berg Posted August 10, 2017 Share Posted August 10, 2017 Seems like my spec stage 3+ is starting to slip after only a few thousand miles! Or I think it is anyway It's only happened in 4th gear and doesn't do it every time strangely I can floor it in 2nd and 3rd and it's fine every time but once I get into 4th and floor it, it revs up It's done this a few times now over the last couple of times I've been out in the car I'm hoping it isn't slip but I can't see what else it can be?? Car is 570ft/lbs and spec rate the clutch at max 620ft/lbs so I would have liked a bit more than 2k miles out of it for £700 Any ideas if it could be anything else? Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted August 11, 2017 Share Posted August 11, 2017 Can't see why it only slips in 4 th gear? and only occasionally, if you havn't been doing high rev starts, then if it is slipping it could be the bell housing to crank oil seal. Herbie. Quote Link to comment Share on other sites More sharing options...
fastcar Posted August 11, 2017 Share Posted August 11, 2017 More torgue in 4th gear could be the reason! Does it slip in 5th or 6th, Have you readjusted the clutch after your run in period? Quote Link to comment Share on other sites More sharing options...
Sheefa Posted August 11, 2017 Share Posted August 11, 2017 I was going to say look at clutch adjustment mate but unlikely to be that if only slipping in one gear. As you know my clutch was slipping and turned out to be FUBARD. Bellhousing is well contained so unlikely to be oil contamination. Have you tried running it on lowest boost setting and pulling in 4th? Do that first. If it doesn't slip in 4th on low boost then likely to be clutch wear and torque slip at higher setting. I did this on mine mate and as it was slipping on all boost settings knew the clutch was screwed. Quote Link to comment Share on other sites More sharing options...
bignum Posted August 11, 2017 Share Posted August 11, 2017 Is it 5 speed you have? no inspection covers to take off and have a look inside, if there is oil contamination then the rear crank seal is directly behind the flywheel Greg. Quote Link to comment Share on other sites More sharing options...
berg Posted August 11, 2017 Author Share Posted August 11, 2017 Its an R154 5spd yeah Thanks for the ideas i will try them all and see if i can see anything Quote Link to comment Share on other sites More sharing options...
berg Posted August 11, 2017 Author Share Posted August 11, 2017 Car is up in the air at the moment so i just took the 2 metal inspection plates off the box and had a look inside No visual signs of oil in there, everything looks dry There is a drip at the bottom of the gearbox where the bellhousing meets the block, but it cant have come from inside as its completely dry in there, inspection covers on these late model R154 are quite large so theres good visibility inside Tried to trace it back up but there no signs of oil leak up top either lol Ill take it for a blast when i get time and try some different boost settings etc Quote Link to comment Share on other sites More sharing options...
Sheefa Posted August 12, 2017 Share Posted August 12, 2017 Is it 5 speed you have? no inspection covers to take off and have a look inside, if there is oil contamination then the rear crank seal is directly behind the flywheel Greg.Ahh yeah forgot R154. Sounds like clutch slip mate but definitely check low boost first. Quote Link to comment Share on other sites More sharing options...
berg Posted August 12, 2017 Author Share Posted August 12, 2017 So I've been and had a play 1.2bar is fine, 1.5 bar is also fine 1.8bar high boost I managed to get it to do it, if I'm cruising in 4th and plant it obviously it's a bit slower picking up and seems to be absolutely fine If I hard shift from 3rd to 4th and get back on that seems to be what it's not liking But out of the 3 or 4 times I done it, it only seems to have slipped once this time Have checked the box again, tiny amount of fresh oil around the bottom again but inside the inspection still bone dry so I don't think it's oil contamination I can see a bit of the clutch plate inside and to be fair it still looks like it has loads of meat on it so I'm confident it isn't worn down which I wouldn't expect anyway for 2k miles Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted August 12, 2017 Share Posted August 12, 2017 Because the fault has intermitant charachteristics then could the core splines where it slides be sticking?, you can get a "snick" on the shaft or on the clutch plate centre which will cause this problem. Herbie. Quote Link to comment Share on other sites More sharing options...
Sheefa Posted August 13, 2017 Share Posted August 13, 2017 Because the fault has intermitant charachteristics then could the core splines where it slides be sticking?, you can get a "snick" on the shaft or on the clutch plate centre which will cause this problem. Herbie. That's a good point but I don't think it was cause slipping. James aka Turtlehead had an issue with one of the cone washers which was causing engagement problems not slip. Honestly mate I think if it's fine on low and medium boost settings and only slightly problematic on high boost on hard 3rd gear pull then it is the start of minor slip. Remember I had a year of trying everything (adjustment, realignment, master cylinder checks, full clutch bleeding etc) on my clutch and symptoms were very similar at the start. Does it definitely not slip in 2nd gear high boost setting? See my started clutch slip thread a few months back for other options to try mate, can't find it on phone. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 14, 2017 Share Posted August 14, 2017 Needs the clutch removing and looking at, it can't be anything other than clutch slip if the revs go up but the speed doesn't, (except of course something MAJOR like the propshaft has fallen off.... ) Quote Link to comment Share on other sites More sharing options...
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