Engine; Valve Rocker Shaft And Tappets; Cylinder Head - Westerbeke WPDS-20 Technical Manual

Al2
ENGINE
Removing
1. Drain fresh water system. refer to "Cooling System".
2. Pump lubrication oil from sump.
3. Disconnect battery cables from engine.
4. Disconnect electrical leads from terminals board.
5. Disconnect fuel pipe clips and fuel pipe from lift pump.
6. Disconnect exhaust pipe from exhaust manifolds.
7. Disconnect stop control from injection pump lever.
8. Disconnect throttle control from injection pump lever.
9. Disconnect propeller shaft coupling from transmission coupling and move shaft
back approximately four inches.
1 O. Remove engine.
VALVE ROCKER SHAFT AND TAPPETS
Removing
1. Remove rocker cover
2. Release the rocker brackets from the cylinder head and lift off the rocker shaft
assembly
3. Remove air intake manifold
4. Remove the cylinder side cover with oil separator
5. Withdraw the push-rods
6. Lift out the tappets.
Refitting
Reverse the procedure in 1 through 6 noting:
1. Check cylinder head nut. Torque 75 (refer to Section F ;. Par. 17b). "Cylinder
Head".
2. Torque rocker bracket nuts (25 lb. ft.).
3. Adjust the valve rocker clearance (refer to Page A30 "Valve Rocker Clearance").
CYLINDER HEAD
Removing
1.
Drain cooling system (refer to Section D).
2. Disconnect exhaust pipe from manifold.
3. Disconnect stop control from injection pump lever.
4. Disconnect throttle control from injection pump lever.
5. Disconnect electrical lead from temperature sender.
6. Disconnect hose from thermostat housing.
7. Disconnect hose from expansion tank to heat exchanger.
8. Remove fuel pipes from fuel filter.
9. Remove high pressure pipes from injection pump and injectors.
1 O. Remove fuel return lines from each injector.
11. Disconnect electrical leads from the heater plugs.
12. Remove rocker cover.
13. Remove rocker shaft assembly and withdraw the push rods.
14. Remove combination exhaust manifold/ expansion tank. and air intake manifold.
15. Remove the cylinder head nuts. using tool 18 G 545 to remove the two which also
serve as rocker cover studs.
16. Lift off the cylinder head and push-rod positioning plate.