Cock up

[boxintwins]

Hi all today I made a big cock up.I decided to replace the fuel filter on my 1150gs unfortunately I snapped one of the M5 studs holding the assembly in the tank. Am I the first person to do this?(please tell me I'm not),and what if anything can I do now to repair it.Any advice woud be very greatly appreciated.

 

[Canuck]

drain and wash out tank then weld stud back on. simples.... if you weld or have a mate who does.

 

[(RIP) DitchWater]

You're not the first but I may have read somewhere that you can get away with losing one.

I don't know how true this is because I've never experienced this.

It should be possible to have a replacement stud braised onto your tank but you'll have to clean the tank out to remove the fuel gases.

 

[davegs]

Tank

Don't worry about it very common put it back make sure the O ring fits ok and you'll be fine. Do a search this happens lots of times, use copper slip on studs when replacing it.

 

[Steptoe]

You should be ok with 5 studs.

But one thing not to do is overtighten the other nuts to compensate.

 

[littleredrooster]

It should be possible to have a replacement stud braised onto your tank ...

Only if it's beefy enough...




























You were probably thinking about 'brazing'

 

[boxintwins]

I tried bolting it back with the remaining bolts and it didn't leak but I don't know how well it would hold with a full tank of fuel! I have the tank drained now but what is the best thing to wash the last of the petrol out with? before anybody goes near it with any welding equipment!

 

[Fanum]

A squidge of silicone sealant.gasket splurge around the seal probably won't do any harm either

 

[bowser]

I tried bolting it back with the remaining bolts and it didn't leak but I don't know how well it would hold with a full tank of fuel! I have the tank drained now but what is the best thing to wash the last of the petrol out with? before anybody goes near it with any welding equipment!

dont bother, wash it out then block the holes off and fill it with water, other way I have done it in the past was to put some dry ice in the tank and fill it with carbon dioxide vapour
You may even find it easier to drill a hole where the stud needs to be, put a bolt through from inside the tank and then either braze the bolt in place or you might getaway with silver solder, all it has to do is make the gap round the bolt petrol tight and stop the bolt turning whilst you tighten it up, much easier and stronger than trying to braze a little bit of thread on to the tank.
Another option is to use a petrol proof epoxy, put that on the inside of the tank where you have drilled the hole, put the bolt through and seat it into the expoxy, that will seal the hole and no heat required.

 

[boxintwins]

Thanks guys! Some good suggestions there I think I'll go with the bolt straight through and solder to seal it and a dash of sealant on the plate as well

 

[Canuck]

Let us know if the solder stands up to the vibrations... I'm genuinely interested as I didn't think there was much give in it.

 

[boxintwins]

no problems

 

[boxintwins]

Hi All to let you know I had a change of plan on getting the tank done I got it Tig welded. I think it is better to be safe than sorry,a pal told me that he didn't think that the solder would be a success and would probably fail.
Thank you for all your help and suggestions though.Keep up the good work

 

[pce13]

I done the same snapped one of the threaded parts off,
i just made sure the seal was correctly fitted and made do with just five nuts,
no leak at all even with full tank.

 

[davegs]

Solder

That will be fine that's how they used to make petrol tanks in the good old days