Sea-doo GTX Limited iS 255 2009, Shop Manual

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Section 02 ENGINE
Subsection 10 (CYLINDER HEAD)
A
R610motr126A
A. Valve stem diameter
VALVE STEM DIAMETER
NEW
Exhaust
5.946 mm - 5.960 mm
(.2341 in - .2346 in)
Intake
5.961 mm - 5.975 mm
(.2347 in - .2352 in)
SERVICE LIMIT
Exhaust
Intake
5.93 mm (.233 in)
Replace valve guide if it is out of specification or
has other damages such as wear or friction sur-
face. Refer to valve guide replacement below.
VALVE GUIDE INNER DIAMETER
NEW
Exhaust
Intake
5.994 mm - 6.018 mm
(.236 in - .2369 in)
SERVICE LIMIT
Exhaust
Intake
6.060 mm (.2386 in)
Valve Face and Seat
1
2
R1503motr107A
3
1. Valve seat
2. Exhaust valve contaminated area
3. Valve face (contact surface to valve seat)
Check valve face and seat for burning or pittings
and replace valve or cylinder head if there are
signs of damage.
Ensure to seat valves properly. Apply some lap-
ping compound on valve face and work valve on
its seat with a lapping tool.
Measure valve face contact width.
NOTE: The location of contact area should be in
center of valve seat.
Measure valve seat width, using a caliper.
VALVE SEAT CONTACT WIDTH
NEW
Exhaust
1.25 mm - 1.55 mm
(.049 in - .061 in)
Intake
1.10 mm - 1.30 mm
(.043 in - .051 in)
SERVICE LIMIT
Exhaust 2 mm (.079 in)
Intake 1.8 mm (.071 in)
If valve seat contact width is too wide or has dark
spots, replace the cylinder head.
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smr2009-025