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Old 02-10-2017, 01:51 AM   #1
Mini-Skoolie
 
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Blowby bypass oil leak T444e 7.3 CCV crank case ventilation

Greetings,

I am new to the T444E but not the 7.3. I am familiar with the motor in Ford Trucks and Vans.

Do all/most school buses come with the blow by bypass below the motor? (Crank Case Ventilation) If yes, should closing off the bypass when the engine is running cause oil to spill on the ground?

Thanks in advance.


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Old 02-10-2017, 08:44 AM   #2
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blow by bypass? there should be a draft tube coming off of the driver side valve cover.. it will point out at the ground,

a common upgrade though was to install a RACOR CCV ventilation kit..

CCV3550 RACOR CRANKCASE VENTILATION FILTER SYSTEM INTERNATIONAL T444E FORD 7.3L | eBay

this recirculated blow-by Crankgase gases back into the intake before the Turbo.

if the filter in the RACOR clogs you would likely have issues with oil leaks from any number seals..

if you have a draft tube and you close it up you will likely blow oil out from every seal .. esp the rear / front mains and valve covers...

-Christopher
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Old 02-10-2017, 09:11 AM   #3
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Oil dribbling out the crank case vent is common with these. Many people have installed simple oil catch cans at the end of the tube:
https://www.google.ca/search?q=7.3l+...M6PYjwSvpqyYDQ
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Old 02-10-2017, 09:32 AM   #4
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over-filling the engine oil even by a quart or 2 will cause more oil loss out the draft tube as well..
-Christopher
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Old 02-16-2017, 09:29 AM   #5
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Quote:
Originally Posted by cadillackid View Post
over-filling the engine oil even by a quart or 2 will cause more oil loss out the draft tube as well..
-Christopher
Quote:
Originally Posted by jazty View Post
Oil dribbling out the crank case vent is common with these. Many people have installed simple oil catch cans at the end of the tube:
https://www.google.ca/search?q=7.3l+...M6PYjwSvpqyYDQ
Thanks for the info.

FOR CLARIFICATION: Do ALL/MOST Internationals T444E have the draft tube pointing out from the bottom of the engine? It seems like they do from the factory.

I thought it was odd that when I plugged the "draft tube" oil started to drip out. I wonder how/why Ford 7.3's do not have draft tubes from the factory and why the oil does not leak out.. .. its the "same engine"

Also is it likely that any damage would occur from clogging up the draft tube like I did or keeping it closed permanently?

I will attempt to Google that.
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Old 02-16-2017, 09:35 AM   #6
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Yeah, don't plug that tube! You risk building crank case pressure and, as was stated, blowing out seals!

The power stroke 7.3s do have a crank case vent, but it is directed back into the intake, before the turbo so that the crank case gases are burned. This is due to the emission standards of the time. Pickup trucks being under a different emissions standard than medium/heavy duty trucks.
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Old 02-16-2017, 09:37 AM   #7
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It's a common (though illegal) "upgrade" for the 7.3l Powerstroke folk to route the CCV the same way as the Navistar/International T444e. Then they'll either install a catch can or live with the dribble.
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Old 02-16-2017, 02:04 PM   #8
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Quote:
Originally Posted by jazty View Post
Oil dribbling out the crank case vent is common with these. Many people have installed simple oil catch cans at the end of the tube:
https://www.google.ca/search?q=7.3l+...M6PYjwSvpqyYDQ
They aren't "dribbling", they just like to mark their spot!
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Old 02-16-2017, 02:07 PM   #9
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Quote:
Originally Posted by cadillackid View Post
over-filling the engine oil even by a quart or 2 will cause more oil loss out the draft tube as well..
-Christopher
I've already discovered this, though it wasn't my fault it was over-filled.
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Old 03-21-2017, 10:50 AM   #10
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Year: 98
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My 98 t444e has a filter installed. the tube from the valve cover goes to this filter housing which is supposed to be under vacuum because of another hose to the vacuum side of the turbo. then there is a tube from the bottom of the housing to the oil filler where the oil is supposed to dribble back into the engine.

I had oil dribbling out of the dipstick so suspecting positive crankcase pressure I inspected this filter. I don't think the filter element had ever been changed. Once I plugged the vacuum tube and ran the tube from the valve cover straight to the ground the dipstick leaking stopped.
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