Jumps out of 1st gear on take off.

[soggz]

Hi all. ‘72 1600.tp.
As title. Pull away and build the revs, then jumps out of gear. New clutch, cable adjustment right.
Educated guess… would this be anything to do with the plate under the gearstick loose/not adjusted correctly? If so, is it a case of loosening the two bolts, putting it into 1st gear, then re tighten?
Thanks.

[Abscate]

FIrst check, motor mounts. Make sure something isnt broken and your engine isnt getting ready to fall out. First sympton, pullnig it out of gear.

Next symptom , lots of loud noises.
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[soggz]

[halfassleatherworks]

check the shift tube coupler at the front of the trans.

[SGKent]

the indents in the selector hold the shift rail in position. If you can fully engage first gear and it pops out, it is a more serious problem. The shift linkage is designed to shift the different shift rails, not hold it in gear. If you can put it in first gear and not hit the E-brake or ashtray, the problem is in the transmission. That is my opinion. Once the main bearing wears into the nose cone, the gear does not fully engage and that can wear it funny and cause it to pop out. Sometimes it can be saved with the plate from Weddle.

You can see the three shift rails on the right. The shift linkage moves those and they in turn move the gears, and lock in place with ball bearings and pins that lock into indents. The three are made so only one can be engaged at any time, and when all three are lined up it is in neutral. So if you can push it all the way into first gear, the shift rail should be locking the gear in place. As the big center bearing wears into the nosecone, the whole mainshaft and gears change tolerances, and bad things happen. Weddle makes a steel plate that pushed the main gear back into place. It is a work around kind of fix but it may help. To use it the nosecone has to be milled the thickness of the plate.

These are 091 photos but 002 is almost the same.

first gear

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[soggz]

[SGKent]

well the issue is that if you push it forward into first gear, and the gear knob stops moving before hitting something, then in my opinion it is going into first gear, and the selector and gears should hold it locked there. Sloppy shifts, having trouble finding a gear would be a stop plate or linkage issue. But you are finding first gear - it just isn't staying in it. You are in the UK, is this correct? Maybe MikedJames may know someone who can assist you. He is in Hampshire.

https://www.thesamba.com/vw/forum/profile.php?mode=viewprofile&u=298861
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"Most people don't know what they're doing, and a lot of them are really good at it." - George Carlin

[soggz]

[SGKent]

[SGKent]

as Abscate said, do check your motor mounts and the transmission mount. There are also a set of mounts above the bell housing that break with time. If the engine is torqueing or moving, it could be pulling it out of gear just like you are shifting it.
_________________
"Most people don't know what they're doing, and a lot of them are really good at it." - George Carlin

[aeromech]

Have you drained the gear oil?
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[soggz]

[SGKent]

was it jumping out of gear before you replaced the nose cone seal, and did you take the nose cone off and do anything inside it?
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"Most people don't know what they're doing, and a lot of them are really good at it." - George Carlin

[soggz]

Yes,mit was jumping out of first before I took the nose come off.

[SGKent]

[soggz]

Thanks.
That looks complicated, but seeing it, makes me understand the internal workings. When I had the nose cone section off, I saw no wear or witness marks of anything that could have been out of place or worn. There was no play in the large bearings next to the selectors, so I’m guessing that everything is as it should be. I’m going to get under the bus again later today to see if anything is ‘off’, or not how it should be. I know that the first connection from the bottom of the gear lever where the first wired square topped bolt is, is pretty much rusted in and doesn’t move. The rear shaft coupling was new a few years ago, and the wired bolt is present, so no movement there. All the engine mount runners and gear box to chassis mounts seem fine, as I examined them all on putting the engine and gearbox back in about a month ago. So from the lever to the box, everything looks as it should…

[Abscate]

[Nitramrebrab72]

To narrow down the cause of the problem I would disconnect the gear selector linkage at the gear box and manually select 1st using the lever coming out of the gearbox case and drive as before .. If it still jumps out then it's a gear box problem , if it stays in then it's a gear linkage problem.

[Abscate]

[SGKent]

it is a good idea.

That said, to the OP, unless you knew what to look for, it would not have been obvious. Read these quotes below from a recent thread. There are many more like it but this is a recent one. In his photo like this, you can see where the main bearing has eaten its way forward. It should be flush. By all means check the coupler and grub screws etc., but I think in the end you will find this as a possible problem. It may have already worn out the slider hub and the gear so it no longer locks the gear in place. Here is a good explanation. Rick Long retired so his website is no longer available but there is a copy of a technical page on archive.org. Be patient for it to load. https://web.archive.org/web/20180128224141/http://www.longenterprises.com/remachined_sliders.htm