AD Boivin 2002 Snow Hawk, Service Manual

Page: 68 / 173

ENGINE / CYLINDERS AND CYLINDER HEADS 7 - 18
8. Turn on the pump increasing the pressure to 35.4 kPa
(5 PSI) . Do not exceed this pressure.
9. The engine must maintain this pressure for 3 minutes.
If the pressure falls before 3 minutes, check the testing
apparatus by spraying a soapy solution on the pump
piston, on all the plugs and on the connections.
o
If the testing apparatus has any leaks, air bubbles will
indicate where they are.
o
If the testing apparatus has no leaks, check the engine
in accordance with the directions in this sub-section.
Procedure to follow
When the section being checked shows a leak, it is
recommended that the following be tried before undertaking to
service the engine since there may possibly be more than one
leak in the.
When the section being checked does not show any leaks,
continue pumping to maintain the pressure and check the
following points until the leak is found.
When the exhaust manifold is installed, use a rubber hood. In
this case, it is not necessary to bring the piston to its lowest
point.
Verify the following:
1. All the junction points and the threads of the screws and
studs of the engine:
o
base of the spark plugs, insulation
o
cylinder head
o
cylinder base
o
half-housings (joint)
o
bleed screws and caps
2. Remove the primary clutch and check the exterior ring
seal of the crankshaft. (PTO)
3. Remove the recoil starter and the magneto, and then
check the ring seal of the crankshaft. (MAG)