Mollysdad Posted August 7, 2016 Share Posted August 7, 2016 Vitesse mk2Hi,As the title says, the overdrive engages ok if not accelerating but seems to disengage when I put my foot down. Is this a knackered overdrive or are there tricks I can try to get it to work?Thanks Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted August 7, 2016 Share Posted August 7, 2016 Seems to disengage in that you feel it drop out in the same way that it would it you'd switched it out or more that the revs rise a bit akin to clutch slip? If you back off, does it come back in?Could be as simple as a wiring issue being tweaked by the torque reaction under power. Gearbox oil level ok? OD switch in gearstick or on the column?Nick Quote Link to comment Share on other sites More sharing options...
nang Posted August 8, 2016 Share Posted August 8, 2016 Had a 2500 that drove me insane doing this. Turned out to be the switch on the gear stick. In frustration one day I took the switch cover off, pulled the two wires out and drove down the road holding the two together. It worked > All of my J type problems have been electrical.Tony. Quote Link to comment Share on other sites More sharing options...
Mollysdad Posted August 8, 2016 Author Share Posted August 8, 2016 Quoted from Nick Jones Seems to disengage in that you feel it drop out in the same way that it would it you'd switched it out or more that the revs rise a bit akin to clutch slip? If you back off, does it come back in?Could be as simple as a wiring issue being tweaked by the torque reaction under power. Gearbox oil level ok? OD switch in gearstick or on the column?Nick Hi, yes oil level is fine but I haven't changed it and wondered if a refresh might help, suppose it can't 'not help'.Will have a drive today and see if I can tell if it's more slipping than dropping out but I thought it felt like it was dropping out like I'd switched it off and came back in again as I backed off but now I'm not sure! Quote Link to comment Share on other sites More sharing options...
Hogie Posted August 8, 2016 Share Posted August 8, 2016 Hi Mollysdad, I don;t know the layout of the Vitesse but this can happen on the TR4A/5/6 cars if the rubber boot around the gearstick is stiff or badly placed.Also if the switches on the top cover are only just making, any movement of the gearstick could cause that effect.Does it happen in ALL the OD gears.Roger Quote Link to comment Share on other sites More sharing options...
Mollysdad Posted August 8, 2016 Author Share Posted August 8, 2016 ok, I changed the oil just in case and took out for a spin.It seems fine in 3rd, holds in even under acceleration and cuts out at the flick of the switch (on stalk). In 4th however it seems to drop out on acceleration and cut in again when backing off so I assume there must be a wiring issue on the gearbox that is only apparent when in 4th.Will have to pull the cover and take a look. Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted August 8, 2016 Share Posted August 8, 2016 Could be any of the under tunnel wiring really but the 3rd ok, 4th not makes me suspect the limiter switch on the end of the selector rod.Nick Quote Link to comment Share on other sites More sharing options...
Mollysdad Posted August 8, 2016 Author Share Posted August 8, 2016 Quoted from Nick Jones Could be any of the under tunnel wiring really but the 3rd ok, 4th not makes me suspect the limiter switch on the end of the selector rod.Nick Thanks Nick, will take a look tomorrow. Quote Link to comment Share on other sites More sharing options...
MDofTW Posted August 8, 2016 Share Posted August 8, 2016 I'm having much the same problem on my 2.0 Spitfire. I can hear the solenoid clicking when engaged (gear stick switch), and it will eventually drift in (slipping clutch sounds just right), but after a few seconds and quite reluctantly. Then under power, and usually when hot, it will slur out- but onlysometimes. Back off the power, and it'll go back in, and stay in for miles. Switching out will be immediate. I think happens in 3 as well as 4, but will check tomorrow. I reckon low oil. If it is, am I running the risk of damaging it?Thx all. Steve. Quote Link to comment Share on other sites More sharing options...
Mollysdad Posted August 9, 2016 Author Share Posted August 9, 2016 Quoted from Nick Jones Could be any of the under tunnel wiring really but the 3rd ok, 4th not makes me suspect the limiter switch on the end of the selector rod.Nick correct yet again Nick. Thanks.Have ordered a new one but the quality will probably be crap! Quote Link to comment Share on other sites More sharing options...
RobPearce Posted August 9, 2016 Share Posted August 9, 2016 MDofTW : That sounds like a different problem to Mollysdad's, most likely down to worn out hydraulics, low oil level or very old oil.The very definite cutting out and back in sounds electrical, probably the inhibitor switch like Nick suggests. I had something similar on a Stag, which turned out to be due to a previous owner having fitted two washers on the inhibitor switch instead of one - the result being that it only just closed when cold and failed to close once the gearbox housing had expanded as it warmed up. Quote Link to comment Share on other sites More sharing options...
MDofTW Posted August 11, 2016 Share Posted August 11, 2016 Thx all; agree with you Iain, though can actually hear it clicking too (softwood, roof always down). Rob, agree too, Oil check to be made over the w/e, but I think oil state / level is the root of the problem. Will advise when poss. Cheers. Steve s Quote Link to comment Share on other sites More sharing options...
MDofTW Posted August 11, 2016 Share Posted August 11, 2016 Sorry, bloody auto text - s/be "soft top", not softwood! Quote Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 16, 2016 Share Posted August 16, 2016 the inhibitor switch is set with poor shim washers , or if nowt else bend the bracket a littleif set to just about make contact it doesnt take much temperature and tower /cam / bracket wear and tear to allow drop out when hotsome of the SA range switches can be uncrimped and cleaned out they can be very 'green' inside worth a try Pete Quote Link to comment Share on other sites More sharing options...
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