Danni’s Transmission Blog

The Front Drum Unit

Tue, 28 Mar 2006 08:18:31 -0500

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The Drum Assembly

Sun, 26 Mar 2006 14:13:37 -0500

At this point, all that is left in the gearbox casing is the drum assembly. Above it is seen in situ, with only the center bearing cap removed (lying at right on the rear drum).

Below is shown the assembly removed. Intermediate shaft (blue), planetary gears (green) and clutch hub of the front drum, front drum assembly (red) with the front drum band around it, the oil delivery sleeve (purple) that provides oil under pressure to both band units and the rear drum assembly (yellow) with the larger rear drum band. The front band is tightened to stop drum rotation by the front servo unit, and the rear band similarly by the rear servo.

The Reverse Assembly

Sun, 26 Mar 2006 07:26:52 -0500

The reverse assembly is comprised of the reverse epicyclic unit, the rear extension casing and the output shaft.

Brake Servo Drive and Speedometer Drive

Sat, 25 Mar 2006 07:38:04 -0500

The brake servo provides additional mechanical stopping power to the brakes through conversion of energy from the drive shaft to the brake levers by way of friction plate within the servo unit. Thus it operates only when the car is moving and the drive shaft is rotating. Application of the brakes while the car is stationary does not receive this additional servo assist.

The Front Pump

Tue, 21 Mar 2006 19:54:49 -0500

The front pump (yellow) is mounted at the front of the gearbox casing, and is concentric with the mainshaft. The pump rotor rotates with the front drive shaft.

The front band (red) and the rear band (green) are shown in place on their respective band units.

Removal of the pump is difficult as the tight fit into the casing functions as an oil seal. The shop manual suggests a gentle tap to the rear of the pump, but access is almost impossible. A better technique is to place a lever between the pump and the front band unit, and while applying careful leverage, firmly hit the casing to induce vibrational force - the pump will then free itself (thanks Ralph Curzon).

The pump is removed together with the intermediate drive shaft (main picture above).