Crankshaft - Westerbeke WPDS-20 Technical Manual

Al8
CRANKSHAFT
Removing
1. Remove engine.
2. Remove flywheel housing, flywheel and backplate.
3. Remove timing chain, chain wheels, and chain ter;.sioner.
4. Pump lubrication oil from sump.
5. Remove sump.
6. Release the oil delivery pipe from the crankcase.
7. Remove the dowel screw shown in Fig. 5, and withdraw the oil pump.
8. Remove the big-end caps and separate the connecting rods from the crankshaft.
9. Remove the main bearing caps, using tools 18G 284 and 18G 284AJ.
10. Lift out the crankshaft and
coll~ct
the main bearing and thrust washer halves.
Refitting
11. Reverse the procedure in 1 to 35 noting:
a. Refer to Data for torque wrench settings.
b. Check crankshaft end-float against the figure in Data.
c. Before tightening any of the front plate bolts, fit all bolts which pass through
the front plate into the cylinder block to ensure correct positioning of the
front plate.
d. Check the chain wheel alignment (see Data).
e. Assemble the chain and chain wheels to their shafts with the timing marks as
shown in Fig.
tI •
f.
Release the chain tensioner slipper as shown in Fig. 2.
g. Ensure that the crankshaft front oil seal is serviceable. If necessary renew
the seal, using tools 18 G 134 and 18 G 134 CR.
h. Centralize the timing cover, using tool 18G 3.
1.
Ensure that the crankshaft rear oil seal is serviceable.
If
necessary renew
the seal, using tools 18G 134 and 18G 134CQ.
k. Use tool 18G 554 to align the clutch plate.
1. Bleed the fuel system.