Pump And Non-Return Valve; Overdrive Assembly; Overdrive Unit; Overdrive Adaptor - MG MGB Workshop Manual

THE OVERDRIVE (TYPE
L.H.)
5.
6.
Inspe
7.
Press the solenoid coil and base cap from the housing.
Remove
the
operating valve plunger
and ball
by
shaking from the solenoid rod.
ction
Examine the valve ball and seat for pitting and scoring
and renew damaged parts; the ball may be reseated by
light tapping onto the seat using a suitable drift.
Inspect the 'O' ring seals for signs of deterioration,
and renew as necessary.
Reassembling
9.
Reverse the dismantling procedure 4 to 6.
Refitting
10.
Reverse the removing procedure in 2 and 3, ensuring
that the lead grommet is pressed fully into its slot, and
using a new gasket under the solenoid cover.
Section Fc.8
PUMP AND NON-RETURN
VALVE
Removing
1. Drain the gearbox and overdrive unit.
2.
Remove the sump filter—Section Fc.5, 2 and 3.
3.
Using tool 18G 1118, unscrew the pump
retaining
plug.
4. Remove the non-return valve spring and ball.
5. Remove the pump body, the pump plunger spring and
plunger.
Dismantling
6. Using a suitable
drift,
separate the non-return valve
seat from the pump body taking care not to damage
the bore of the pump body.
Inspection
7. Examine
the '0' ring seals for signs of deterioration,
and renew where necessary.
8.
Examine the non-return valve ball and seat for scoring
and pitting, and renew damaged parts; the ball may be
reseated by lightly
tapping
onto
its seat using a
suitable drift.
Reassembling
9.
Carefully re■t the non-return valve seat to the pump
body.
Refitting
10.
Insert the pump plunger into the casing, ensuring that
the ■at side of the plunger is towards the rear of the
overdrive
unit
and retain in position with too] 18G
1117.
1 1.
Reverse the removing procedure in 2 to 5.
MGB.
Issue 1.
15676
Fig. Fc.8
Using tool 18G 1117 to retain the pump components
Section Fc.9
OVERDRIVE
ASSEMBLY
Removing
OVERDRIVE
UNIT
1.
Remove the engine and gearbox
from the car as
described in Section A.
2. Remove the gearbox drain plug and drain the oil from
the gearbox and overdrive.
3. Unscrew the six bolts
securing the remote control
assembly
to
the gearbox and remove the remote
control.
4. Remove the eight nuts from the studs securing the
overdrive unit to the gearbox adaptor.
5. Withdraw the overdrive
unit
from the
gearbox
adaptor.
OVERDRIVE
ADAPTOR
6. Remove the overdrive unit as in 1 to 5.
7. Slide the overdrive
pump
driving cam from the
gearbox shaft and remove the cam locking ball from
its pocket in the shaft.
8.
Using tool 18C 1004, remove the pump
cam circlip
from the shaft.
9. Withdraw the selector
interlocking arm and plate
assembly.
10.
Unscrew
the eight nuts securing the adaptor to the
gearbox and withdraw
the adaptor.
Dismantling
11.
Remove the solenoid cover and gasket.
12.
Withdraw
the solenoid and plunger.
13.
Remove the relief valve assembly.
14.
Remove the sump and ■lter.
15. Using tool 180 1118, unscrew the pump retaining
plug and remove the pump components.
16. Remove the speedometer drive retaining
clip, drive
gear, and sealing washer.
Fc.9