super_supra Posted October 5, 2014 Share Posted October 5, 2014 Just rebuild the supra with forged bottom end, and now driving around running it in a bit, and have noticed when gearing down and slowing up for junction/roundabouts a whining noise from what sounds like gearbox/clutch area. I can’t hear the noise at any other time e.g. under acceleration or letting off at higher speeds. I have a 6 speed manual that I changed the oil in about 3 years ago but has only done 2-3000 mile since, I am also running a carbonetic triple plate clutch but when I hear the noise if I press the clutch in the noise disappears. It also has a new spigot bearing fitted when I rebuild the car. Any idea’s what it could be would be greatly appreciated, hoping tits not the box but thought it would be more of a noise under acceleration if the box was knackered. Cheers Neil Quote Link to comment Share on other sites More sharing options...
simbasupra Posted October 5, 2014 Share Posted October 5, 2014 I have a similar noise after I replaced my clutch a few years ago. I installed a new spigot bearing and trd transmission mount at the same time. I was thinking it might of just been the trd mount transfering more noise. However im now wondering if the spigot bearing is installed incorrectly? I would be interested in other peoples opinions as currently rebuilding my engine so could look at this fault again too. Quote Link to comment Share on other sites More sharing options...
super_supra Posted October 7, 2014 Author Share Posted October 7, 2014 Been doing some looking on the internet and found that it might be the rear diff pinion bearing's. That is the only time people describe a noise when decelerating only. My whining noise seems to be wheel speed related, as when I change from 3rd to 2nd the noise gets louder but does not get fasted with the revs it stays in tune with wheel speed. So diff sounds like a good place to start but it’s a bit wet at the moment to get under the car and check for any play in the pinion shaft. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 7, 2014 Share Posted October 7, 2014 Are any calipers binding and heating up? Quote Link to comment Share on other sites More sharing options...
super_supra Posted October 7, 2014 Author Share Posted October 7, 2014 I have not check them but there is a chance as the car has been sat for a year while I did the engine, but my mate never mentioned anything when he MOT'd it, but I will check them before striping anything. If my diff does need rebuilding is that something you can do Chris? And what sort of price would I be looking at? Cheers Neil Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 7, 2014 Share Posted October 7, 2014 If the actual crown wheel and pinion are goosed you need another unit. If it's bearing noise it can be rebuilt by me. Iwould check all caliprs for heat build after a few miles with minimal brake usage. though. I had something similar a while back. Quote Link to comment Share on other sites More sharing options...
super_supra Posted October 7, 2014 Author Share Posted October 7, 2014 The noise sounds like its got a straight cut gearbox in it but only decelarating at slower speeds. Quote Link to comment Share on other sites More sharing options...
Sukhy Posted October 7, 2014 Share Posted October 7, 2014 I get the exact same noise when de-celerating and I'm also running a Carbonetic twin plate carbon clutch. I only noticed the noise after the clutch was changed and I changed the gearbox mount to a brand new OEM one too. Although, I do get like a metal grinding type noise when the clutch is pressed in but put it down to how noisy twin plate clutces are. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 7, 2014 Share Posted October 7, 2014 Certainly sounds like missing input shaft spigot bearing, or wrong one fitted, but you have that covered. If it turns out to be g/box internals I would suspect the input shaft bearing. Quote Link to comment Share on other sites More sharing options...
super_supra Posted October 7, 2014 Author Share Posted October 7, 2014 Certainly sounds like missing input shaft spigot bearing, or wrong one fitted, but you have that covered. If it turns out to be g/box internals I would suspect the input shaft bearing. Is there more than on spigot bearing available? When I replaced it I get it from Toyota and from what I can remember the looked the same. Come to think of I made a clutch centralizing tool and use the old bearing to find the inner diameter of the bearing and it worked a treat when fitting the clutch so would of guessed it the same size, so pretty sure I have the correct spigot bearing in mine. If it was the spigot or input shaft would the noise not be more engine rev related as mine defiantly seems more wheel speed related. Cheers Neil Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 7, 2014 Share Posted October 7, 2014 I would imagine the 5 speed boxes could well use a different spigot bearing ID to the six speed box. Either would obviously go into the crank recess, as the cranks are the same N/A and TT. Did you ensure it was for the 5 speed box? Let me check part numbers.... Actually, the 5 speed box and the 6 speed box use the same spigot bearing part numbers, so that rules that out... Quote Link to comment Share on other sites More sharing options...
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