SELVA MARINE Blue Whale 250 EFI, Service Manual

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6P23H11
5-28
1
2
3
4
5
6
7
8
9
3. Measure the camshaft runout. Replace if
above specification.
4. Measure the camshaft journal diameter
c
and cylinder head journal inside diam-
eter
d
. Replace the camshaft or cylinder
head assembly, or both if out of specifi-
cations.
Installing the camshaft, driven
sprocket, and timing belt
CAUTION:
• Do not turn the crankshaft counterclock-
wise, otherwise the water pump impeller
may be damaged.
• Do not turn the crankshaft or the driven
sprockets when the timing belt is not
installed. Otherwise the pistons and
valves or intake and exhaust valves will
collide with each other and be damaged.
• Do not turn the crankshaft and cam-
shafts unless instructions have been
given.
1. Check that the “ ” mark
a
on the drive
sprocket is aligned with the mating sur-
face of the crankcase and cylinder block.
Cam lobe
a
:
Intake:
46.30 – 46.40 mm
(1.823 – 1.827 in)
Exhaust:
45.35 – 45.45 mm
(1.785 – 1.789 in)
Cam lobe
b
:
Intake and exhaust:
35.95 – 36.05 mm
(1.415 – 1.419 in)
Camshaft runout limit:
0.015 mm (0.0006 in)
S6P25560
Camshaft journal diameter
c
:
24.96 – 24.98 mm
(0.9826 – 0.9834 in)
Camshaft cap inside diameter
d
:
25.000 – 25.021 mm
(0.9843 – 0.9851 in)
S69J5970C
d
c
S6P25480
PORT STBD
a
S6P25570
Power unit