Westerbeke W-46 - Page 29

INSPECTION/REPAIR
Crankcase
1. Inspect the outside and inside
sur faces for ·evidence of
cracking. Visually examine the
cylinder bores for scuffing,
rusting, erosion or any
abnormal wear. Using a
straightedge, check the top
face (for mating with cylinder
head) , front face (for mating
with front plate) and rear face
(for mating with rear plate)
for flatness.
2. Make sure that the top face of
the crankcase is flat within
the standard specified below.
If the standard is exceeded,
reface the top by using a sur-
face grinder to make it flat
within the specified standard.
Specifications
Unit: mm (in.)
Item
Standard
Repair
limit
Warpage of crankcase
0.05, max.
0.2mm
gasketed surface
(0.0020)
(0.008)
Crankshaft
1. Journals
a. Inspect each journal for
surface flaws such as
roughing, scratches, pitting
and burns, and, as neces-
sary, repair the journals by
grinding to the next under-
size or replace the
crankshaft.
b. Measure each journal with a
micrometer (take a total of
four readings) to determine
the wear, out-of-round and
taper (cylindricality). If
any of the limits are
exceeded, repair by grinding
to the next undersize or
replace the crankshaft.
27
- STRAIGHT EDGE
Checking crankcase top for flatness
A-
8-
Checking crankcase top for flatness
Positions for measuring journal
with a micrometer