Removing The Cylinder Head; Checking The Valve Spring; Checking The Valve - SELVA MARINE Blue Whale 250 EFI Service Manual

POWR

Removing the cylinder head

1. Remove the cylinder head bolts in the
sequence shown.
PORT
(T55)
CAUTION:
Do not scratch or damage the mating sur-
faces of the cylinder head and cylinder
block.
2. Remove the intake and exhaust valves.
NOTE:
Be sure to keep the valves, springs, and
other parts in the order as they were
removed.
5-43
Power unit
UP STBD
S6P25810E
Valve spring compressor 1:
90890-04019
Valve spring compressor
attachment 2:
90890-06320

Checking the valve spring

1. Measure the valve spring free length a.
Replace if below specification.
Valve spring free length a:
44.2 mm (1.74 in)
2. Measure the valve spring tilt b. Replace
if above specification.
Valve spring tilt limit b:
1.2 mm (0.05 in)

Checking the valve

1. Check the valve face. Replace if pitted or
worn.
2. Measure the valve margin thickness a.
Replace if out of specification.
6P23H11