Guppy916 Posted September 2, 2018 Report Share Posted September 2, 2018 Hi Guys, I have a MK3 GT6 which when I roll backwards out of gear, I get a faint knocking noise, so I thought UJ's or loose bolts, so I v'e been under the car checked the diff oil, gearbox oil, both ok, all nuts and bolts are tight, no play in the UJ's, but a little play in the sliding joint on the prop shaft but I can't see this as my problem, any ideas please is the prop a serviceable part or do i just buy a recon unit Link to comment Share on other sites More sharing options...
Clive Posted September 3, 2018 Report Share Posted September 3, 2018 You won't feel any play in a driveshaft UJ unless you undo the spring eye bolt. You may see a witness mark though if the uj cup is spinning in the yoke. And this is definitely only in reverse? and a knock not a rubbing? Which rear suspension is fitted? And what wheels/tyre size? It may be worth getting the car up on decent axle stands, leaving the rear wheels on and getting an assistant turning them. That way you may be able to pin the noise down. Then again it may need the wheels in the on-road position, access to a pit may help then (you never know) Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 3, 2018 Report Share Posted September 3, 2018 prop telescopes do wear quite badly , its repairable if cut off and a replacement welded and balanced by a prop specialist buying a complete replacement is probably more ecconomical is the knock from brake shoe contact with the drum ???? pete Link to comment Share on other sites More sharing options...
Guppy916 Posted September 3, 2018 Author Report Share Posted September 3, 2018 Non Rotoflex guys, Thats a good call Pete i shall drop the drums off and check for any rub marks Clive the boss thinks she heard it once when we went round a 90 deg junction 15x175x55 I have a couple of rub marks on the front wheel arches, this only happens when i'm on full lock though, Any ideas where to purchase a new prop shaft I've got Rimmer's at Part No.: 213151 £239 Link to comment Share on other sites More sharing options...
Gully Posted September 3, 2018 Report Share Posted September 3, 2018 I've seen people recommend Dave Mac Propshafts - they pop up in response to a Google search. Gully Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 5, 2018 Report Share Posted September 5, 2018 canley classics £166 +Vat 213150/151 if its heard on corners its more likely drive shaft UJ with float . canley sell thicker circlips to solve this ( assuming the uj is sound ) remember a prop turns around 4 times faster than the road wheels so a prop knock frequency is much faster than a road wheel speed rotational knock Pete Link to comment Share on other sites More sharing options...
Clive Posted September 5, 2018 Report Share Posted September 5, 2018 I believe Dave Mac makes them for CC, so just compare the 2 prices? Possibly have alook at tie rod bushes, spring eye and so on. Changing the direction of movement reverses the normal forces. Assuming long shafts, so shouldn't be wheel to tie-rod contact ( got that when I used 15" wheels on a herald based spartan) Link to comment Share on other sites More sharing options...
haggis Posted September 5, 2018 Report Share Posted September 5, 2018 Hi guppy, may be a long shot but just check there’s nothing rolling around the boot floor pan or rear seat pan, I had a problem yesterday where I thought I had a major problem and after 3 hours under the car found a can of Heineken from Le Mans rolling around in the back! ? you never know. Good place in Feltham London if you are south and want a good prop service. Hag Link to comment Share on other sites More sharing options...
Guppy916 Posted September 5, 2018 Author Report Share Posted September 5, 2018 Cheers Hag, I've been talking to propshaft services in Feltam today, it definitely isn't a beer can as the only thing in the spare wheel well is the fuel pump and filter, the noise is more a solid sound, than something rolling around lose, I see your in Hampshire , Link to comment Share on other sites More sharing options...
Ian Foster Posted September 6, 2018 Report Share Posted September 6, 2018 Hi Guppy Propshaft Services in Feltham, shortened and balanced a non OD shaft for me in about 1980, when I converted my GT6 to OD. It's still on the car today about a 100k miles later, so they must have done a good job !. Ian F Link to comment Share on other sites More sharing options...
Guppy916 Posted September 6, 2018 Author Report Share Posted September 6, 2018 Hi guys, Paul has quoted about £100 +vat with a three day turn around, I think they are about an hours drive from me, so it's a no brainer I shall pop if off over the winter months so it's ready in the spring, or if the knock gets any worse i'll do it now Link to comment Share on other sites More sharing options...
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