7.3 idi turbo oil dumping out from downpipe - Diesel Forum - TheDieselStop.com
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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 10-15-2011, 04:41 PM   #1 (permalink)
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7.3 idi turbo oil dumping out from downpipe

alright yall this is my first post here so take it easy on me. im in desprite need of some ideas. i just pulled my turbo today on my 93 f350 7.3 idi with the factory ats 093 turbo to replace my valley pan grommet on the turbo oil drain because it wasnt on there and i had a crazy amount of blow by. after i get the turbo back on and the down pipe hooked up i cranked the truck and let it idle to see if i had any blow by. i had none but now i have oil dumping out of where my 3in down pipe fits to my 4 inch exhaust pipe. the truck idled for about 5 min and dumped out close to 1/2 a quart of oil. any ideas why this happened or what i could do to fix the issue? could it be a seal in my turbo? can it be related to the fact that the blow by cant escape? please any info is greaty appreciated
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Old 10-15-2011, 05:05 PM   #2 (permalink)
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Since you replaced the valley pan grommet, Is it possible that the valley pan was changed ? If so then there is a baffle where the oil drain is. Since the N/A trucks use that hole for the CDR, the baffle keeps oil from splashing up into the CDR. When you change the valley pan with a turbo, the baffle restricts oil flow and makes a big mess. Take the turbo back off and then use an AWL and punch a good amount of holes in the baffle.

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Old 10-15-2011, 05:31 PM   #3 (permalink)
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I did that when I put the turbo on. Just took it for a test drive and I'm blowing blue smoke everywhere. The cars behind me disappeard in the smoke. I'm guessing my rings are gone? Anybody know of any additives that actually work for ring repair?
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Old 10-15-2011, 07:00 PM   #4 (permalink)
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could be rings or the valve guides/seals. I would do a compression test first.
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ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
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Old 10-15-2011, 07:50 PM   #5 (permalink)
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Thanks for the help. If it is rings any good additives or anything I can do?
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Old 10-15-2011, 07:55 PM   #6 (permalink)
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I haven't seen any fix for bad rings other than replacement.
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ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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Old 10-15-2011, 09:51 PM   #7 (permalink)
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If the CDR is not on or blocked, the pressure can cause the turbo to leak oil past the seal and into the down pipe.
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Old 10-15-2011, 10:55 PM   #8 (permalink)
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I don't actually have a cdr. I have a breather on my driver side valve cover lik a gasser would have and its routed into my air intake. Does that work the same way? I pulled the breather of and lots of blow by still comes out and it seems to blow out like its under a lot more pressure than it was before I put the valley pan grommet in. If I remove the valley pan grommet should my blow by return to how it was before I put it on? It come out frm under the turbo but none from the exhaust or have I likely damaged the rings worse some how?
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Old 10-16-2011, 05:52 AM   #9 (permalink)
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Quote:
Originally Posted by rockstarf150 View Post
I don't actually have a cdr. I have a breather on my driver side valve cover lik a gasser would have and its routed into my air intake. Does that work the same way?
NO! The CDR is an oil separator and PCV valve. Having nothing means increased blow-by AND increased oil consumption.
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Old 10-16-2011, 08:44 AM   #10 (permalink)
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... valley pan grommet on the turbo oil drain because it wasnt on there and i had a crazy amount of blow by.
Something's not making sense here. If it wasn't there, what was? That's your drainback route for the oil that's fed to the turbo bushings. Sounds like somehow you've now blocked it off and are forcing oil past the turbo seal if you're actually suddenly pouring engine oil out the exhaust pipe.
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I don't actually have a cdr. I have a breather on my driver side valve cover lik a gasser would have
Sounds like you're describing a CDR. Does it have a bracket and is it held on with two bolts (IIRC), has a rubber grommet from it into the valve cover, then a tube running from it to your air intake stream on the air box?
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If the CDR is not on or blocked, the pressure can cause the turbo to leak oil past the seal and into the down pipe.
No it won't. Crankase pressure has no effect on the turbo seals. Excess pressure WILL cause oil leaks past the front crankase seal, rear main, and if high enough pop the dipstick out of the tube.

Above is a view of the bottom bolt-on side of a CDR. If that's what yours looks like, you've got one.
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Last edited by LMJD; 10-16-2011 at 08:49 AM.
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Old 10-16-2011, 10:30 AM   #11 (permalink)
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No that's not what mine has. It has a breather from the valve cover but its not the cdr that its supposed to have. Its a cheap on from autozone. Ill post pics. But yes the tube\mount that drains the oil back to the valley pan was on there but the grommet that seals the oil drain tube to the valley pan was never installed when the turbo was put on so all the blow by escaped the crankcase from the valley pan there.
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Old 10-16-2011, 10:42 AM   #12 (permalink)
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Not sure if this info is essential but I neglected to say the blue/white smoke smells like raw diesel and it doesn't actully start until its been running for about 5 minutes. And the oil dumping from my downpipe smells like diesel and its extreamly thin and jet black. Oil is onl a month old its shell rotella with a zinc additive.
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Old 10-16-2011, 10:45 AM   #13 (permalink)
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Oh boy, sounds like the previous owner was one of the many IDI forum experts. If the factory designed it, gott'a "improve" it, especially when it comes to the perfectly functioning CDR system. In which case IMO all bets are off when it comes to diagnosis by long distance. If someone just put a regular breather cap on the valve cover then all your blowby will be escaping through its mesh screen (if it has one) under the hood rather than running by CDR tube into the airbox just downstream of the air filter.
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Last edited by LMJD; 10-16-2011 at 11:44 AM.
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Old 10-16-2011, 12:11 PM   #14 (permalink)
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here is my set up. now it appears i have oil leaking from the turbo
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7.3 idi turbo oil dumping out from downpipe-turbo-il-leak.jpg   7.3 idi turbo oil dumping out from downpipe-valve-cover-breather.jpg  
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Old 10-16-2011, 12:22 PM   #15 (permalink)
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That's not the factory set up

for the '93/'94 7.3 IDIT. Unless the design is a whole lot different in '94, the FACTORY intake looks like this:


If you look close enough you can see the CDR on the D/S valve cover, Right next to the filter minder in the picture.
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1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually Photos
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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