My left-hand drive Mark V presently has a throttle that does not quite return to low idle without a “blip” of the throttle pedal after going into neutral.
Spare Parts Catalogue Plate M and parts listed on page 21:
3264 Spindle, Throttle, Rear Carburetter M.7
199/4 Stop on Throttle Spindles M.8
4057 Stop, Sleeve, for Loose Lever M.9
4059/2 Lever, Loose, on Rear Spindle M.10
1380 Collar, Split, retaining Loose Lever M.11
3120/1 Lever, Fixed, on Rear Spindle M.12
681 Coupling, Flexible (complete with Clamps, Bolts and Nuts) M.13
Spare Parts Catalogue Plate BZ and parts listed on page 52:
C.3474 CONNECTING SPINDLE BZ.17
1942 Lever, on Spindle, adjacent to Socket BZ.18
C.3597 Coupling, Flexible from Connecting Spindle to Rear Carburetter Spindle BZ.27
307 Anchor for Carburetter Control Spring BZ.28
310 Spring, Carburetter Control BZ.29
The Service Manual repeats the parts plate at page C.3 Plate C.1.
The Service Manual on page C.10 Plate C.6 shows photograph of parts of the linkage.
The photo below shows my present linkage aft of rear carb. Order of parts on my car from rear carb to firewall appears to be (corrections welcome):
M.8 stop on spindle/M.7spindle end/BZ.27 Coupling, Flexible/BZ.17 Connecting Spindle/M.12? Lever/BZ.29 Spring/BZ.28 Anchor/BZ.18 Lever
Question 1: I don’t see M.9, M.10, M.11, or M.12 on my car. Where are these found, or are they only found on right-hand drive cars and should be absent on my left-hand drive car?
Question 2: My C.3257 Coupling, Flexible has the coupling spring wound in the direction that tightens the winding when the accelerator is depressed. When the accelerator is released from the foot, the car right now is not quite returning to low idle, but instead needs a throttle blip to seat correctly. In the garage, a finger motion of the accelerator linkage and then gentle return arrives where the 199/4 Stop on Throttle Spindles M.8 have about 0.006” free clearance unless the throttle is blipped. Should the flexible linkage be reversed so that it instead tightens when the accelerator is released?
Question 3: Do you see any other ways the linkage should be altered? I have put the 310 Spring, Carburetter Control BZ.29 towards the rear to give easier access to the distributor rotation and straight down spring motion rather than pulling slightly forward.