Oil Pump; Flywheel - MG MGA Twin Cam Workshop Manual

Secure the drive gear housing with the two nuts, spring washers, and flat washers. Refit the
distributor, referring to Section B.7 for retiming instructions if the distributor clamp plate has been
released.
A.31 OIL PUMP
Remove the sump and oil pump strainer (see Section A.25).
Two bolts secure the oil pump cover and three studs secure the pump to the crankcase.
Unscrew the stud puts and remove the pump and drive shaft.
When refitting the pump use a new joint washer.
Fig. A.13 Replacing the distributor drive gear. The slot is horizontal with the large offset uppermost
Dismantling and reassembling
The oil pump cover is attached to the body of the pump by two bolts and spring washers, and when
these are removed the oil pump cover, the outer rotor, and the combined oil pump shaft and inner
rotor may be extracted.
NOTE. If a new or reconditioned oil pump is being fitted it is necessary to remove the half-speed shaft
(see Section A.29) to enable a check of the pump gear end-float and "free spin' to be made. After
removing the half-speed shaft mount the pump with drive gear and thrust washer in position and
tighten down to the correct torque figure (275 lb. in.). Check that the shaft rotates freely and that the
end-float is not excessive. The oil pump must be assembled in the dry condition, but lubrication
should be used on the oil pump driving gear spindle in the cylinder block, Refit the half-speed shaft,
etc., as detailed in Section A.29.
A.32 FLYWHEEL
Remove the power unit (see Section A.24). Remove the gearbox from the gearbox mounting plate.
Mark the clutch and flywheel to allow the two components to be reassembled in their original
positions. Remove the six set screws securing the clutch to the flywheel and remove the clutch.
Mark the flywheel and crankshaft flange. Unlock and remove the six nuts and three lock plates which
secure the flywheel to the crankshaft mounting flange and remove the flywheel.
Replacement of the flywheel is a reversal of the above instructions. Take care to fit the flywheel and
clutch in their original locations by lining up the marks made when dismantling, otherwise engine
vibration will result.
To release the special flywheel bolts the engine sump and rear main bearing cap must be removed.
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