BRP ski-doo MACH Z 1000 SDI, Handbook

Page: 133 / 493

SECTION 05 - ENGINE PREPARATION
MMC2005-001_05A.FM
05-9
AVAILABLE RAVE SPRINGS
Maintenance
There are no wear parts anywhere in the system
and there are no adjustments to be periodically
checked. The only possible maintenance required
would be cleaning of carbon deposits from the
guillotine slide. Cleaning intervals would depend
upon the user’s riding style and the quality of the
oil used. Using Ski-Doo oil, we would suggest an-
nual cleaning of the valve. If a customer uses a
lower quality, high ash oil, more frequent cleaning
may be required.
No special solvents or cleaners are required when
cleaning the valve.
Bench Test for Checking RAVE Valve
Operation
The operation of the valve can be checked by pres-
surizing the engine as one would when checking
for crankcase leaks.
The engine must be sealed at all exhaust flanges,
all carburetor inlets, and at the fuel pump impulse
fitting. Depending on the design of your pressure
test kit, you may be pressurizing the engine through
the crankcase or right at the exhaust flange cover
plate. If you are pressurizing through the crank-
case, make certain the piston uncovers the ex-
haust port on the side you are checking.
Install the RAVE valve movement indicator (P/N
861 725 800) in place of the red plastic adjuster on
the diaphragm cover so that you can observe the
diaphragm movement.
Spring P/N
Wire Dia.
Free
Length
Preload in N (LBF)
at
Compressed
Length of
14 mm (.551 in)
mm (in) mm (in)
420 239 948 1.0 (.039) 38.0 (1.50) 19.5 (4.37)
420 239 944 0.9 (.035) 48.5 (1.91) 15.9 (3.56)
420 239 942 0.8 (.031) 42.5 (1.67) 7.3 (1.64)
420 239 941 0.8 (.031) 52.5 (2.07) 10.5 (2.36)