylinder surface.
NOTE: At ignition TDC the marks on the camshaft
timing gear have to be parallel to cylinder head
base as per following illustration.
1. Marks on camshaft timing gear
2. Cylinder 1leaol base
Leak Test
REQIRED TOOL
ENGINE LEAK
DOWN TEST KIT
(P/N 529 035 661)
Connect leak tester to adequate air supply
Set needle of measuring gauge to zero.
NOTE: All testers have specific instructions on
gauge operation and required pressure.
Install gauge adapter into previously cleaned spark
plug hole.
Supply combustion chamber with air pressure.
TYPICAL
1. Leak tester
2. Air supply hose
Note the amount or percentage of leakage
(depending on tester).
LEAKAGE
PERCENTAGE
ENGINE
CONDIT1ON
0% to15%
Excellent condition
16% to25%
Good condition
26% to40%
Fair condition; reduced
engine performance
41% and higher
Poor condition , diagnose
and repair engine
NOTE: To make sure there is no false reading due
to a valves not perfectly seated, tap each valve
adjustment screw (on the rocker) using a soft
hammer.
Diagnosis
Listen for air leaks .
_ Air escaping in intake port/throttle body means
leaking intake valve(s).
_ Air escaping in exhaust port means leaking
exhaust valve(s).
_ Air bubbles in the coolant (radiator) means
leaking cylinder head gasket.
_ Air/coolant escaping from cylinder/head means
damaged gasket(s) and/or loosened screws.