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-AN threaded Turbo oil drain hose? - Printable Version

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+--- Thread: -AN threaded Turbo oil drain hose? (/showthread.php?tid=6233)

-AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-12-2015

Does anyone ever thread the oil drain hole in the block for a NPT-AN fitting, and run a stainless hose, for a turbo oil drain?

I'm interested in doing so....any advice on what diameter I can enlarge the hole to?

RE: -AN threaded Turbo oil drain hose? - zeeman - 02-13-2015

(02-12-2015, 10:11 PM)Mylesofsmyles Does anyone ever thread the oil drain hole in the block for a NPT-AN fitting, and run a stainless hose, for a turbo oil drain?

I'm interested in doing so....any advice on what diameter I can enlarge the hole to?

I assume your talking about the oil drain back from the turbo to the oil pan. I don't think there is enough meat in the turbo housing to run a A/N fitting and hose that size. It would probably be a 10 or 12 A/N to have the I.D. the size of the stock metal tube, and you wouldn't want to go any smaller.

RE: -AN threaded Turbo oil drain hose? - raysorenson - 02-13-2015

A 3/4" pipe thread tap might work for the oil pan/lower block. Measure the diameter of the hole before selecting tap size, of course. Then it's just a matter of using an AN adapter.

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-13-2015

I've got the bit and tap...common procedure on Volvo Turbo Redblocks.

As for mounting it to the turbo...same kinda deal. There are tons of oil drain to AN 10 adapters. I'm asking, as I simply haven't seen it done on a om617. Oil feed seems no trouble.

I'm trying to get away from the MBZ o-ring style of sealing. It also makes use of different turbos easier.

I'm interested in using a TD04 series turbo from a Volvo 940...though I'm curious, for better or worse, how the om617 will respond to a TD04HL 15g or larger. Maybe a smaller 13c would best, and enjoy the faster spool and lower end torque.

Anyone ever do water cooling for their journal bearings in these cars?

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-13-2015

Looks like there are smaller size NPT to 10AN adapters...so if it's got to get tapped to 3/8" or 5/8", I can do so.

Really leaning towards a 13c, setup with water cooling, just plumb non-intercooler pipe/fittings, cone filter & oil catch can. Eventual goal being water/air intercooler & 3" exhaust

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-19-2015

I've got the bottom leg of the oil drain tube removed....oil pan off.

WOW, that hole is HUGE....and a funky step/taper in there.

I think I'd have to drill it to 1.5" and tap for 1-1/4npt.

RE: -AN threaded Turbo oil drain hose? - wolverine - 02-19-2015

(02-19-2015, 08:51 PM)Mylesofsmyles WOW, that hole is HUGE

Thats what he said!!   HA!!!!

But in all seriousness, yes it is.  I didnt have a -10 weld bung with a big enough base so I cut the -12 end off an adaptor and welded the -10 with the hex part onto the oil pan.  Motor was apart so it was pretty easy.

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-19-2015

I want to make use of the hole already there, otherwise I'll have to plug it somehow..

The hole Benz gives is nice.... it works in gravity's favor too.

I'm working with a machinist/fabricator to make an adapter that'll press into the stock Oil Drain hole, in the block of your OM617a, and adapt to a -10AN fitting.

This would be a real problem solver for those installing different turbos, modifying manifolds, and in need of a custom oil drain line.  It'd also be a nice upgrade from the stock rubber o-ring fittings.

It'd be something kind of like this....this one is for a Volvo Redblock..

[Image: Oil_return_fitting%20_b230.jpg]


Am I the only one who would want something like this, or is there any other interest?

RE: -AN threaded Turbo oil drain hose? - raysorenson - 02-19-2015

So a 3/4" NPT tap doesn't have a chance huh? That's pretty big tap. Do you know the diameter of the hole?

I might be interested. Pipe thread taps seem to get exponentially more expensive past a certain size.

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-19-2015

It'd have to be a 1-1/4NPT thread....drill out to 1-1/2"....barely enough room to do so.

The stock hole is kinda funny with weird lips and tapers....difficult thing to tap.

I thought about tapping to the 1-1/4NPT and using a reducer to 3/4NPT, and proceed with a 10AN adapter, but that gets kinda messy, and I'm not confident in enlarging that hole to 1-1/2"

Josh @ Yoshifab can produce something that'll seal tight there...maybe anchored similarly to the AC line, with longer oil pan bolt and a nut, to secure it in place. It'd be a simple installation, to get a 10AN fitting there.

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-23-2015

Just bumping this with an update.

Josh at Yoshifab has worked up a drawing, and a prototype is in the works.

Pricing is very fair and will include a brush for prep, assembly compound, the custom fitting and a 10AN cap.

