BRP BOMBARDIER DS250 2006 Shop Manual page 50

Connect the tester to an air supply.
Set gauge needle to zero (0).
NOTE: Each tester will have specific instruction
on the gauge operation and required pressure.
Connect the tester to the adaptor hose.
Supply combustion chamber with air pressure.
Record the amount of leaking or percentage (de-
pending on tester).
LEAKAGE
PERCENTAGE
0% to 15%
16% to 25%
26% to 40%
41% and higher
Diagnosis
Listen for air leaks.
– air escaping from intake side means leaking in-
take valve(s)
– air escaping from exhaust side means leaking
exhaust valve(s)
– air bubbles out of radiator means leaking cylin-
der head gasket
– air/oil escaping from crankcase means dam-
aged gasket and/or loosened screws
– air/coolant escaping from cylinder/head means
damaged gasket(s) and/or loosened screws
– air escaping into crankcase area means exces-
sively worn cylinder and/or broken piston rings.
Reassembly
Reverse the preparation procedure. Ensure to
respect torque values and use of appropriate
products/lubricants. Refer to exploded views of
other sections as required.
vmr2006-067
ENGINE
CONDITION
Excellent condition
Good condition
Fair condition; engine
will run and in some
cases, performance
might be affected
Poor condition, diagnose
and repair engine
Section 03 ENGINE
Subsection 02 (ENGINE LEAK TEST)
31