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Post by simont485 on Sept 28, 2018 16:37:17 GMT
HI all Has anyone come across this before.....the throttle pedal doesn't return when kickdown is used!! A bit un-nerving when it happens... It feels like the pedal is going over too far and will not return and stays buried in the carpet. A couple of photos show this. The lower photos shows the pedal in the down position and it has to be lifted up to return it. Any suggestions?
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Post by eightofthem (Andy) on Sept 28, 2018 17:50:09 GMT
It could be the throttle cable. " inner cable " has corroded inside the sleeve thus sticking when pulled past its normal operating range, it could also be the bolt that holds the top pedal arm having the same issue.
Start with the cable by undoing from both ends, or simply remove it any pull it in and out whilst free, they are available new. The locking nut on the inside has already come off by the look of it, so your nearly there for removal.
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Post by richardlamsdale on Sept 28, 2018 17:53:59 GMT
It looks to me like the carpet is sitting too low behind the pedal lever pivot, stopping the pedal returning. In the top photo the pedal lever looks to be squashing the piping on the carpet. If not that, then it could be the cable, or the carbs or kick-down return springs could be damaged/missing, but I'd start with the easiest: the carpet.
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Post by Phil Nottingham on Sept 29, 2018 7:12:11 GMT
I have had this very problem
If the other suggestions do not work it may be the floor pan had been distorted by careless jacking/poor repairs. It may need pushing up or down very slightly. You need to observe its operation inside the car - it will be obvious if adjustment is required.
This is a VERY dangerous fault that needs sorting before driving it
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Post by simont485 on Sept 29, 2018 8:08:35 GMT
It looks to me like the carpet is sitting too low behind the pedal lever pivot, stopping the pedal returning. In the top photo the pedal lever looks to be squashing the piping on the carpet. If not that, then it could be the cable, or the carbs or kick-down return springs could be damaged/missing, but I'd start with the easiest: the carpet. Where are the kick down return springs???
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Post by richardlamsdale on Sept 29, 2018 17:12:07 GMT
Hi Simon, I'm not sure which model you have but on the P5B there were two designs for the kick-down cable - short and long. The short version has a return spring on the bracket that attaches to the engine block (its quite well hidden at the rear of the engine on the left side). The longer version attaches the kick-down cable to a bracket on the inlet manifold on the left of the engine - I don't think that had a separate return spring, but I may be wrong (my car has the short version). The Workshop Manual only shows the long version.
There are also return springs on the carb linkages, and I'd say they're more likely to be the issue than the kick-down cable spring (if you have the short version), or as mentioned by others the cable itself may be stiff. But if the throttle cable assembly is stiff, one missing spring might just make the difference between the pedal returning or not.
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Post by simont485 on Sept 30, 2018 8:15:16 GMT
1973 K reg model
So its not the carpet that just looks like its in the way in the photos. The cable moves freely.
With the cable disconnected the pedal still sticks in the down position. it is like it is travelling to far.
One thing that isn't right is the spring loaded button under the pedal......the pedal gets nowhere near this when fully down. The spring button is at its fullest extent so can adjust any further.
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Post by richardlamsdale on Sept 30, 2018 10:01:17 GMT
At least that eliminates a lot of options - it must be the pedal itself. Maybe what Phil mentioned earlier, or the pivot is rusted?
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Post by simont485 on Sept 30, 2018 10:17:33 GMT
Found there was more adjustment to the spring button under the pedal......now seems to be ok!!
Many thanks for your responses!
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Post by enigmas on Sept 30, 2018 13:07:29 GMT
Isn't the spring button under the pedal purely there to indicate to the driver the kickdown position of the throttle! It's not been placed there to return a 'sticking' throttle.
If it were mine I'd be checking the items already suggested (i.e, a tight or binding cable, a missing or incorrectly fitted return spring, linkages set at incorrect geometric angles).
The throttles and the pedal primarily need to be returned at the source of where the cables or mechanism opens the throttle blades. Unless it's setup like this the mechanism right up to the pedal won't return properly and will no doubt stick partially open any time soon. The throttle pedal primarily needs to be pulled back not pushed back at the pedal as attempting to push a cable back really isn't a mechanically sound method of return.
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Post by simont485 on Sept 30, 2018 16:29:42 GMT
Good point.....but.....
With the cable disconnected from the pedal the same thing still happens.....the pedal sticks when pushed all the way down....with the spring button adjusted the pedal is fine.
The other automatic cars I have do not have a mechanical device to indicate activation of the kickdown......so why does the Rover??
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Post by petrolhead allan on Sept 30, 2018 16:39:54 GMT
Have a look at Phil N's reply.
I too have had the same thing. With the cable disconnected, the pedal would go 'over centre' when depressed and not return when released.
I discovered that the floor was indeed bent! The judicious use of a hammer (downwards) adjacent to the pedal allowed the pedal to move freely again with no binding and immediately return when released.
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Post by enigmas on Sept 30, 2018 23:45:36 GMT
Good point.....but..... With the cable disconnected from the pedal the same thing still happens.....the pedal sticks when pushed all the way down....with the spring button adjusted the pedal is fine. The other automatic cars I have do not have a mechanical device to indicate activation of the kickdown......so why does the Rover?? You'd need to ask the Wilks Brothers (I think the Factory were fascinated with complex mechanical linkages from my estimation) it was one of their design features...at the time they were upmarket cars with all sorts of added features that separated them from more utilitarian cars. My Mk3 P5 has the same kickdown feature but has a complex fully articulated mechanical linkage. Only the P5Bs went to a cable throttle design. I believe the first thing to check/fix (if required) would be the smooth movement of the throttle pedal with the cable disconnected. Then attach the cable and pursue the 'stickiness' issue further along as it transitions to the carb linkages. Discount each movement transition along the entire throttle mechanism until the issue is found and resolved.
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