Oil problem - Diesel Forum - TheDieselStop.com
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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post #1 of 17 (permalink) Old 04-11-2016, 07:14 AM Thread Starter
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Oil problem

My truck goes through 4 quarts of oil a week and It hardly leaks could it also be the CD-R valve? I was reading that the CD-R valve controls blow back into the turbo and I did see there was some oil sitting in the turbo so does anyone know if it's time to replace the CD-R valve it's also known as crankcase depression regulator
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post #2 of 17 (permalink) Old 04-11-2016, 07:43 AM
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If your using/losing 4 quarts in a week, I doubt it's going through the CDR. Any smoke? Is your tailpipe oily?
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post #3 of 17 (permalink) Old 04-11-2016, 08:42 AM
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There is ALWAYS oil sitting in the turbo intake flex coupling on any diesel, it has nothing to do whether they have a CDR or not. The CDR is just an open vent to allow crankcase fumes (blowby) to enter the intake air stream. It's always open during normal engine operation so it's rather impossible for them to go "bad" as you read on some sites. The first thing to check would be for excessive blowby which is most always the cause of excessive oil consumption, other than a significant leak. If you took your pickup into an IH (Navistar) truck dealership with an oil consumption complaint, they have a long diagnosis checklist to go down. First on the list is check amount of blowby and nowhere is a CDR even mentioned.
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post #4 of 17 (permalink) Old 04-11-2016, 11:31 AM Thread Starter
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So do you guys think it's probably bad head gaskets because I have noticed on both sides of the engine block it seems like there's oil around the manifolds
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post #5 of 17 (permalink) Old 04-11-2016, 11:37 AM
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odds are leaking valve cover gaskets! for the oil around the head area, Oil in coolant or the revers would be an indicator of a head issue far as leakage goes, As said check blow by, do a compression leak down test to look for weak rings to see if it is burning it.
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post #6 of 17 (permalink) Old 04-11-2016, 11:55 AM
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A leakdown test isn't the greatest for checking rings, scored cyl. wall, etc, condition. An excessive blowby test is quicker and more accurate.
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So do you guys think it's probably bad head gaskets because I have noticed on both sides of the engine block it seems like there's oil around the manifolds
The manifolds are above the head gskt area. Usually when there's oil/antifreeze leaking due to head gskts it's at the rear and very slight. It's easily seen by looking up on both sides where the heads meet the block.
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post #7 of 17 (permalink) Old 04-11-2016, 12:56 PM
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If you listed your truck in your signature, a more intelligent diagnosis could be made. Like how many miles on the clock, year etc.

Valve guides, missing/broken valve seal caps and all the rest listed above..
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post #8 of 17 (permalink) Old 04-11-2016, 01:04 PM Thread Starter
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I'll do that I have a 1994 f250 7.3 idi turbo diesel with 167,000 original miles original engine and transmission
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post #9 of 17 (permalink) Old 04-12-2016, 12:52 PM
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I'll do that I have a 1994 f250 7.3 idi turbo diesel with 167,000 original miles original engine and transmission
You have to put that info in your signature. Also add if it's a early or late 94. A late 94 is a Powerstroke computer controlled. An early 94, the turbo was an option. If it's a Powerstoke, you might want to post in the 94 to 97 forum.

Oil consumption. It's possible the turbo O'rings are blown. Does it Blue smoke out the exhaust?

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post #10 of 17 (permalink) Old 04-13-2016, 07:37 AM Thread Starter
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Yes it's an early 94 and it does blue smoke but only for about 30 seconds

1994 F250 XLT IDI 7.3 turbo diesel garret turbo 4x4 single cab long bed with 168,000 miles original engine and transmission all stock 4speed auto With 4:10 gears straight piped
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post #11 of 17 (permalink) Old 04-13-2016, 09:46 AM
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Yes it's an early 94 and it does blue smoke but only for about 30 seconds
Maybe be a bit more specific? If you're referring to a cold startup, smoke for about 30 seconds is perfectly normal. To minimize smoke complaints, that's why Ford spec'd the cold fast idle and cold timing advance feature. I wouldn't worry too much about turbo seals, first, they have seals, not O-rings, and second after working on these things for decades, for all the severe duty these critters undergo in regard to heat and spin speed, turbos very seldom give any trouble, bushings or seals. Oil consumption is way more common to be one of the options mentioned above.

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post #12 of 17 (permalink) Old 04-13-2016, 10:55 AM
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My Boo Boo, should have said seals.

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post #13 of 17 (permalink) Old 04-13-2016, 11:30 AM Thread Starter
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Okay thank you for your feedback I greatly appreciate it!!

1994 F250 XLT IDI 7.3 turbo diesel garret turbo 4x4 single cab long bed with 168,000 miles original engine and transmission all stock 4speed auto With 4:10 gears straight piped
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post #14 of 17 (permalink) Old 04-13-2016, 09:59 PM Thread Starter
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I think this is probably where it's leaking from so would it be the valve cover gasket?
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post #15 of 17 (permalink) Old 04-14-2016, 07:29 AM
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I think this is probably where it's leaking from so would it be the valve cover gasket?
Sure looks like it to me, did you try tightening it up?

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