Rolls-Royce 20/25 - gearbox

 

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Gearbox - rear

 

Rear view of the gearbox.  The selector rods case can be seen rear, bottom right adjacent to the output shaft.

 

Gearbox - nearside

 

 

Nearside view showing the brake servo - a close-up is lower down.  Note the brake release damper, middle right, which is attached to the top of the 'T' connector.  This over-engineered piece of kit was designed to stop the whole assembly clattering when the brake pedal is released.  It is important to keep this unit clean and lubricated (see the One-shot oil supply).

Gearbox - servo

 

 

Close-up view of the brake servo.

Gearbox - bell housing

 

 

Inside view of the bell housing.  Note the oil pipe, top left, that drops oil into the well on the top of the release bearing trunnion.  The two horizontal shafts beneath the release bearing are the clutch cross-shaft (upper) and brake shaft (lower).   The circular casting extension on the right of the picture is for the starter motor.

Gearbox - offside

 

 

The offside of the clutch cross shaft, where it exits the bell housing, has a Woodruff key for locating the pedal shaft.  The paper bung is to stop dirt ingress via the gear stick aperture.

Gearbox - gear stick

 

 

The gear stick extension arm and gate.

Gearbox - selector lever

 

 

The selector arm at the inner end of the gear stick cross-shaft.

Gearbox - overdrive

 

 

The Laycock 'J' type overdrive unit.  This provides an engine speed reduction of roughly 27% in 3rd and 4th gears.

 

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