I'll keep y'all updated as we get closer to production. Once I have something to show, I'll post an official Group-Buy thread.

I'm excited, how about you?

RE: -AN threaded Turbo oil drain hose? - Captain America - 02-23-2015

Fuck yes! I have mean meaning to do this myself but since you've got it sorted I'm in! Why not -12 return line?

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-24-2015

12an is just overkill. You can run a plenty large hose with a 10an...I just don't see the benefit to going larger.

RE: -AN threaded Turbo oil drain hose? - Captain America - 02-24-2015

Well -10 is 5/8 .625" What is the stock size? Gotta be at least that?

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-24-2015

I have a micrometer and stock drain tube at home. I'll measure and report back. No doubt though, 10AN is plenty big. It's not a high pressure or volume hose...just a simple gravity feed. A lot of turbos have an oil restrictive before or at the feed, so again, it's not a high volume application.

Just curious why you'd want to bigger?

RE: -AN threaded Turbo oil drain hose? - Captain America - 02-24-2015

(02-24-2015, 04:14 PM)Mylesofsmyles I have a micrometer and stock drain tube at home. I'll measure and report back. No doubt though, 10AN is plenty big. It's not a high pressure or volume hose...just a simple gravity feed. A lot of turbos have an oil restrictive before or at the feed, so again, it's not a high volume application.

Just curious why you'd want to bigger?

I would have to disagree with you, sir. You are right in saying that it is not a high pressure application but it IS a high volume application (foamy oil volume). I measured mine and OD of tube is .780" which correlates to a -12 line. -12 also uses a 3/4 NPT tap. Oil restrictions are used because the foamy oil cannot be returned to the pan quick at full flow causing the turbo to smoke or that is my understanding anyway... in this case bigger is better

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-24-2015

I can't argue this point, as I'm no turbine engineer.

If you'd like, I'm happy to inquire about having 12 AN versions made, but that'll be a separate group buy

RE: -AN threaded Turbo oil drain hose? - raysorenson - 02-24-2015

I just double checked Captain America's measurement and he is, in fact, able to use a caliper.

I'd rather not 2nd guess MB's engineering on this. It might be important to maintain the volume of the drain tube, especially on engines with significant blow by.

RE: -AN threaded Turbo oil drain hose? - wolverine - 02-24-2015

I've never had a problem with -10 drains for turbos (generally speaking).  As long as the hose is always on a 45 deg or less down slope, it should suffice.

But, the thing with the 617 that I have wondered is why the drain enters the pan at such a low point.  It doesnt look to me like its above the oil level when running?

I've seen those aftermarket bolt on turbo kits where you install the turbo drain in place of the actual oil drain plug, YIKES!!!   

I figure that being on the kick-out of the aluminum pan its at least further away from oil windage than if it was into the side flush with the crankcase.  So that must help.

So I wonder too why MB put such a big drain size on these motors???

Also, I have always heard that synthetic oil doesnt foam like dino oil does after the turbo.

RE: -AN threaded Turbo oil drain hose? - baldur - 02-25-2015

There's nothing wrong with plumbing the oil drain below the oil surface in the pan as long as the turbo itself is mounted high enough above the surface. If the turbo itself is close to the surface it can be beneficial to run a breather from the turbo drain flange up into the valve cover.

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-25-2015

12AN is closer to stock size...10AN is just so common in performance turbo market.

We are revising design to see how a 12AN will fit.

Only one option will be provided. I'd like to see a show of hands...who is in for one or the other? Maybe now is a good time to start he group buy list. Who is in regardless of size? Who has to have one vs the other?

RE: -AN threaded Turbo oil drain hose? - raysorenson - 02-25-2015

Yeah, I'll try either size. If 10 don't work I'll do my own 12 and bitch about your product on the intarwebs  Tongue

RE: -AN threaded Turbo oil drain hose? - led-panzer - 02-25-2015

I would be in for a -12 one

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-25-2015

That's 2 for -12AN (including Captain-America) and one indifferent, but for -10AN

A production -12AN is not yet confirmed. I'll let you know what I hear from Josh at Yoshifab.

RE: -AN threaded Turbo oil drain hose? - Captain America - 02-25-2015

This is a great discussion, Gentlemen! bravo for a flame-less thread!

I am in for sure, preference the -12 just to be better safe vs sorry haha... But if a -12 isn't made then I will still take a -10. I was not aware that the -10 is to "go-to" drain size in aftermarket

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-25-2015

Okay, I need to know how common the PCV Oil Return Nipple is.

My '82 300D has it's PCV Oil Return right next to the Turbo Oil Drain...

[Image: IMG_0678.JPG]


The pan mach4 (user from PeachParts, who donated a oil pan) gave Josh lacks this, and you says it's specific for CA cars.  So CA cars have this, and others don't?  

