Westerbeke 20B TWO Tehnical Manual page 31

Valve Seat Repair
If a valve seat is found defective, reface it or
replace the cylinder head.
Sinkage of valve
Standard
Service limit
0.5
mm
1.5
mm
CAUTION
When checking valve sinkage, the valve guide
must
be
in normal condition. Resurface the
valve seat so that it contacts the mid-portion of
the valve face.
Valve Seat Installation
Installation of the cylinder head is in the reverse
order of removal. Pay attention to the following.
1. Renew the cylinder head gasket. No application
of sealant is necessary. On the upper front of the
gasket is engine model to which that gasket is
applicable. Be careful not to confuse it with a
gasket for another engine model.
2. Tighten the cylinder head bolts in the numerical
order shown in the figure at right, going through
that order two or three times. Tighten each bolt a
little at a time until all are tightened to the specified
torque.
3. When connecting the injector line assembly,
loosen the pipe clamp. When tightening the nut
at each end of the pipe, grip the nozzle holder or
delivery valve holder with a wrench to prevent it
from being turned together with the nut. Also, take
care not to allow dust to enter the fuel line.
29
Checking Valve Sinkage
Valve sinkage
Interface
and wear
Resurfacing Valve Seat (Common to intake and exhaust valves)
Sequence for Tightening Cylinder Head Bolts
Sequence for Tightening Cylinder Head Bolts
Westerbeke Engines