Combustion Chamber Volume Measurement - Sea-doo RX Shop Manual

Section 04 ENGINE
Subsection 05 (TOP END)
Combustion Chamber Volume
Measurement
All Engines
NOTE: This procedure is required to determine
gasket thickness if you do not know the gasket
thickness that was installed, if a crank repair has
involved replacement of connecting rods or if you
are experiencing repetitive engine seizure.
The combustion chamber volume is the region in
the cylinder head above the piston at Top Dead
Center. It is measured with the cylinder head in-
stalled on the engine.
TYPICAL
1. Combustion chamber
NOTE: When checking the combustion chamber
volume, engine must be cold, piston must be free of
carbon deposit and cylinder head must be leveled.
947 Carburetor-Equipped Engines
1. Remove both spark plugs and bring one piston
to Top Dead Center a using a TDC gauge.
F01D2IA
1. Bring piston to TDC
04-05-20
947 DI Engines
1. Remove both direct injectors and bring one pis-
ton to Top Dead Center using a TDC gauge.
Keep spark plugs in their holes.
All 947 Engines
2. Obtain a graduated burette (capacity 0 - 50 cc)
and fill with an equal part (50/50) of gasoline and
injection oil.
1
F00B0BA
1. Graduated burette (0 - 50 cc)
3. Open burette valve to fill its tip. Add liquid in
burette until level reaches 0 cc.
4. Inject the burette content through the spark
plug hole on carburetor-equipped engines
and through direct injector hole on DI engines
until liquid touches the top hole.
1
TYPICAL
1. Top of hole
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