Oil Pump, Connecting Rods And Pistons - Westerbeke WPDS-20 Technical Manual

NOTE: The front plate must be removed to renew the chain vibration damper.
9. Remove the timing chain tensioner.
Al5
10. Disconnect the throttle and stop controls, and the throttle return spring, from
the injection pump.
11. Disconnect the fuel feed and return pipes from the injection pump.
12. Disconnect the high pressure pipes from the injection pump.
13. Remove the lubricating oil feed pipe from the crankcase and injection pump chain
wheel hub.
14. Remove the front plate complete with injection pUT.:'lp.
15. Remove the cylinder side cover.
16. Drain and remove the sump.
17. Release the oil delivery pipe from the crankcase.
18. Remove the dowel screw shown in Fig.
5
and withdraw the oil pump and strainer.
19. Remove the rocker cover.
20. Remove the rocker shaft.
21. Withdraw the push-rods.
22. Lift out the tappets.
23. Withdraw the camshaft.
24. Refitting. Reverse the procedure in 1 to 23 as necessary noting:
a. 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.
b. Check the camshaft end-float against the figure in Data.
c. Check the chain wheel alignment (see Data).
d. Assemble the chain and chain wheels to their shafts with the timing marks as
shown in Fig.
4 •
e. Release the chain tensioner slipper as shown in Fig. 2.
f. Ensure that the crankshaft front oil seal is serviceable. If necessary renew the
seal, using tools 18G 134 and 18G 134CR.
g. Centralize the timing cover with tool 18G 3.
h. Refer to Data for torque wrench settings.
i.
Adjust the valve rocker clearance (see Data).
J.
Bleed the fuel system.
OIL PUMP, CONNECTING RODS AND PISTONS
Removing
1. Remove engine.
2. Remove valve rocker shaft and tappets.
3. Remove cylinder head.
4. Remove the big-end caps.
5. Withdraw the connecting rods and pistons upward.
6. Refitting. Reverse the procedure in 1 to 5, noting:
a. The cylinder head gasket is marked to ensure correct fitting.
b. Refer to Data for torque wrench settings. .
c. Fit the connecting rods with their offsets as
show~l
in Fig.6 , using tool18G 55 A
to compress the piston rings.
d. Tighten the cylinder head nuts in the order shown in Fig.
1 •
e. Adjust the valve rocker clearance (see Data).
f. Bleed the fuel system.