Transmission gearbox leaking...

Finally found the culprit that causes a stiff gear linkage after a hot run.

The forkin’ transmission is leaking. Changed the tranny oil two years ago and I think there ain’t much left. Nice old and enlarging spot on the gravel under the tranny. I never noticed before.

Attachment 1517

So I’m gunna put new Redline MT-90 and this stuff, into the tranny and wait and see.

This Wynn’s product (I purchased two), is unavailable in Oz (I can’t find any), so this is from Europe.
http://www.ebay.com.au/itm/like/3319...pid=107&chn=ps


I’m also going to apply a line of metal paste to the bottom join.


Wish me luck. I’ll post later.

I wish you luck!

I'd be doing the job properly if it were me. When i say 'properly', i mean remove the gearbox, disassemble and reseal the casing.

External patches and stop leak (thickening additives) are bandaids and with a car that is in such nice original condition it would be almost sacrilege to just whack some bog on the outside of the box and put some sawdust inside.

I doubt it's coming from the join. My money is on of the seals: driveshaft, inputshaft, selector rod.

Penrite 85w-140 if you want to gamble with a thicker oil - I rate it :)

Quote:

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Originally Posted by Paullus

I doubt it's coming from the join. My money is on of the seals: driveshaft, inputshaft, selector rod.

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It does happen, but those other are definitely more likely.

It is the join. Confirmed.

As I do only 2,000 klicks a year now, (with 135,000 on the odo after 25 years) not sure if I wanna spend to professionally fix it at this time, even though I like it purrrfect. Will check leakage after fix.

I'll give this a go and advise.

bty: The Red Jett will be for sale in 2022. That is after 30 years of a one owner's seductive affair with it.

Hang in there.

Phil.

Quote:

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Originally Posted by Cozzm0

I'd be doing the job properly if it were me. When i say 'properly', i mean remove the gearbox, disassemble and reseal the casing.

External patches and stop leak (thickening additives) are bandaids and with a car that is in such nice original condition it would be almost sacrilege to just whack some bog on the outside of the box and put some sawdust inside.

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Oh what have you done to me Cozzm0?

OK, you put me to shame. The leak has got worse over the last four years. Huh, I already knew about it.

OK, who ever get's the Red Jett in five years better remember this.

I'll get a quote from a reputable garage, most likely go Von Bibra Nissan Gold Coast. Lots of experience.

Thanks Pal, you prolly cost me $600.00 bucks! :eek:

Phil.

K'mon Phil, i thought you were a DIY guy ?! You can pop the case off with the box still in the car, but it makes the whole job a lot harder.

Ah-hem… I was a DIY guy. Now gettin' long in the tooth and sick of skinned knuckles and bruised arms. I wish I had a hoist. That would be lotto for me.

No, I'm gently rockin' the Jett towards its 30th birthday and then seeing who wants to look after it.

I am perplexed that there are no PURPOSE manual gearbox stop leaks in Oz.
I gave the Wynn's option a miss… Postage - was 40 quid from Europe.
So looking at this one. Check it out:
http://store.gobdp.com/transmission-sealer-00236/

Note that after the words, Blue Devil, are 'do it yourself'… Ah, all my life is just a circle…
The reviews, on Amazon, were all avg. 4 stars.

Looks the goods…


Phil.

Well, tranny oil changed today. As this leak has been, I think, causing my linkage to tighten after a hot uphill run.

However, I got about three litres out and in good colour. Minute filings around the sump plug magnet. Nought to worry about there.

Replaced 3.6 litres of Redline MT-90, along with 120 mill of BlueDevil transmission sealer.
http://store.gobdp.com/transmission-sealer-00236/

Took the Red Jett for a hot run to Canungra (Gold Coast Hinterland) and back. All is well.

However, I think the linkage stiffening, might be because I removed the heat shield, which would sit below the shifter and cook it up.
Wrapped that piece of pipe (was once where a feline roamed), with header wrap. :p

Let's see now...

Removed heat shields for weight reduction? or because you can ?

It was a weight reduction thing I did. Spoke to Colin Chapman about it...:rolleyes:

OK, verdict is now in. The BlueDevil product has fixed the tranny leak. No more there.

This stuff was like water and clear. I can recommend it. Can only be sourced from the US.
http://store.gobdp.com/transmission-sealer-00236/

One happy camper...:)

Quote:

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Originally Posted by Cozzm0

I'd be doing the job properly if it were me. When i say 'properly', i mean remove the gearbox, disassemble and reseal the casing.

External patches and stop leak (thickening additives) are bandaids and with a car that is in such nice original condition it would be almost sacrilege to just whack some bog on the outside of the box and put some sawdust inside.

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Oh Cozzm0, After four years, it is still leaking. Bugga!

So, as I'm doing a full restore, it's off the Black Magic to get repaired. The prop.of Black Magic had a SSS N14 once and fitted a SR20DET to it. So he's the one.

https://blacklabelautomotive.com.au

Any advice. Do I need gasket?

Cheers.

Its all liquid gasket between the two halves, there is an o-ring under the end cap cover, but pretty much just reuse the o-ring and goo the crap out of it and you'll be fine.

Quote:

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Originally Posted by Cozzm0

Its all liquid gasket between the two halves, there is an o-ring under the end cap cover, but pretty much just reuse the o-ring and goo the crap out of it and you'll be fine.

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Thanks very much. I might as well replace all appropriate seals as well.

Cozz, would you please advise what seals are required.

Cheers, Phil.