A Type gearbox and overdrive recon

[Guest]

Hi all, when I bought my MK 1 stag last year I got various receipts with it including one for a recon gearbox and recon overdrive bought from Cardinal Triumph in Newcastle in 1987(which equates to 6000 miles ago). On the basis of this I did not think I would have any trouble in this dept. How wrong I am as I have a o/d that wont stay in when it gets hot (tried the wiring,solonoid etc to no avail) and a gearbox that makes a horrible noise untill I dip the clutch and then it dissapears.

Ive give up with the overdrive,but does anyone know what particular partmight beat fault in the gearbox.

Bit reluluctant to go down the recon routefor obvious reasons.

Thanks for any help in advance.

[stustag]

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Hi Nibby

Sounds like you've got a real problem 'box their! Suggest you either stump up for one from Rimmer or get one off e bay from stag or triumph 2000/2500 MK2 which I am fairly sure will fit.

I have had five manual triumph 2000 and stag and never had a problem with either OD or gearbox except for the odd soleniod going wrong!

Whoever rebuilt it either didn't or used poor quality parts.

regards

Stu

[redstag]

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Although almost identical in appearance the box from the 2000/2500 will not fit as the input shafts are different. There are also other internal differences with bearings, ratios etc.

Pete.

[DJT]

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nibby wrote:

I have a o/d that wont stay in when it gets hot (tried the wiring,solonoid etc to no avail)

and a gearbox that makes a horrible noise untill I dip the clutch and then it dissapears.

Nibby,

What oil are you using? Recommended is EP90, although some do use normal engine oil. If the o/d is not staying in it is either electrical or hydraulic. You say you have checked the wiring. Does this include the wires to the switch? They have an annoying habit of breaking internally where they enter the gear lever. This can be an intermittent failure as the o/d works when the broken ends re-join. This may not be happening when things get heated.

You have checked the solenoid (tried another?) so that should be OK.

If hydraulic it means the internal pump isnt producing enough pressure. If the correct oil doesn't work it probably means a strip down.

You have a Mk1, so it should be an A-type o/d. Have you checked/cleaned the operating valve on the top of the o/d casing? Remove the coin tray in front of the gear lever. Under here is a rubber bung. Remove this and you will see a black hex plug on top of the casing (Part 268095 in the diagram below). Inside this is a valve, spring and ball bearing. The valve can get blocked. Pull it all out (careful - spring and small parts!), clean, re-seat the ball and put back.



The noisy box which quietens when the clutch is dipped indicates a worn input shaft bearing. If an oil change doesn't quieten it down (unlikely) then again, only a strip down will fix it (o/drives don't like sawdust or banana skins, so I won't suggest those methods:shock. Unfortunately there are some 'iffy' bearings about, and this front one takes all the load.

As has already been said, a 2000/2500/TR6 box won't fit. The input shaft is different. The most obvious visual difference is that the Stag box won't stand on end as the input shaft extends from the bell-housing. The other boxes will stand on end.

You then have the different o/drives. Early Stags were fitted with the A-type, later ones had the J-type. The 'box internals are different.

Unfortunately you have no recourse to the rebuilders after all this time (warranties are usually 12 month/12000 miles whichever comes first) , and CTS no longer exist. Although annoying, this shouldn't lead to disastrous failure. 'Boxes can go on for years with noisy bearings.

Hope some of the above helps.

Dave

[Guest]

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Thanks everyone for the advice.

Dave Im using ep9o and have cleaned the operating valve but not the non-return valve,I dont know if this would affect it?

It also has this anoying habit of the revs droping off on coast at alarming rate,as if the engine and gearbox are disengaged and then re-engaging sending the revs racing up at an alarming rate.(im worried this surge in revs aint doing the engine any good)

Just a note on the actual gearbox itself,what sort of noise and symptoms do you get with a worn clutch release bearing?

[redstag]

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On the overdrive it may be worth checking the sump filter and also that the solenoid mechanism is adjusted correctly

If you go down the route of rebuilding the 'box yourself then heed Dave's advice rereplacementparts. The kit I bought from Rimmers about 3 years ago consisted of no-name bearings and synchro rings that didn't work. Replacedthem with original BL items and they work perfectly. I don't know what the quality is of the synchros currently on the market but if your ones work ok you may be better off not changing them.

Pete

[Sheepdip]

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Nibby, I recently carried out a lot of work on an A type box after converting from manual (have a look at the forum artice A type overdrive relucatnce to engage ). I would suggest checking the solenoid off the car and make sure it works properly - mine "clicked" at standstill but wasn't working at speed.

As well as pickup strainer, check/reseal the one way valve inside the overdrive and next to accumulator. The workshop manual details this, IT IS NOT AN EASYJOB while in the car, I would suggest waiting till winter quiet time. If this fails then its likely to be pump/accumulator and probably xchange box.

re rattle, I had similar- it went with slight touchno pressureon clutch pedal, which suggested the release bearing was touching on the pressure plate when released. Don't know why and never got chance to find out (another story). If it only goes when clutch fully depressed then agree with others its gearbox bearings.


sheepdip

[Guest]

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I might leave it to winter now and have a look at some of the suggestions then,try and make the most of the indian summer we seem to be having.

Thanks everyone.

Sheepdip will you be at the manger (Bury st Edmunds) tommorow night,might try and get along if knock off work in time.Hope to see you there.

[Sheepdip]

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Hiya Nibby, look foward to seeing you there.