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1994.5 - 1997 7.3L Power Stroke Diesel  

Magic oil!

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Old May 23, 2023 | 07:22 AM
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Magic oil!

Hey all,
I’ve been having this issue lately, my truck is drinking oil at an ridiculous pace. At least a gallon every week. Not leaking as much but it’s going somewhere else for sure. Attached is a video of the idle smoke while cold. It doesn’t smoke as bad during the day after it’s warm. Makes me think rings. Opinions?
 
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Old May 23, 2023 | 07:38 AM
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Have you looked at your fuel filter lately? It could be injector orings? Possibly turbo seals?
 
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Old May 23, 2023 | 08:22 AM
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From: Bahstun
see if fuel filter is black, if black that means orings leaking by into fuel rails
if blue smoke while driving, then turbo seal shot
 
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Old May 23, 2023 | 01:33 PM
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I will check fuel filter for sure when I get back. Last time I checked it was good. I guess the smoke does have a slight blue tint to it. I’m just worried it’s rings!
 
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Old May 23, 2023 | 02:47 PM
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From: Bahstun
Diesels burn oil so rings isnt the first thing to worry about

a dead cylinder will make blue smoke or the Exhaust turbo seals will
 
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Old May 23, 2023 | 04:09 PM
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I think if the rings were bad enough to burn a gallon of oil weekly there would be some significant blow-by too.
 
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Old May 23, 2023 | 09:26 PM
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Originally Posted by 96SD
I think if the rings were bad enough to burn a gallon of oil weekly there would be some significant blow-by too.
I will check tomorrow after driving it to work. It is a used turbo from another 7.3. It starts up fine for the most part when it’s above 70. I plan to have injectors tested . Hopefully it’s a turbo issue elrather than a ring.
 
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Old May 24, 2023 | 07:18 AM
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Originally Posted by 96SD
I think if the rings were bad enough to burn a gallon of oil weekly there would be some significant blow-by too.
this constitute as bad? Lot of smoke but barely any pressure
 
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Old May 24, 2023 | 09:09 AM
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From: Bahstun
put oil cap on upside down, it should float on the neck and not blow off at idle or at 2k RPM
 
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Old May 24, 2023 | 09:54 AM
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smoke and vapor is one thing and could be caused by a number of things like oil brand, relative humidity, oil temp, oil age, lots of stuff. Actual blow by is pressure filling the crankcase most likely caused by rings not sealing. Like Knotty said if there is enough crankcase pressure to blow off the oil cap then you have excessive blow-by.
 
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Old May 24, 2023 | 06:28 PM
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There was minimal blowby. Almost the same amount my 06 cummins had, which was what i would say, normal. There is excess vapor for sure, but the blow by seems normal for a diesel. When someone mentions the turbo seals, are they talking about the pedestal or the turbine shaft seals?
 
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Old May 24, 2023 | 06:30 PM
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Originally Posted by knottyrope
put oil cap on upside down, it should float on the neck and not blow off at idle or at 2k RPM
Originally Posted by 96SD
smoke and vapor is one thing and could be caused by a number of things like oil brand, relative humidity, oil temp, oil age, lots of stuff. Actual blow by is pressure filling the crankcase most likely caused by rings not sealing. Like Knotty said if there is enough crankcase pressure to blow off the oil cap then you have excessive blow-by.
see above reply.
 
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Old May 24, 2023 | 06:34 PM
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Originally Posted by 96SD
smoke and vapor is one thing and could be caused by a number of things like oil brand, relative humidity, oil temp, oil age, lots of stuff. Actual blow by is pressure filling the crankcase most likely caused by rings not sealing. Like Knotty said if there is enough crankcase pressure to blow off the oil cap then you have excessive blow-by.
Though it does come out of the dipstick tube... lol
 
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Old May 24, 2023 | 10:05 PM
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From: Bahstun
Originally Posted by Delmink
There was minimal blowby. Almost the same amount my 06 cummins had, which was what i would say, normal. There is excess vapor for sure, but the blow by seems normal for a diesel. When someone mentions the turbo seals, are they talking about the pedestal or the turbine shaft seals?
All seals, bearings and orings are included with a turbo rebuild kit from riffraff diesel including the pedestal orings.
 
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