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· Pronounced Tek-DAY-us
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1,695 Posts
Discussion Starter · #1 ·
My turbo is a custom billet GT35r that has the water lines excessively close to the T4 turbine housing. The banjo bolt in the pic below I had to have cut shorter, machined in a lathe, and have an allen bolt head welded on. This was the only way to install this bolt and tighten it on the turbo.

The problem is that it keeps coming loose, even after only 1 or 2 drives, it ends up loose and leaking coolant. I've tightened it so hard that now the allen bolt head has stripped. I think I will have to cut this allen head off, and source a hardened steel one to weld back on.

Just thought I'd ask you guys about the best solution for this. Is there a special hardened allen bolt head that is much longer/deeper? So that I can get more of the allen wrench in so it does not strip again?

Is there some locking part I can use? Tack weld it somehow?

Regarding threadlocker, is it advisable to use in such a hot area? I would like to be able to remove this bolt if I need to in the future, but I need to have it stay put as well.



All the fittings are just too tight like this:

 

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8,453 Posts
I would say for you to take the turbo off, disassemble it, put the line on, reassemble it, put it back together. For the thread locker, idk if it is okay for coolant/water. I wouldn't use it, I think it's oil based.
 

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735 Posts
thread lock probably won't work, its on a lot of the bolts on the audi's i work on and we use heat to soften up the locktite so it can be removed easily... um but i will tell you that when i replace turbo's on any car weather it be a 1.8t or 2.7t i always tighten up the banjo bolts then use a drift and smack it with a hammer, not excessively just a good tap or 2 then tighten again. i always do this to make sure the crush washer won't leak, but it might just help in your case who knows.
 
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