BOMBARDIER DS 650, Руководство по ремонту

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Section 03 ENGINE
Subsection 08 (CYLINDER AND HEAD)
VMR2004_012_03-08A.FM
03-08-3
GENERAL
NOTE: When diagnosing an engine problem, al-
ways perform the cylinder leak test. This will help
pin-point a problem. Refer to the instructions in-
cluded with your leak tester and LEAK TEST sec-
tion for procedures.
Always place the vehicle on a level surface.
NOTE: For a better understanding, the following
illustrations are taken with engine out of vehicle.
To perform the following instructions, it is not nec-
essary to remove engine from vehicle.
Always disconnect the negative wire from the bat-
tery before working the engine.
Even if the removal of many parts is not necessary
to reach another part, it is recommended to re-
move these parts in order to check them.
During assembly/installation, use the torque val-
ues and service products as in the exploded views.
Clean threads before applying a threadlocker. Re-
fer to SELF-LOCKING FASTENERS and LOCTITE AP-
PLICATION at the beginning of this manual for com-
plete procedure.
When disassembling parts that are duplicated in
the engine, (eg: valves, springs, etc.), it is strongly
recommended to note their position (PTO, MAG
side) and to keep the parts of the same assembly
as a “group”. If you find a defective component,
it will be much easier to find the cause of the fail-
ure among its group of parts (eg: you found a worn
valve guide. A bent spring could be the cause; it
will be easy to know which one of the springs is
the cause and to replace it if you grouped the parts
of the same assembly at disassembly). Besides,
since used parts have matched together during
the engine operation, they will keep their matched
fit when you reassemble them together within
their “group”.
CYLINDER HEAD COVER
Removal
Remove fuel tank. Refer to FUEL CIRCUIT sec-
tion.
Remove the breather hose on the top of cylinder
head cover
no. 1 .
Unscrew all bolts no. 2 retaining the cover.
Remove the cover with the gasket no. 3 .
Inspection
Check the cylinder head cover for cracks or other
damages.
Check if the gasket is brittle, hard or otherwise
damaged.
Replace all defective parts.
Installation
Reinstall the cover. To do this, reverse the removal
procedure.
Take care that the gasket is located properly into
the groove in the cover.

WARNING
Always disconnect BLACK (-) cable first and
reconnect last.

WARNING
Torque wrench tightening specifications must
strictly be adhered to.
Locking devices (ex.: locking tabs, elastic stop
nuts, self-locking fasteners, cotter pin, etc.)
must be installed or replaced with new ones
where specified. If the efficiency of a locking
device is impaired, it must be renewed.