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  #1  
Old 07-30-2017, 02:37 PM
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617 Nipple at Upper Oil Pan

'83 300TD (purchased and resided in CA entire life) I decided to tackle what I assume is a leak at my turbo drain tube. When I ripped into the engine I found an unconnected nipple at the upper oil pan between the turbo train tube and what I though is an oil separator line. That had me scarring my head, until I moved the oil separator line and realized that it's never been connected. Before I tear into the god forsaken turbo drain tube, could this be the source for the oil leak?

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  #2  
Old 07-30-2017, 02:51 PM
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Originally Posted by pitofpity View Post
Before I tear into the god forsaken turbo drain tube, could this be the source for the oil leak?
I certainly would leak oil if not connected. Even when connected, it's not the best design-sort of like an inverted funnel. It would probably be worthwhile to renew the o-rings on the nipple before reconnecting.

The separator tube should be secured by a one-bolt clamp down under the turbo. Those bolts tend to vibrate loose and the pipe shakes off the nipple.
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Last edited by tangofox007; 07-30-2017 at 04:19 PM.
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Old 07-30-2017, 03:25 PM
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That's right. My separator tube was loose with no connections. Well I'm off to replacing the o rings. That o ring at the bottom is a real PITA to get to.
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Old 07-30-2017, 04:22 PM
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Was the clamp still on the tube? If so, all you need is a bolt and self-locking nut. I used an aircraft-quality stop nut and have had any trouble with it since.
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Old 07-30-2017, 04:38 PM
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I remember having to go pretty deep to get the tube bolted back. I don't remember the details but it was in the process of stopping all of the leaks.
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  #6  
Old 07-30-2017, 10:19 PM
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That Drain Tube from the Air Filter housing has either a welded tab somewhere in the middle of the Tube or has a clamp. Both attach behind a metal strap below the Turbo.

The tube can come loose from the clamp or the welded on metal tab breakes off (sometimes leaving a hole in the tube).

Both ends of the tube have to have a nipple with an O-ring inserted into them and that clamp in the middle secured in order for it to stay in place.

http://www.peachparts.com/shopforum/diesel-discussion/280787-turbo-drain-blow-drain-seal-replacement%3B-mein-kampf.html
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Old 07-31-2017, 03:14 AM
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Changed out the o-rings and secured the tube with a clamp, since original welded connection broke. 617 really makes the filter shake at idle, so I am not surprised that it failed and shook the pipe loose. Well, seems like the turbo drain is still leaking - I guess I am not done. Is there any reward in trying to plug the leaks on these engines?
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Old 07-31-2017, 09:31 AM
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Originally Posted by pitofpity View Post
617 really makes the filter shake at idle, so I am not surprised that it failed and shook the pipe loose.
You might want to research "rack idle pin adjustment."
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Last edited by tangofox007; 07-31-2017 at 10:49 AM.
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Old 07-31-2017, 09:52 PM
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Originally Posted by pitofpity View Post
Changed out the o-rings and secured the tube with a clamp, since original welded connection broke. 617 really makes the filter shake at idle, so I am not surprised that it failed and shook the pipe loose. Well, seems like the turbo drain is still leaking - I guess I am not done. Is there any reward in trying to plug the leaks on these engines?
It depends on how big the leak is.
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Old 08-01-2017, 06:53 AM
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Exclamation Leaks Weeps & Seeps

" Is there any reward in trying to plug the leaks on these engines? ".

Most certainly so ! .
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  #11  
Old 08-01-2017, 07:23 AM
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No reason the turbo drain tube would inherently leak. You can replace the gasket, O-ring, and rubber bushing where it enters the upper oil pan. Parts are cheap and many posts w/ photos. Can't expect 34 yr old rubber and gaskets to still be good on any car. I recall using an HBNR (green) O-ring, but would have used Viton if one that size was in my kit. The factory used cheaper Nitrile (Buna-N). No reason to have to go thru auto parts suppliers to get an O-ring (ditto for bearings), but many keep whining "can't get".

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