Westerbeke WPDS-20 Technical Manual page 40

Al7
20. Check the backplate for flatness. Examine the backplate two dowels locating
holes for the cylinder block dowels are free from burrs. Examine the two
locating dowels in the backplate for the alignment of the flywheel housing are
free from burrs.
21. Position the flywheel housing over the backplate locating dowels, checking align-
ment of locating holes and dowels. Ream and fit oversize dowels if required.
To Install
It
is most important that the backplate, flywheel and flywheel housing be correctly
aligned with the crankshaft.
22. Install oil seal
if
removed.
23. Install new gasket to cylinder block face.
24. With the two flywheel housing locating dowels installed in the backplate. Install
the backplate to the cylinder block gasket with cylinder block dowels in the back-
plate locating holes. Secure with bolts and lock washers.
Alignment of Backplate
25. Secure the dial test indicator gauge with the base of the gauge to the crankshaft.
Set the plunger of the gauge against the vertical face of the backplate. Turn
crankshaft and check that the face of backplate is at right angles to crankshaft
axis. This facing should be within inches (total indicator readmg) of being at
right angles to crankshaft axis.
All adjustments to bring the backplate within the limit must be on the backplate
and under NO CONDITIONS must the rear face of the cylinder block be inter-
fered with.
26. Fitting Flywheel. (Hydraulic Transmission)
a. Install flywheel on crankshaft flange and secure flywheel to crankshaft with
star washer and bolts.
b. Bend over tabs of star washer.
c. Fitting Damper Plate. (Hydraulic Transmission)
d. Secure damper plate to flywheel with sockhead screws.
27. Fitting Flywheel. (Manual Transmission)
a. Install the flywheel gear drive plate and star washer to crankshaft and secure
with bolts. Bend over tabs of star washers.
b. Secure base of the dial test indicator to the backplate adjust gauge so as to
set gauge plunger against vertical machined face of flywheel. Press crank-
shaft one way, to take up end float, and turn flywheel. The run out on the
flywheel face should be within
o.
002 in.
Install and Align Flywheel Housing
28. Locate the flywheel housing on the backplate two locating dowels and secure
housing to backplate (from front of housing and rear of backplate) with set bolts
and lock washers.
29. Attach indicator gauge base to flywheel, adjust the indicator gauge plunger
against the flat machined face of the flywheel housing. Turn crankshaft check-
ing that this face is perpendicular to crankshaft axis. The limit for this facing
is O. 006 in. (total indicator gauge reading) of being at right angles to the crank-
shaft axis.
30. With indicator gauge base still attached to flywheel, set plunger of gauge to
interior of bored hole in flywheel housing. The limit for this is 0.010 in. (total
indicator gauge reading).