TR Paul Posted March 20, 2022 Report Share Posted March 20, 2022 My 1970 TR6 PI (TR0y), has been making some interesting/irritating noises, coming from the general direction of the rear axle/suspension. This started last summer (as I was leaving the IWE at Malvern), as a squeek, only detectable at low speed, & has progressed to being a noise somewhere between a squeaking & scraping noise, which only occurs, when the car is 'under load'. I have investigated,greased, changed & eliminated wheel bearings(hubs), drive shaft UJs etc. I've checked & greased the propshaft UJs & its' sliding joint (this unit was reconditioned 3 years ago when I had the G/Box & O.D rebuilt & replaced). The noise is especially noticeable when accelerating from junctions, or going over speed humps: However, I can drive along a straight, quiet piece of road at 25-30mph with this noise in 'full chat', & it will instantly disappear if I knock the lever out of gear, & let the car coast. Does anyone have any ideas,anything I might have missed, or is it time to remove the diff, & have a look at the mounting pins. As ever, your advice & knowledge, will be more than appreciated, Best wishes, Paul Quote Link to post Share on other sites
RogerH Posted March 20, 2022 Report Share Posted March 20, 2022 Hi paul, you may be onto the cause. The pins and the thin metalwork around them can make all sorts of noises when they start to fail. You should be able to see and feel the area without removing the diff. Roger Quote Link to post Share on other sites
TR Paul Posted March 20, 2022 Author Report Share Posted March 20, 2022 Thanks Roger. I had discounted the diff pins, earlier in this situation, as I had been turning the drive shafts 'against' opposite wheel on the ground (engine in gear)- if that makes sense(?)- to test the U.Js, & could only see slight movement of the diff, as it flexed on its' rubber mountings, but now as most other possibilities seem to have been eliminated, I will definitely be following you guidance. Many thanks, Paul. Quote Link to post Share on other sites
RogerH Posted March 20, 2022 Report Share Posted March 20, 2022 Hi Paul, I would be very surprised that you could make the diff rubber bushes 'give' a little with hand pressure. Roger Quote Link to post Share on other sites
TR Paul Posted March 20, 2022 Author Report Share Posted March 20, 2022 Hi Roger, I see what you mean, maybe i didn't write that very well It was as I was turning the n/s wheel, with the car jacked to one side, so the o/s wheel was on the ground, to see if there was any (unwanted) movement in the UJs... hope that makes sense now! Cheers, Paul. Quote Link to post Share on other sites
RogerH Posted March 20, 2022 Report Share Posted March 20, 2022 yes. Quote Link to post Share on other sites
stuart Posted March 20, 2022 Report Share Posted March 20, 2022 Have a good look at the front diff plate too as they split at the bolt holes round the prop. Stuart. Quote Link to post Share on other sites
Z320 Posted March 20, 2022 Report Share Posted March 20, 2022 Oil in the diff? Quote Link to post Share on other sites
TR Paul Posted March 20, 2022 Author Report Share Posted March 20, 2022 Thanks for the diff plate tip, Stuart. I will look at that. It was new, in 2014 (the old one snapped, with a loud 'bang'!, but we all know about 'repro' parts... 'Z', thank you for your oil tip. I had thought that it could be the diff itself. I did check the oil level up in February, & I've done less than 50 miles, since, but an easy check/fix, so well worth looking at! Again thank you all for your sage advice!, Cheers, Paul. Quote Link to post Share on other sites
astontr6 Posted March 21, 2022 Report Share Posted March 21, 2022 17 hours ago, TR Paul said: Hi Roger, I see what you mean, maybe i didn't write that very well It was as I was turning the n/s wheel, with the car jacked to one side, so the o/s wheel was on the ground, to see if there was any (unwanted) movement in the UJs... hope that makes sense now! Cheers, Paul. I had the squeaks from the rear of my TR and I hunted high and low to find out what it was, In the end a TR specialist tracked it down to the Radius arm pivot bolts through the bushes which were rusty. He said that he found this problem on other TR's where the inside bush was M/S and not S/S. Polished up the bolt shanks and the inside of the M/S bush greased them up with copper grease. Noise gone!!! Bruce Quote Link to post Share on other sites
TR Paul Posted March 21, 2022 Author Report Share Posted March 21, 2022 Hi, Bruce thanks for your Interesting ideas: when you say Radius arms, do you mean the trailing arms? if so, this is something I will be investigating, but the noises disappear when i let the car coast, so I won't be getting my hopes up too high! Best wishes, Paul. Quote Link to post Share on other sites
Z320 Posted March 21, 2022 Report Share Posted March 21, 2022 11 hours ago, astontr6 said: I had the squeaks from the rear of my TR and I hunted high and low to find out what it was, In the end a TR specialist tracked it down to the Radius arm pivot bolts through the bushes which were rusty. He said that he found this problem on other TR's where the inside bush was M/S and not S/S. Polished up the bolt shanks and the inside of the M/S bush greased them up with copper grease. Noise gone!!! Bruce worn telescopic shock absorber, if fitted, can also squeak badly…. Cheers, Marco Quote Link to post Share on other sites
astontr6 Posted March 21, 2022 Report Share Posted March 21, 2022 10 hours ago, TR Paul said: Hi, Bruce thanks for your Interesting ideas: when you say Radius arms, do you mean the trailing arms? if so, this is something I will be investigating, but the noises disappear when i let the car coast, so I won't be getting my hopes up too high! Best wishes, Paul. Yes I do! Bruce. Quote Link to post Share on other sites
rcreweread Posted March 21, 2022 Report Share Posted March 21, 2022 Paul -are you sure the propshaft isn't just fouling a piece of bodywork when accelerating. with the torque twist causing the fouling and then on lift off, the torque twist ceases and nothing touches. if it was a problem in the drivetrain, I would have thought that would still present itself when coasting in neutral Just a thought Cheers Rich Quote Link to post Share on other sites
TR Paul Posted March 22, 2022 Author Report Share Posted March 22, 2022 Hi Rich, nice to hear from you again. I had the rear end of the car on axle stands at the weekend, and had the engine running whilst in second gear, at around 2000rpm.... not a squeak.. I have a day off work tomorrow, and I hope to be putting your idea to the test, as well as Marcos' thoughts regarding telescopic dampers, as well as the other ideas that people have most generously put forward on the forum. I will report back with my findings! Cheers, Paul. Quote Link to post Share on other sites
TR Paul Posted April 21, 2022 Author Report Share Posted April 21, 2022 Hello, I know it's been a while since my last post, but i have investigated this issue further: The diff mounting pins seem solid enough, nothing seems to be fouling the propshaft or driveshafts & i can't detect any (unwanted!) movement in the T/A bushes - I'm starting to suspect that the noise might be coming from the T/A pivot bolts, rubbing against the bush inserts, as h-lighted by Bruce. Cheers, Paul. Quote Link to post Share on other sites
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