Turbo oil drain to engine oil drain AN fitting size?

[Tippy]

First off, I DAFS!

After draining to the chain cover without a 100% success (leaks oil even after new fittings and line plus is right next to exhaust to turbo flange), I was wondering what fitting I need to adapt the -10 AN hose to the engine oil drain plug boss?

Engine is an '87 C3.2L (3.4L now) BTW.

I saw someone post M20 X 1.5 but I've had no luck sourcing such a fitting.

Where to get this and is this the size I am after for mine?

Second, I question all together if this is a better method. I would think the sump would maintain a certain level of fluid which would somewhat stop the gravity feed from the turbo into the sump.

What am I missing? TIA

[Tippy]

Here is the before with braided line hose clamped over an AN fitting (not my work!!!). Of course it leaked around the threads to hose sealing area. Plus, the gasket leaked on the turbo oil drain fitting. Second pic is Push Lok barbs with Push Lok hose (no clamps needed). This worked great for space since you do not need hose clamps but I tapped the oil drain adapter for the Push Lok barb and now it leaks where the barb is threaded into the adapter (pipe threads). I thought, what the hell, I like the idea of draining to the sump.

[turbobrat930]

Hmm, I have a few questions for ya... BUT, please dont take them the wrong way. I am here to help you, not to criticize.

ON the first pic. Whoever used a hose clamp on the SS braided line needs to be shot!!

Did you braze the AN fitting to the chain case, or just cut and tap the hole, and then thread in the fitting? Remember, if it is an AN fitting, they seal by the beveled tip, NOT the threads. If is is a NPT fitting, you will need most of the fittings threads to contact the material, as it is an interferance fit that seals them. No amount of teflon tape will seal either if these last two conditions are not met.

Post up a picture of the bottom of the turbo and how the oil line is attached to that.

I will go out and take a few pictures of how mine is plumbed. Mine has never leaked.... and probably never will

[proffighter]

BAT (British American transfer) carries a lot of metric fittings, worth a try, I am sure they got what you are looking for

[Tippy]

Originally Posted by turbobrat930

Hmm, I have a few questions for ya... BUT, please dont take them the wrong way. I am here to help you, not to criticize.

ON the first pic. Whoever used a hose clamp on the SS braided line needs to be shot!!

Did you braze the AN fitting to the chain case, or just cut and tap the hole, and then thread in the fitting? Remember, if it is an AN fitting, they seal by the beveled tip, NOT the threads. If is is a NPT fitting, you will need most of the fittings threads to contact the material, as it is an interferance fit that seals them. No amount of teflon tape will seal either if these last two conditions are not met.

Post up a picture of the bottom of the turbo and how the oil line is attached to that.

I will go out and take a few pictures of how mine is plumbed. Mine has never leaked.... and probably never will

Ok, where do I start?

First, the hose clamp over braided line was done before me as stated. It works but obviously wrong (first pic)! I put it back together like this so I could run my new rebuilt engine (I need to create my own "engine rebuild" thread BTW).

The chain housing cover is simply tapped with a pipe thread. 3/8" NPT IIRC.

Second, the turbo oil drain adapter is the standard 2-inch bolt flange with a ~3/4" elbow pipe coming off of it as one piece.

What I did was, was cut the elbow off, and tap (NPT) the adapter to fit the Push Lok fitting (second pic).

Due to an imperfect fit with tapping an elbow, it leaks. I used liquid pipe sealant and not actual teflon tape which will probably stop the leak.

But, I don't care about the feed to the chain housing in that configuration, I want to drain to the engine sump.

I still question how effective it is but I want to try it.

So, my question was is the dimensions correct and if it is, where do I get the fitting from?

[Tippy]

Originally Posted by proffighter

BAT (British American transfer) carries a lot of metric fittings, worth a try, I am sure they got what you are looking for

I'll look into, thanks.

[turbobrat930]

Although BAT is a good place to source parts, they are not the cheapest out there. They are good for very obscure parts...

If you do change your mind, and drain the turbo into the case drain plug, what are you going to do with the hole in the chain case? If the fitting that is in the chain case cover was the right fitting, and it was welded to the cover, then all you would have to do is put a cap on it. They are like $5 bucks, and it would look professional.

IMHO, since you already have the hole in the chain cover, I would stay with that. You would be under $30 to $40 bucks to do it right. Here are a few pics of my setup, whicjh has worked well for me for years...

[turbobrat930]

I know you said you have a 3.2L, which I am assuming you do not have the factory scavenge pump off the 1,2,3 cam. This is a dash 8 (-8) setup with the ss braided line and the AN fittings. The fitting that was welded to my chain cover was welded from the inside. The parts to do both lines to include ss braided line, and fittings was under $60 bucks. If you dont have the scavenge pump, you will only need one of the lines....

[Tippy]

Originally Posted by turbobrat930

If you do change your mind, and drain the turbo into the case drain plug, what are you going to do with the hole in the chain case?

Since it's NPT, I'd just put a pipe plug in it and call it a day.

Originally Posted by turbobrat930

I know you said you have a 3.2L, which I am assuming you do not have the factory scavenge pump off the 1,2,3 cam. This is a dash 8 (-8) setup with the ss braided line and the AN fittings. The fitting that was welded to my chain cover was welded from the inside.

Yeah, I want -10 (5/8") instead of the 1/2" I have now. -8 would put me right where I am now but I want more flow since it seems the be the norm to run -10.

Anyways, I wanted to try the sump but finding an M20 X 1.5 to -10AN seems impossible.

The person who created a write up showing their spreadsheet, I PM'd with no response back.

I want to know where to get a metric to AN fitting other than the place stated since you said they are pricey for the engine case oil drain boss?

[Tippy]

Originally Posted by proffighter

BAT (British American transfer) carries a lot of metric fittings, worth a try, I am sure they got what you are looking for

Sweet!

They have the M20 X 1.5 to -12AN!

So, I guess my question, is that what my drain plug is in my 3.2? According to Wayne's parts diagram, it is indeed M20 but I don't know about the 1.5?

Anyone?

Don't want to buy a fitting, have it shipped, and then be the wrong size.

Next post will have the fitting.

[Tippy]

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[Tippy]

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Is this the threads for a 3.2?

[cliyde]

Tippy,
See my post in regards to the turbo drain solution... you need the union alloy.

Turbocharged My 3.2L Carrera!

[Tippy]

Yeah, I understand it requires a union, I was just making sure the 3.2 uses an M20 X 1.5.