Westerbeke W-46 - Inspection and Repair Procedures; Cylinder Head Inspection

INSPECTION/REPAIR
CYLINDER HEAD
1. Inspection
Check the gasketed sur face of
the cylinder head for flatness
by using a straightedge and
thickness gauge as in the case
of checking the crankcase sur-
faces. :Refer to Crankcase.
check is to be
precombustion
removed.
This
made with the
chamber jets
use a surface grinder to reface
the cylinder head, as
necessary, to the specified
flatness.
Specifications
Unit: mm (in.)
Item
Warpage of gasketed
surface
of cylinder
head
2. Precombustion
Replacement
Standard
Repair limit·
0.05,max 0.2
(0.0020)
(0.008)
Chamber
Jet
Do not remove the precombustion
chamber jets unless their
replacement is necessary. To
remove the jet (if cracks are
noted in it, or if head must be
machined to specifications)
ease it out by driving with a
flat-faced drift pin inserted
through the glow plug hole, as
shown.
Before installing the jet, wash
the precombustion chamber
cavity clean, and drive the jet
into position, with its orifice
pointing to the center of the
cylinder. Calk one portion
with a punch.
A-Intake port
B-Exhaust port
C-Jet
D-Caulking position
I
I
D
E
Checking cylinder head gasketed surface
for flatness
Removing precombustion chamber jet
A
B
Etjgifles & Generators
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