Silvester Posted January 26, 2020 Report Share Posted January 26, 2020 Odd one, from time to time my Mk1 2litre Vitesse with OD, loses drive when I set off in 1st or reverse. It is particularly noticeable when I reverse into my garage which involves a very small upward slope; al is fine until meeting the slope with everything engaged and then drive gets lost. No change in tone of drive. Something is wrong and the only way I can think to describe it is in comparing it with a starter motor that has lost some teeth, sometimes it works and sometimes not. All thoughts much appreciated Regards Graham Link to comment Share on other sites More sharing options...
johny Posted January 26, 2020 Report Share Posted January 26, 2020 I would guess either your clutch is slipping or your overdrive and of the two I think the second is more likely. You havent used any additive in the gearbox oil have you? Link to comment Share on other sites More sharing options...
Colin Lindsay Posted January 26, 2020 Report Share Posted January 26, 2020 O/d shouldn't work in reverse, so I reckon as Johny says it's a badly worn or contaminated clutch. When you say there's no change in tone of drive you mean the engine revs don't go up? Unless it's the diff but I'm racking my brains to work out how it would lose traction on both wheels and then work again normally. Link to comment Share on other sites More sharing options...
Nigel Clark Posted January 26, 2020 Report Share Posted January 26, 2020 Does the gear lever pop back into neutral when this happens? Nigel Link to comment Share on other sites More sharing options...
Pete Lewis Posted January 26, 2020 Report Share Posted January 26, 2020 slip in reverse sounds like the OD is 'in ' when in reverse and the one way clutch is now failed some clues https://www.canleyclassics.com/technical-archive/the-d-type-overdrive pete Link to comment Share on other sites More sharing options...
johny Posted January 26, 2020 Report Share Posted January 26, 2020 surely it can just be slipping on the cone inner clutch, the one that locks the unit so it drives directly when OD is not in use? This could be due to a worn friction surface (inner) or loss of the spring tension that holds it locked.... Link to comment Share on other sites More sharing options...
Silvester Posted January 26, 2020 Author Report Share Posted January 26, 2020 Just back in from the garage and really grateful to see so many comments (some of which may be above my skill level!). I don't think the clutch is slipping, no other signs of this when I'm on the open road and I live in a hilly area! The gear lever doesn't pop back into neutral. The one item that, for me is from left-field, is the OD. Certainly, the Canley notes suggest this is a possibility that I had never considered. Time to have a look through their guide notes. Ohh and I got it to do it again this afternoon. Into reverse backing happily into the garage, then on the small slope into the doorway, no drive and plenty of revs; into first forward 10 yards and then back into reverse - no problem! Got to love a weird intermittent fault one to keep me going in the cold dark evenings. All other thoughts welcome and thank you Regards Graham Link to comment Share on other sites More sharing options...
johny Posted January 26, 2020 Report Share Posted January 26, 2020 The description of the OD operation in the Work Shop Manual which is free to download is pretty good. What was the answer on gearbox oil additive? Link to comment Share on other sites More sharing options...
Nigel Clark Posted January 26, 2020 Report Share Posted January 26, 2020 Based on latest info from Graham, sorry to say, I would suspect the overdrive. Nigel Link to comment Share on other sites More sharing options...
thescrapman Posted January 26, 2020 Report Share Posted January 26, 2020 I reckon the OD is staying engaged as well. Can you hear it (rather than just the relay) engaging and more importantly disengaging as you move the lever? Link to comment Share on other sites More sharing options...
68vitesse Posted January 27, 2020 Report Share Posted January 27, 2020 Drain the oil see if there is any metal in it and all ways check electrics very carefully. Had a drive problem on my Vitesse Mk1 J type overdrive, select first let up clutch pedal to move off but no drive, would then engage with a thump. Yellow metal thrust washer in overdrive had broken up, repaired by Overdrive repair services Sheffield who set the pressure to match my car now very smooth engaging. Regards Paul Link to comment Share on other sites More sharing options...
Pete Lewis Posted January 27, 2020 Report Share Posted January 27, 2020 this should be a D type . i would remove the valve cap nut on the top and remove the parts under it , spring ball and needle make sure the needle has a clear very small hole through its centre if blocked this will slow OD operation and can stop it dumping pressure which can hold it in out or anywhere in between while in the tunnel remove the right hand side cover and check the hole in th sol lever aligns the hole in the case when engaged the so; plunger should be free to move a small amount quite freely , IE it can get rusty and stick....again upsets what you think is actually happening you can remove the rh side cover and remove the filter for a de gunge and you have covered most easy diy OD service Pete Link to comment Share on other sites More sharing options...
johny Posted January 27, 2020 Report Share Posted January 27, 2020 I take it the OD is working well, at least Graham didnt mention having any problems with it which would have been a key pointer.... Link to comment Share on other sites More sharing options...
Pete Lewis Posted January 27, 2020 Report Share Posted January 27, 2020 Yes , at least its not a J type with a failed 0 rings on the hidden piston inside the solenoid which makes it have a mind of its own . in , out shake it all about checking a few diy jobs while TV is so bad is useful fun Pete Link to comment Share on other sites More sharing options...
GT6M Posted January 27, 2020 Report Share Posted January 27, 2020 If yer low on oil,itll slip, as in OD coming in / oot but this will be felt. Overdrive will slip in reverse, had it me self, was also slipp,n in forad gears AND, this was with a new re done cone clutch took it oot, n left it for ages, And, just took the aforementioned OD t,bits an hour ago, cos im re dooing it, and both frictione clutches are loose, spinning on steel carrier glue has de bonded or what ever its called reason it just slips noo an then is maybe cos 1, no much load on 2 it sort of binds on whenst stopped as springs will pul it in, then suction takes owa for a wee while till it breaks loose Ive just been fart,n aboot seeing why it would sometimes work and other not this only thing I can see, or sumise. took a few pics for the non believers,!! bung em up later on Link to comment Share on other sites More sharing options...
Silvester Posted January 27, 2020 Author Report Share Posted January 27, 2020 Hi guys thank you for the additional thoughts; to address some of the questions asked; no additive has been added and to my knowledge, the overdrive had been working normally on 3rd and 4th. Given the broad consensus around the overdrive, I'm going to address the DIY suggestions this weekend. If this fails to resolve things, having read up this now, the risk is that I could create further damage. This being the case, the contingency will be off to Chic Doig who is my most local expert. While I prefer to have a go at most things if it comes to a gearbox out and repairs to the overdrive unit I suspect I've run out of talent 🙂 my thanks to one and all Best Wishes Graham Link to comment Share on other sites More sharing options...
Pete Lewis Posted January 28, 2020 Report Share Posted January 28, 2020 one thing is the bleed on the slave in the uppermost hole ??? and push the slave piston fully back inside to reduce internal volume when bleeding ( needs pumping a few times to reposition ) Link to comment Share on other sites More sharing options...
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