Ol return tube

[Vertigo107]

Hey Guys,

I'm upgrading to a larger turbo, and I had to use larger bolts for the return tube at the bottom of the new turbo. The holes that are on the return line flange are too small for the new bolts to fit through. Is there a double sized treaded stud available to make this work without having to enlarge the holes on the stock return tube? In other words, stock size on one end, and 3/8 on the other?

Thanks,
CJ

 

[salvageV6]

You sure it's 3/8" and not 10mm?

I found 8mm x 10mm x 1.38"L ones but there's no number on them or packaging.

They were in the slide out drawers at one of the hardware stores, ACE, Sears Hardware, I don't think it was Home Depot but they have a few drawers there with hadware also.

I found them about a year after I drilled out my flange for the larger studs which I thought were 10mm on my Innovative turbo.

I don't think McMaster Carr has them either.

Not much help I know but I'm sure they do exist. :smile:

Hopefully you can get some better replies.

 

[86 TR]

Hey Guys,

I'm upgrading to a larger turbo, and I had to use larger bolts for the return tube at the bottom of the new turbo. The holes that are on the return line flange are too small for the new bolts to fit through. Is there a double sized treaded stud available to make this work without having to enlarge the holes on the stock return tube? In other words, stock size on one end, and 3/8 on the other?

Thanks,
CJ

I had the same problem when I installed my 6262 turbo. I drilled the holes bigger in the drain tube to make it work. Kind of a PITA.

 

[Vertigo107]

Thanks, ill search tomorrow. I hope I don't have to drill out the holes, that would really be a PITA!

 

[BlackMetal]

Yeah this caught me off guard during my first turbo upgrade from stock turbo too. Didn't know the bolts would be bigger. Drilling out the holes is a piece of cake though.

 

[salvageV6]

Here's the 8mm x 10mm ones I found, I believe the stockers are 8mm bolts.

Double check the new turbo for sure to get the right size.

I think they were from Sears Hardware, they may have non-metric as well but I wouldn't drive too far to find out.

 

[BlackMetal]

Wow I wouldn't have expected something like that to even exist lol.

 

[Vertigo107]

Awesome, thanks for the photo!

 

[XLR8]

The holes on my 6262 were also 3/8 - sort of surprised me. I did not see any dual size studs so used 3/8 studs and had to drill out the holes to the drainback flange. If you find some dual sized studs let us know as I would use them next time.

 

[salvageV6]

Not cheap but someone makes them. :biggrin:

ARP #070-100-1401

Universal Stud Kit
Hex 3/8-5/16''
16/pkg

More Details
$111.99

Not sure if the 5/16" size will fit through the stock hole or if they will fit your turbo or what the overall length is but they are out there if you want to pay about $100 for 16 of them.

Sell the others as a kit.

 

[salvageV6]

Oh yeah thread pitch is important too double check everything before attempting to buy them.

Drilling sometimes is the easy way out.

 

[Vertigo107]

Yeah, looks like I will be drilling out the holes, as finding the studs at a reasonable price around here is not looking good :-(

 

[Vertigo107]

Of course, getting this tube off is going to be another story in itself!

 

[salvageV6]

I've got the aftermarket braided tubes on both cars, the flange unscrews from the tube which can stay in the car. Makes it easier.

It's easier that way you may want to buy one and modify it before the installation.

I'd consider a stepped unibit, portable drill or air drill, and if there's enough room in there do it on the car if you can hold the flange some way, small vice wedged in there somehow etc.

Use tape over the hole too.

If you know a machinist they could turn down some 3/8" threaded rod on a lathe and then retap threads of 5/16" or 1/4" in it and make the studs.

 

[Vertigo107]

Thanks for all the help guys, I actually ended up using my dremel and one of the cutting bits they have for it. Took all of 10 minutes I guess. I haven't driven the car yet, but I'm looking forward to it!