Dismantling The Gearbox; Gearbox Outler Cover; Gearbox Inner Cover; Gear Cluster - Triumph SPEED TWIN 1945 Workshop Instruction Manual

Drsrnontling Gearbox
R e a r Engine P l a t e Studs. Slacken t h e nuts o n the f r o n t l o w e r studs and remove
all other nuts f r o m the right hand engine plate. (The gearbox adjuster can be left
i n position). Remove the studs by drifting w i t h an aluminium rod.
Remove t h e
cover plate, slacken the pivot bolt and ease the gearbox back, when both plates can
be removed.
P i v o t B o l t . Remove the nut and withdraw t h e pivot bolt. The gearbox can n o w
be taken o u t o f the frame.
D I S M A N T L I N G
T H E
G E A R B O X
Before attempting t o dismantle the gearbox, wash i t thoroughly t o remove dirt, o i l
and grease, etc. Drain the oil by removing the plug i n the rear of the casing. (Note-
on the Models equipped with the swinging arm rear suspension, the drain plug
i s
placed at t h e bottom front of the casing). Place the gearbox i n the vice, w i t h t h e
pivot lug gripped between the jaws.
G e a r b o x O u t e r Cover.
Unscrew the five screws and three nuts holding t h e
outer cover t o the inner cover and tap the ioint gently w i t h a hide hammer, t o
break the jointing compound seal. G r i p the gearchange lever and kickstarter crank
and withdraw the cover from the gearbox.
G e a r b o x I n n e r Cover. Bend back the tab o n the kickstarter ratchet and pinion
lockwasher and, placing a block between the gearbox sprocket and the vice t o prevent
the sprocket revolving, undo the securing nut. W i t h d r a w t h e ratchet and pinion
assembly complete. Remove the four screws securing the inner cover t o the shell.
Tap t o break the joint seal and remove the cover. Care should be taken t o prevent
the contents of the gearbox from coming away w i t h the inner cover.
G e a r Cluster.
Remove the gear selector fork rod. Slide t h e mainshaft from t h e
case until the clutch end comes free from the high gear. Taking care n o t t o lose the
rollers from the selector forks, remove the gear clusters f r o m the gearbox i n one
assembly. The only gear remaining i s the high gear which i s held i n position by t h e
sprocket n u t (See page 78).
The gearbox
i s
now completely broken down into units and it i s proposed t o deal
w i t h these units separately i n such a way that the fitter can dismantle, averhaul and
re-assemble the major unit assemblies.
By doing t h e w o r k i n this manner t h e assembly of the gearbox i s simplified i n that
there i s no sub-assembly t o bother about while concentrating o n the correct assembly
of the complete unit.