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Gear issue in transmission

Posted by hhj1397

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Gear issue in transmission #1
hhj1397 Hans Jensen Philly, PA, USA 1969 MG MGC	Posted: March 10, 2012 10:04AM Registered: 2 years ago Posts: 225

So...I opened up the access plate on the transmission to take a look. Unfortunately, though everything seemed ok, I noticed a tooth missing from what I believe is third gear. Now, excuse my lack of knowledge here, but it seems like it is the taller, thin gear, not the non synched drive gear. Is this perilous? Or something that can be ignored for now. A transmission rebuild is a bit cost prohibitive a the moment unless dire...

Thoughts?

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Re: Gear issue in transmission #2
mgcgt2912 Richard Bailey Cully, East Devon England, United Kingdom 1969 MG MGC GT	Posted: March 10, 2012 12:43PM Registered: 2 years ago Posts: 677

Gearboxes, I know very little about. Except when they go wrong.. then I ask someone else to fix it or buy a new one.
Having got as far as having the engine and gearbox out of the car, I don't think I could even consider putting it back in with a known problem in the g/box. It has to be false economy.
Unless of course you love the idea of lifting out that great lump again sometime soon !
Just my two pence worth.
R

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Re: Gear issue in transmission #3
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: March 10, 2012 03:20PM Registered: 4 years ago Posts: 13,090

A pic of the problem would curry more informed advice. IMHO if 2/3 remains and more importantly the missing bit is salvaged/scavenged/removed, an "aware" owner/driver would understand the inferred next foot fall and be somewhat cautious in 3rd gear. OTOH, I do not dispute Richards better advice budget consideration not with standing, his is the more proper avenue to follow.

So we now believe not only was the PO a bit ham fisted, he likewise was challenged with his foot hand co ordination...
I hope it is not so, but it almost appears this is the tip of an iceberg. GOOD LUCK! smileys with beer

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Re: Gear issue in transmission #4
hhj1397 Hans Jensen Philly, PA, USA 1969 MG MGC	Posted: March 10, 2012 05:55PM Registered: 2 years ago Posts: 225

Watching Jon Twist's video of the details on how the gearbox works, I can clarify a bit. Its a single tooth on the engagement teeth. Its totally sheared off. With the synchro system, I would think since it works on a spline capacity, it would have little effect?? I'm not even sure how that could happen unless it was a defect from the beginning. I looked all around and didn't see any remnants so I am guessing it was an old injury.

I will try to crack it back open to get a picture

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Re: Gear issue in transmission #5
bowtech Stan Bowles North Vancouver, Canada 1968 MG MGB GT 1968 MG MGC GT 1968 MG MGC GTS 1969 MG MGC GT 2000 BMW 323i → more	Posted: March 11, 2012 10:18AM Registered: 1 year ago Posts: 323

I wonder where the piece has gone? eye popping smiley

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Re: Gear issue in transmission #6
hhj1397 Hans Jensen Philly, PA, USA 1969 MG MGC	Posted: March 11, 2012 10:30AM Registered: 2 years ago Posts: 225

I'm sure it dropped to the bottom and drained out with transmission oil changes over the years...I looked all over and saw nothing.

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Re: Gear issue in transmission #7
Swamperca Swamper CA Nor Cal, USA 1969 MG MGB GT "Rat" 1969 MG MGC GT "A 69 MGC" 1970 MG MGB GT "Widow" 1971 MG MGB "Ruby" 1974 MG MGB "Groovy B"	Posted: March 11, 2012 11:08PM Registered: 8 years ago Posts: 7,658

It could get into the OD.

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Re: Gear issue in transmission #8
hhj1397 Hans Jensen Philly, PA, USA 1969 MG MGC	Posted: March 12, 2012 06:10AM Registered: 2 years ago Posts: 225

Heres what I am looking at. Note: yes that was ATF in there I believe...will be replaced with 20W50.

Thanks for the advice all!

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Gear1.jpg (43 KB) –

Gear2.jpg (30.6 KB) –

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Re: Gear issue in transmission #9
bowtech Stan Bowles North Vancouver, Canada 1968 MG MGB GT 1968 MG MGC GT 1968 MG MGC GTS 1969 MG MGC GT 2000 BMW 323i → more	Posted: March 12, 2012 08:14AM Registered: 1 year ago Posts: 323

Fairy took it?!!! eye rolling smiley

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Re: Gear issue in transmission #10
romeo69 stephen curtis berkshire, United Kingdom	Posted: March 12, 2012 04:46PM Registered: 2 years ago Posts: 391

is the car a driver have you changed gears at high speed and revs..

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Re: Gear issue in transmission #11
hhj1397 Hans Jensen Philly, PA, USA 1969 MG MGC	Posted: March 12, 2012 05:07PM Registered: 2 years ago Posts: 225

It was sitting for a while. I had it up on stands, engine running and shifted though gears with no issue but with no real load.

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Re: Gear issue in transmission #12
romeo69 stephen curtis berkshire, United Kingdom	Posted: March 13, 2012 05:05AM Registered: 2 years ago Posts: 391

just double declutch on change down and up ,if you are not going to remove it

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Re: Gear issue in transmission #13
romeo69 stephen curtis berkshire, United Kingdom	Posted: March 13, 2012 02:10PM Registered: 2 years ago Posts: 391

you will also probealy find it jumps out of gear i also meant to add

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Re: Gear issue in transmission #14
hhj1397 Hans Jensen Philly, PA, USA 1969 MG MGC	Posted: March 13, 2012 02:47PM Registered: 2 years ago Posts: 225

Thanks for all the help...I may throw it back in and see if there are issues. The engineer in me has a hard time seeing how in a spline connection a single missing tooth out of 30 or so would drastically stress the gear or fail to transmit torque. Good advice with caution and a careful search for the remnants. My guess is this was an old injury that the PO never detected.

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Re: Gear issue in transmission #15
romeo69 stephen curtis berkshire, United Kingdom	Posted: March 13, 2012 04:58PM Registered: 2 years ago Posts: 391

you have the best gear set fitted i noticed ..

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