oohhh, Im getting so close to finishing my turbo project!

i've got some questions on a GSL-SE front cover that I have.

the oil cooler return/feed whatever it is on the drivers side of the cover, what is the thread on there.

I ordered adapter fittings from mazdatrix, but neither of their sizes work. ???? I need to get a 10an adapter for this.

I also need to install a 10an adapter for the turbo drain in the Boss thats on the passenger side.

the hole is 3/4 in diameter so can I just tap it for 3/4???

otherwise, I have a 10an bulkhead fitting I was thinking could work. I would just need to drill it out some, but Im worried it will hit the oil pump chain.


and lastly, there was a thread recently about a oil pressure problem and how it might be related to a Oring in the front cover. I dont remember a o ring when I swaped covers on my S5 motor, so I need to know where to check for it.

Setzep, Mike, robert, Im looking in your direction...

thanks

 

The hole in the front cover is 16mm. The Mazdatrix metric to AN adapters fit perfect. Mebbe you got an 18mm? The one on the rear housing is an 18mm.

So you want to install the turbo drain fitting on the cover there. Hmmmm. You could tap it for pipe threads (3/4) and use a 3/4 pipe to AN-10 adapter. With the bulkhead fitting, id be worried about leakage. They arent designed (grooved) to accept an O-ring. Neither is a standard jamnut. Other option is to fit the AN-10 fitting in the hole, cut off anything sticking out inside and have the fitting welded on.

 

Drill and tap for 1/2 pipe. If I remember right it was a 3/4" drill bit that I had to use for the hole. You can get a 1/2" pipe tap at any hardware store.

The o-ring on the front cover is where the oil goes from the front plate to the front cover. You need a o-ring in there to seal it. You should have a black rubber o-ring and a white (if I remember right) teflon backup ring that goes around the o-ring.

 

does it usually fall out when you take the cover off.

on the turbo drain. 1/2 or 3/4 tap??? kind of lost you there. I would like to just tap it if I can find a 3/4 tap, dont think ive seen one that big.

on the cooler line... they sent me 4 fittings, 3 18s, one for the rear housing and, two for the fc cooler, and one 16mm for the front cover. the 16 one threads in a little and then tightens up, like the treads are wrong or something.

 

Yea, I cant recall what the drill size is. He may be right, a 3/4" hole for a 1/2npt fitting. So then you need a 1/2npt-AN-10 fitting.

Theres a backup ring there? Ive never seen one. The o ring goes in the groove in the front housing. Look at the cover gasket. Notice one hole is alot bigger than the other bolt holes?

Then your threads in the cover may be dicked up. Do you have a stock fitting to screw in to check the threads?

EDIT: 1/2-14 NPT 45/64" = .7031" drill

 

KD Rotary did ours, and it drains in the front cover pretty much right above the oil metering "pump". I really wish we brought the car back and did it ourselves, cause they charged wayy too much to have it done. Basically, drop the oil pan, drill a hole, use a pipe tap and install a brass bung. No need to take off the front cover, that way you'll know if it's near anything when your underneath the car looking up (with the pan of obviously). If you got any other q's on your turbo project, feel free to PM me. We ran into just about EVERY problem there could possibly be when it came to turbocharging our 79 widebody.

 

By the way, the drain line from the turbo has to travel downward. This is the only reason I don't suggest connecting it to where the oil cooler runs to on the other side of the housing. The "slope" of the return line must continually run downward, with no ups and downs whatsoever. That will cause backup, believe it or not. That was our problem and the car smoked like a bitch cause the oil was shooting out the turbo's bearing and into the exhaust turbine. The car was not allowed on the dyno that way, so we left the car there for them to fix the return line problem.

 

They did a great job by the way!

 

well I want to pull the front cover anyways to make sure I have that o ring. and I would much rather have the return on the cover than on the pan. seams like it would look like a kit and not a custom job.

 

Sorry to bring up this old thread but which o ring are we talking about here?

 

Drill the Pan, Screw in the Fitting with Pipe Tape wrapped around it.

Problem Solved.

 

dont worry about it, ..... doesn't exist. well, atleast not with the amount of fat traveling thru my toes. usually it takes about an hour of work. not a bad price though, if you ask him.

 

Hey I just took two photos of my Oil Return line, You can check it out @ www.mumpy.net

Last two photos in the Before and After Link.

Hope this helps some.

RLTW!

 

here is a website with info to tap for the turbo oil drain

http://home.mn.rr.com/linnihan/turbo_oil_return.htm

carl.

 

Thanks for those pics. I'm going to do the drain into the front cover though (gslse cover). Very clean car! You got a great deal on it.




I was checking out that site earlier but went to Home Depot, Lowes, and Sears and nobody has heard of that size drill bit/

 

Get a reamer bit. That should work.

 

drilling the SE front cover...

23/32 Drill Bit
1/2 - 14 NPT Tap

 

Nice...

 

perfect!!! great pics

 

Yes, thanks for the pics and info on the sizes. That other website was saying to use a 45/64 bit???

now I know use a 23/32 and tap for a 1/2 - 14 npt

It all makes sense now, thank you