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Series Land Rover Accelerator Linkage

It is often assumed that lack of petrol engine performance is always caused by problems within the ignition system, general engine wear, or binding brakes. Less often will suspicion fall upon the condition of the accelerator linkage, yet these linkages are vital to providing sufficient fuel to the engine.

1. This rod linkage is too long and can cause the linkage to jam temporarily. A wrong part has been fitted.
2. Often removed and not replaced, the accelerator pedal stop prevents undue stress on the linkage caused by excessive pedal travel.
3. This linkage assembly near the carburettor has press fit components and over time they can wear and slip, rather than transmit the full accelerator travel to the carburettor .

It is important that all the linkages have their full extent of travel available to them and are not hampered by obstructions such as lose wiring or worn bushes. The number of linkages along the journey from the accelerator pedal to the carburettor is quite substantial and a little wear in each one can result in the carburettor throttle flange not fully opening. Also, each of the ball joints along the system needs to be well greased and free to move unrestricted.
  To test the linkage system, simply hold down the accelerator by placing a weighty object on it and check inside the carburettor that the butterfly flange is in the vertical position.

The most dramatic effect on engine performance is observed when the linkage shown in photo 3 is worn and its component parts slide relative to each other. My own vehicle had a top speed of 50km/h when this particular problem decided to present itself. A temporary solution was to drill and pin the relevent components together.

4. The bushes in this linkage can wear and reduce the travel of the linkage arm.  

If a problem with the linkage is found and it needs adjustment, then it is best to slacken off the fixing clamps then start at the carburettor end and adjust the linkage movement so as to get full opening of the carburettor flange. The final adjustment is to the accelerator pedal clamp. Finally, check that the flange is fully open when the accelerator is fully depressed.

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Fascinating facts
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Early Series I owners were advised to change oil daily in severe conditions


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