SECTION GGG

OVERDRIVE

Mk. I and II (SERIES BN7 AND BT7) AND Mk. II (SERIES BJ7)

Section No. GGG.1
Overdrive unit for BN7 and BT7 cars

Section GGG.1

OVERDRIVE UNIT FOR BN7 AND BT7 CARS

The overdrive units fitted to the BN7 and BT7 cars are basically similar to that described in Section 6. The following changes have, however, been made:

  1. A re-designed filter has been.fitted and is retained in the body by a boss on the inside of the drain plug. The filter is accessible through the drain plug hole.
  2. New operating pistons have been fitted with synthetic rubber sealing rings and the accumulator piston with three piece cast iron rings.
  3. The pinions are fitted with needle roller bearings in lieu of Clevite bushes.
  4. The outer ring of the uni-directional clutch is not riveted.
  5. An additional selective washer 0.160 +/- 0.005 in. thick is available.
  6. A re-designed solenoid bracket and adapter plate has been fitted.

Fig GGG.1 Overdrive front casing
Fig GGG.1 Overdrive front casing

Fig GGG.1 Key to the overdrive front casing
Fig GGG.1 Key to the overdrive front casing

Joint-overdrive unit. Stud—o~~erdrivuenit. Washerfor stud (spring) Nut for stud. No. 28. 29. 30. 31. 32. 33. Description Joint-bracket to case. Nut-bracket to casing. Washerfor nut (spring). Screw-bracket to casing. Washerfor screw. Washerfor screw (spring). Solenoid. Screw-solenoid to bracket. Washerfor screw (spring). Plate-solenoid bracket cover. Seal, oil-valve operating shaft. Distance collar. Lever-solenoid. Screw-lever to spindle. Washerfor screw (spring). Nut for screw. Piston assembly-accurnulatov. Aiizg-pis ton. Eousing assenzhly-accumulator. No. Description Spring for plunger. Plugfor valve-screwed. Washerfor plug. Cam-oil pump. Plunger assenzbly-oil Spring for plunger. Body-oil pump. Plug for body-screwed. Screw-body tofront casing. WasherJCorscrew (spring). Ball valve. Plzmger, ball. Spring for plunger. Washerfor valve plug (copper). Plug-valve. Strainer-oil puinp. Distance tubefor strainer. Bolt for strainer. Washerfor bolt. Washerfor bolt (spring). Plug-oil drain. Washerfor plug. Washer, steel. 1;YasIzer-phosphor bronze. Studfor solenoidbracket. Jointfor coverplate. Ring-piston. Plate-adaptor. Stud-adaptor Joint-adaptor Nut-plate stud to casing. Casing-front . Plug. Shaft-valve operating. Lever for shaft. Pin-lever to shaft. pump. Washerfor stud (spring) to casing. to casing. Cam-valve Pin for cam. Sealfor shaft. Stud for solenoid bracket. Stud for plate-long. Stud for plate-short. Stud-front to rear casing. Peg-oil pzlmp plunger guide. Nut-front casing to adaptor plate. WasJzerfor nut (spring). Breather. Bracketsolenoid. Stop (rubber). operating. Ring, rubber. Spring–accumulator Tubefor spring. Piston-assembly-operating. Ring, piston. Valve,operating. Ballfor valve. Hunger, ball. pressure.