Rear engine mount: gearbox thread stripped

I guess now I know why the mounting bolt fell out.

Anything to do apart from a new gearbox case?

You need to give us more information: year, model, engine, gearbox (auto or manual)...

Helicoil... http://www.helicoil.in/helicoil.htm or you can just get the next bigger size bolt and redrill and tap it. Maybe it's not the perfect thing, but sure cheaper than a gearbox!

owr084 said:

You need to give us more information: year, model, engine, gearbox (auto or manual)...

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Sorry. '01 Bora/Jetta, six-speed manual, AJM engine.

Franko6 said:

Helicoil... http://www.helicoil.in/helicoil.htm or you can just get the next bigger size bolt and redrill and tap it. Maybe it's not the perfect thing, but sure cheaper than a gearbox!

Click to expand...

Thanks for that. Can't seem to find a distributor in Ireland, but there are other similar products I can find - V-Coil is one.

They talk about M sizes. I'm not sure what that means and, therefore, which kit I'd need. Here's the label on the box that the bolt came in. Is it possible to tell from that?



Thanks again.

Right. Hopefully I've worked this out.

The shank width is 10mm (although the width at the screw is about 9.5mm). I guess that makes it an M10. The pitch I've measured at 1.5mm. The screw part is about 25mm. The length of the bolt (not including the head) is about 70mm.

I found this. Will it do the job, do you experts think? I'd like to just get an M10 kit but I can't find one in stock on-line, although a universal kit might come in handy later.

I'm reading that I need cutting fluid as well.

Does that sound right? I'd hate to screw up the screwing, as it were. Please, oh gods of all mechanical, give me a sign!

Bump. Let's help him out...

Actually they have a kit with only the size you need.

But if you want to drop the Ha'penny on a big kit like you linked, get the one that goes from 5MM to 12MM.

That will work fine and you will end up with a stronger connection with the original bolts with the original torque.

In an emergency, going to the next bigger bolt will work though.

Before throwing money on a kit, ty a local motorcycle repair shop, most will stock a range of helicoils for sparkplug thread repair.

whitedog said:

Actually they have a kit with only the size you need.

But if you want to drop the Ha'penny on a big kit like you linked, get the one that goes from 5MM to 12MM.

That will work fine and you will end up with a stronger connection with the original bolts with the original torque.

In an emergency, going to the next bigger bolt will work though.

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I ordered the multi-size one since it's delivered locally.

Thanks for the vote of confidence! I must admit to a fair amount of trepidation; if I make a mistake things could go from bad to worse. Anything particular I should be looking to do/not to do?

DPM said:

Before throwing money on a kit, ty a local motorcycle repair shop, most will stock a range of helicoils for sparkplug thread repair.

Click to expand...

Too late!

A nice fella in a motorsport shop did ring round a few of his mates in the business for me yesterday, and quite a few of them did have spark-plug sized kits but not the smaller type I need.

Sorry to keep banging on about a very boring subject.

I received the repair kit. The question I have is: the inserts are only about 1cm long whereas the bolt thread is more like 2.5cm, so should I use two inserts? Do I need longer inserts after all?

How much bolt engagement will there be? It better be more than the 1cm, so use two or even three and cut the extra off of the last one.You want to get as much bolt in the repair coils as possible.

You should be able to get longer inserts as well. 10mm long for a 10mm bolt is a sign that they cheaped out on that part and want you to use twice as many repair coils.

whitedog said:

How much bolt engagement will there be? It better be more than the 1cm, so use two or even three and cut the extra off of the last one.You want to get as much bolt in the repair coils as possible.

You should be able to get longer inserts as well. 10mm long for a 10mm bolt is a sign that they cheaped out on that part and want you to use twice as many repair coils.

Click to expand...

Thanks whitedog - I appreciate it.