My $0.02 is that it's a cool design to have the nipple, and a user-friendly way of having a reliable PCV Oil Return.  Easy to run a hose & clamp, and convert to an oil catch, or relocate my current catch can.

Can y'all who are interested please share how your OM617 is configured.  Clearance is a concern here.

Also curious how other OM617's are configured....those that lack this nipple, where is your PCV draining to?

RE: -AN threaded Turbo oil drain hose? - Captain America - 02-25-2015

My car is a Cali car so yes it has the PCV nipple but I have mine capped as I have A/W intercooled manifold and I have a crankcase evac nipple in my "up pipe (out the hood)"

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-25-2015

I just measured the head on a -10AN line, from my shelf. It's diameter, from point-to-point (biggest diameter) is 29.25mm

Seems like there'd be just barely enough space, just to let the -10AN fitting just spin freely, and not interfere with the nippe, let alone a hose & clamp on it.

RE: -AN threaded Turbo oil drain hose? - Captain America - 02-25-2015

(02-25-2015, 10:32 PM)Mylesofsmyles I just measured the head on a -10AN line, from my shelf. It's diameter, from point-to-point (biggest diameter) is 29.25mm

Seems like there'd be just barely enough space, just to let the -10AN fitting just spin freely, and not interfere with the nippe, let alone a hose & clamp on it.

Hmmm thats kinda tight, especially if one wants to keep the nipple! I will probably knock the nipple out or off, drill and pipe plug that hole anyway. Not sure about others, or how many other Cali guy are interested in this.

Never a simple solution!

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-25-2015

Sounds like all but one year, 85, CA only cars lacked the nipple.

This adapter needs to work for those WITH the nipple.

Until I can borrow someone's oil pan, WITH nipple, this project is at a stand still

RE: -AN threaded Turbo oil drain hose? - Captain America - 02-25-2015

Fuuuuuuuu

Would have to pull one at the yard and ship or something

RE: -AN threaded Turbo oil drain hose? - raysorenson - 02-26-2015

I'll look at my 85 federal oil pans tonight.

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-26-2015

Yep, unless someone has a spare in the garage, or a motor to pull from. It'll be returned, and I can cover the cost of shipping. Anyone have a spare pan?

RE: -AN threaded Turbo oil drain hose? - baldur - 02-26-2015

My OM662 has the turbo oil drain welded to the oil dipstick tube right above where it inserts into the pan.

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-26-2015

Just asked two local independent shops. No 617 pans. Damn!

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-27-2015

My newest and youngest local Volvo 240 friend, has a Mercedes W123 friend! He is all into his diesels.

Going to meet him, this afternoon, for a pint, and to get the proper oil pan.

RE: -AN threaded Turbo oil drain hose? - raysorenson - 02-27-2015

Have you considered an interference fit fitting sealed with epoxy?

RE: -AN threaded Turbo oil drain hose? - wolverine - 02-27-2015

I do have a pan with the pcv drain.  Seeing as I'm on the other side of the country, it should probably be a last resort cause of shipping cost.  And it would probably take a damn week or more in transit.  Let me if your deal falls through and you really need it.

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-27-2015

Got a pan tonight. I'll package and mail it down to Josh this weekend.

raysorenson...not sure what you mean.

This fitting will be press fit with a assembly compound/sealant.

RE: -AN threaded Turbo oil drain hose? - wolverine - 02-27-2015

Interference fit = press fit, when the hole is smaller than whats going in it.  Kinda like when she says "HELL NO, YOU AINT PUTTING THAT IN THERE!!!"

RE: -AN threaded Turbo oil drain hose? - Mylesofsmyles - 02-27-2015

(02-27-2015, 10:17 PM)wolverine Interference fit = press fit, when the hole is smaller than whats going in it.  Kinda like when she says "HELL NO, YOU AINT PUTTING THAT IN THERE!!!"

Much clearer now...

Yep...it's going to be an interference fit.

RE: -AN threaded Turbo oil drain hose? - Captain America - 03-01-2015

Sweet! Im excited

RE: -AN threaded Turbo oil drain hose? - Captain America - 05-03-2015

Anything ever happen with this?

RE: -AN threaded Turbo oil drain hose? - atypicalguy - 05-03-2015

Getting pretty close for me to figure out how to manage a new drain for a Holset swap also.

RE: -AN threaded Turbo oil drain hose? - mike-81-240d - 05-04-2015

Also curious what's going on.

I could use one like tomorrow.

RE: -AN threaded Turbo oil drain hose? - Captain America - 05-07-2015

(05-04-2015, 03:15 AM)mike-81-240d Also curious what's going on.

I could use one like tomorrow.

I could have used it like last Friday when I unsmashed my oil pan and installed a new pickup