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Gearbox oil leak


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Hi Malcolm,

do you know where on the GB the leak is.

If it is the selector rods then no need to remove the GB. Simply take the top cover off and do any work on the bench.

The attachment plate between GB and OD is a prime candidate for leaks as these are known to crack (I think that is my problem).

 

As for your leak stopping wonder fluid - don't go there. A basic GB may well appreciate the stuff but an OD wouldn't.

 

Roger

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Oil drips from  hole in the bottom of the bell housing, and is definitely  gearbox rather than engine oil.

Possibly talking complete twaddle. But as the drips continue long after the car has been run.
I suspect leak is from the layshaft end cover gasket. Which I should imagine is below the oil fill level.
Rather than the main shaft/pinion cover seal/gasket. Which I imagine is above the oil fill level.


Just wondered if anybody had tried a leak stop "snake oil". And more importantly if their overdrive still functioned afterwards.

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The rear scroll seal on the crank leaks when stationary. But that would be engine oil.

The layshaft gasket is fixed down with a plate - I can't see that leaking; but then there is oil behind there.

In my opinion don;t use the leak stopper

Roger

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I wouldn't use the wonder oil leak fixer either, as it's impossible to know what effect it may have on the O/D until it's too late. The gearbox and overdrive on my TR6 used to leak plenty until I realised it had no breather. Once I installed a breather (on the O/D casing), it stopped dripping though it does still keep a light covering of oil.

By the way, I'm a bit of a pedant... The TR6 has a lip oil seal on the back of the crank, not that it's relevant to a leak of gearbox oil.

Nigel

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Hi Roger & Nigel,

You have rather confirmed my concerns as to leak stop. Can see it potentially solving one problem and creating a far bigger one (as in us overdrive)

I will also check out breather, as in is there one and is it able to.

I have monitored the leak for a while, its not disasterous,  more of a niggle, and plays on the mind a tad, if going any distance abroad. Whilst I have carried out many road side emergency  repairs in odd parts  of the continnog, topping up gearbox oil might be a bit tricky.

Malcolm

 

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Hi Malcolm,

the breather on the OD may well be disguised as a cylindrical 'thingy'

See pic below - it is the arrow at the bottom

Also consider drilling a 1/8" holes in the front left corner of the top cover - on eht epic below you can just see the head of a loose fitted split pin under the line

pointing at the pointing at reverse

Roger

P1050269a.jpg

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1 hour ago, Malcolm Clarke said:

Hi Roger & Nigel,

You have rather confirmed my concerns as to leak stop. Can see it potentially solving one problem and creating a far bigger one (as in us overdrive)

I will also check out breather, as in is there one and is it able to.

I have monitored the leak for a while, its not disasterous,  more of a niggle, and plays on the mind a tad, if going any distance abroad. Whilst I have carried out many road side emergency  repairs in odd parts  of the continnog, topping up gearbox oil might be a bit tricky.

Malcolm

 

A bad leak in the GB/OD made me paranoid about the oil level dropping too low. Checking it while travelling was inconvenient to impossible. So I drilled a hole in the tunnel cover opposite the fill plug so the oil level could be checked without jacking up the car and crawling underneath it. I fitted a hex head fill plug and the whole checking/fill process takes only a couple of minutes. The hole in the tunnel cover can covered with a jack hole plug. Even though the OD leak has been fixed, I still appreciate the ease that the oil level can be checked.

Berry

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Hi Berry,

I have a hole in the tunnel cover but I still have to remove the H frame and carpet to use it-- checking from underneath proved to be much easier.

I'm interested in what you've done to access the hole through the carpet. This would save me jacking up the car, overfilling, dropping to drain excess oil the jacking back up again to replace the plug.

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Hi Mike,

the Jon Skinner carpet sat has the carpet over the tunnel in two sections.

The front section stops just before the 'H' support, so the carpet can be lifted along with the under felt. This allows access to the tunnel access holes.

 

Roger

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Maybe find out where the leak is coming from first. Clean as much as the gearbox as you can and drive the car around  before inspecting again. You might need to  blow some talcum powder on suspected leak sources.

When you fix the leaks it ight be a good idea to drive around a bit with the H frame & tunnel removed - feels and sounds a bit  like Ken Miles at Le Mans but at least it saves having to dismantle these items again if the leak's not  repaired. 

Edited by Mike C
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1 hour ago, Mike C said:

Hi Berry,

I have a hole in the tunnel cover but I still have to remove the H frame and carpet to use it-- checking from underneath proved to be much easier.

I'm interested in what you've done to access the hole through the carpet. This would save me jacking up the car, overfilling, dropping to drain excess oil the jacking back up again to replace the plug.

I am able to just lift the carpet to expose the plug without having to remove the H frame. My carpets probably look a bit frumpy, but are not very visible to other eyes. Also, since I am a yank, it is on the drivers side.

Berry

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3 minutes ago, dingle said:

I am able to just lift the carpet to expose the plug without having to remove the H frame. My carpets probably look a bit frumpy, but are not very visible to other eyes. Also, since I am a yank, it is on the drivers side.

Berry

Thanks.I'll have a look at what I can do. Lifting the car to check the oil is no great chore at the moment but I'm not getting any younger.

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