Checking The Valve Clearance - SELVA MARINE Blue Whale 250 EFI Service Manual

Checking the valve clearance

CAUTION:
Do not turn the flywheel magnet counter-
clockwise, otherwise the water pump
impeller may be damaged.
NOTE:
• Check the valve clearances when the
engine is cold.
• When adjusting the valve clearances, the
fuel pressure must be reduced before
removing any parts. To reduce the fuel
pressure, see Chapter 4, "Reducing the
fuel pressure."
1. Remove the flywheel magnet cover and
ECM cover.
2. Remove the blowby hose 1.
3. Disconnect the ignition coil couplers 2,
cam position sensor couplers 3, and
knock sensor coupler 4.
4. Disconnect the cooling water pressure
sensor adapter hose 5.
5. Remove all ignition coils and spark plugs.
6. Remove the ECM bracket bolts 6.
3
6
2
4
6P23H11
1
6
2
3
5
S6P25090E
7. Remove the cylinder head covers.
NOTE:
See the exploded diagram (5-8).
8. Turn the flywheel magnet clockwise and
align the "1TDC" mark a on the flywheel
magnet with the pointer b.
9. Check that the "II" marks c on the port
driven sprockets are aligned, and check
that the "I" marks d on the starboard
driven sprockets are aligned.
d
Power unit
1
2
3
4
c
5
a
6
b
S6P25100
7
8
9
5-10