Inspection - Westerbeke 8.0KW-60Hz Service Manual

INSPECTION
CYLINDER HEAD AND VALVE MECHANISM
CHECK
/THREADS
CHECK OIL HOLES FOR CLOGGING
~
I
INSPECT END
FOR WEAR
~~
' " CHECK FOR WEAR
IN BORE
CHECK VALVE SEATS
FOR PROPER CONTACT
AND WEAR,
CHECK VALVE GUIDES
WEAR
INSPECT FOR
WEAR ANO
CONTACT
INSPECT AND
TEST SPRING
INSPECT FOR CRACKS, OIL
OR COOLANT LEAKS. CLEAN
OFF SCALE AND CARBON
DEPOSITS
CHECK FOR GALLING
AND WEAR
4-_ _
-INSPECT FOR RIDGES
OR DAMAGE
j+---INSPECT FOR BEND
CHECKENDS~
FOR WEAR
AND OAMAGE
"~
1. Cylinder head. Using a heavy accurate straight edge and
a feeler gauge, check the bottom face for warpage in three
positions, lengthwise, two crosswise and two widthwise as
shown in the illustration. If warpage exceeds the limit,
reface the bottom face with a surface grinder.
WARPAGE - CYLINDER HEAD BOTTOM FACE
STANOARD 0.0020 in (0.05mm) MAXIMUM
LIMIT 0.0039in ((0.10mm)
INSPECTING THE
CYLINDER HEAD
BOTTOM FOR
WARPAGE
2. Rocker arms and rocker shaft. Measure the bore in the
rocker ann for the rocker shaft and the diameter of the
rocker shaft to find the clearance between the ann and the
shaft. If the clearance has reached the limit, replace the
rocker arm. If it exceeds the limit. replace both arm and
shaft.
BORE IN ROCKER ARM FOR SHAFT
STANDARD 0.74449 - 0.74527 in (18.910 -18.930mm)
DIAMETER OF SHAFT FOR ARM
STANDARD 0.74331 - 0.74401 in (18.880 -18.898mm)
CLEARANCE BETWEEN ROCKER ARM AND SHAFT
STANDARD 0.00047 - 0.00197 in (0.012 - 0.050mm)
LIMIT 0.00787 (0.200mm)
MEASURING ROCKER ARMS
AND ROCKER SHAFT
Engines & Generators
16