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Clutch Modifications for late TD & TF

Don Harmer

To overcome the binding and extreme wear of the clevis pivots in the clutch linkage due to the axis of rotation changing as
the clutch is depressed, the clevis type pivots for some ends were replaced by control rod ends (spherical bearings). this
was done to solve the five bar linkage problem where all bars are not in the same plane.

Replaced

Pedal Shaft

(22)

Clutch Rod

(37)

Circlip

(28)

Barrel Pin

(43)

Washers

(27)

Lever (Clutch)

(38)

Pedal Bushing

(26)

Clutch Link

(48)

he lever on the oil pan (38) was remade with a metric bearing to fit the pin on the oil pan (40) and to provide

attachments for two rod ends.As an alternate, the original oil pan lever (36) and the Clutch Link rod (48) (the upper rod in
sketch) could be used, instead of the one shown, as this rod always moves perpendicular to its end pivots and control rod
ends are not essential here (Still put in Oilite bushings for the clevis pins). Then modify the original oil pan lever (38) to
accept the control rod end from Clutch Rod (37) in the the bottom yoke. (The hole for the barrel pin needs filling in).

The lower rod to the clutch pedal , Clutch Rod (37) is where it is essential to have rod end bearings that can swivel as the

mechanism goes thru its travel as the clutch is depressed and the angle of the rod changes relative to the pivots on the
ends. The Pedal shaft is then unaltered, perhaps its lever is bent to give clearance between the rod end and the brake
pedal. In the above sketch, a new pedal shaft (22) was made with the rod end on the pedal shaft mating to a U (**) on the
Clutch rod(37). The simpler version puts Rod ends on each end of the Clutch Rod (37) only and bolt to pedal shaft clevis
pin hole or add a clevis style “U”.to the lever on the pedal shaft. At Rod ends use bolts not clevis pins.

Use 1/4 inch ID or 6 mm ID rod bearings with 1/4 x 28 or 6 x 1 mm threaded attachment threads, either male of female,

adjustment is provided by a turn buckle equivalent (Right and left hand threads) The upper rod adjustment is for length
only needed at installation. The lower rod turn buckle provides the clutch adjustment as does the current system nut (45).

The pedal shaft (22) on most T-Cars is usually so badly worn that replacing it and improving the greasing and bearings is

needed.