rulloyd Posted March 9, 2021 Report Share Posted March 9, 2021 Fresh from it's restoration, my car is driving very well with no vibration, but I notice that in reverse, it is hard to move without what feels like the prop shaft (but I have no idea) 'juddering'. It's quite bad, a bit like the problem you sometimes get with a clutch when pulling away in 1st gear (when something is wrong I mean!) As I say it feels like the drive train somewhere, certainly not Engine. I vaguely remember that it was doing this before I took it off the road 20 years ago. Prop, gearbox, diff are untouched in the restoration. Everything else new (inc clutch & rotoflex of course) Hoping someone may recognise the fault? Thank you! Rich Link to comment Share on other sites More sharing options...
Nick Jones Posted March 9, 2021 Report Share Posted March 9, 2021 Gearbox mount? (OD or not?) Nick Link to comment Share on other sites More sharing options...
rulloyd Posted March 9, 2021 Author Report Share Posted March 9, 2021 Thanks Nick. No O/D. New mounts. Link to comment Share on other sites More sharing options...
johny Posted March 9, 2021 Report Share Posted March 9, 2021 Differential rubber mounts either loose or worn? Link to comment Share on other sites More sharing options...
rulloyd Posted March 9, 2021 Author Report Share Posted March 9, 2021 7 minutes ago, johny said: Differential rubber mounts either loose or worn? Thanks Johny. Would that happen just in reverse? Link to comment Share on other sites More sharing options...
trigolf Posted March 9, 2021 Report Share Posted March 9, 2021 I used to have this symptom with my Vitesse. The problem has disappeared after swapping to CV driveshafts. I've wondered if it might be the Rotoflex couplings reacting to the torque as the rear of the car lifts slightly in reverse, rather than squatting down in forward gear? Link to comment Share on other sites More sharing options...
johny Posted March 9, 2021 Report Share Posted March 9, 2021 13 minutes ago, rulloyd said: Thanks Johny. Would that happen just in reverse? Definitely worth checking. It might be worth getting the car up on secure stands and viewing the drive train while an assistant runs the engine and operates the gears... Link to comment Share on other sites More sharing options...
PeteH Posted March 10, 2021 Report Share Posted March 10, 2021 10 hours ago, johny said: Definitely worth checking. It might be worth getting the car up on secure stands and viewing the drive train while an assistant runs the engine and operates the gears... You might find that without the loading on the wheels and suspension, that the issue would not replicate?. I recently bought a Peugeot 107, the semi auto, It has a tendancy to "wind up" on take off if you are too heavy on the throttle. Replacing the Engine mounts had (almost) cured that. But on the Axle stands it would not replicate?. Pete Link to comment Share on other sites More sharing options...
NonMember Posted March 10, 2021 Report Share Posted March 10, 2021 It's possible that one of the propshaft UJs is worn or that a tooth is damaged on the reverse idler, but check johny's suggestion first! It's probably worth a quick "check for play" while jacked up - put it in gear with engine off and see how much you can turn the diff input flange by hand. There will be a little play but it shouldn't be masses. Link to comment Share on other sites More sharing options...
johny Posted March 10, 2021 Report Share Posted March 10, 2021 yes but worth trying isnt it Pete?🤪 1 Link to comment Share on other sites More sharing options...
PeteH Posted March 10, 2021 Report Share Posted March 10, 2021 1 hour ago, johny said: yes but worth trying isnt it Pete?🤪 Oh, yes. could give you some clues, and you can check the fastenings etc. so not wasted time. Pete Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 10, 2021 Report Share Posted March 10, 2021 there are so many culprits in this problem bent rear engine plate clutch cover drive straps gearbox mounts engine mounts clutch damper springs diff mounts tie rod /trunion bushing prop UJ prop telescope and so on can be one or many this is where you need to be careful or chasing your tail can become expensive Pete Link to comment Share on other sites More sharing options...
johny Posted March 10, 2021 Report Share Posted March 10, 2021 Unusual to only do it in reverse though? Link to comment Share on other sites More sharing options...
PeteH Posted March 10, 2021 Report Share Posted March 10, 2021 1 hour ago, johny said: Unusual to only do it in reverse though? So what is different in reverse?. The only thing I can think of is that the rear axle alignment is moving. Going forward the thrust would vectored in compression onto the Rear outrigger. So going astern, the strains would then be tensile. One would assume that with all the fasteners tight and bushes in good order nothing would/should change more than a few mm?. The tendancy to "squat" when torque is applied to the rear going forward, would be reversed going astern. The rear spring fastening is not "slack" is it? or even a cracked leaf?. Pete Link to comment Share on other sites More sharing options...
rulloyd Posted March 10, 2021 Author Report Share Posted March 10, 2021 Thanks for all the suggestions. Hopefully I’ll check it over at the weekend. Going forwards is great! Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 10, 2021 Report Share Posted March 10, 2021 just dont go backwards ...solved Ha !! Pete Link to comment Share on other sites More sharing options...
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