2008 F250 6.4 - Ford Powerstroke Diesel Forum
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  #1  
Old 01-05-2013, 05:54 PM
jwg jwg is offline
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2008 F250 6.4

how much blow by out the dipstick is too much

Last edited by jwg; 01-05-2013 at 06:23 PM.
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Old 01-21-2013, 04:36 PM
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ANY blowby out the dipstick it too much!
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Old 01-21-2013, 04:56 PM
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2008 F250 6.4

I disagree. 6.4s are known to have a little blow by. They are designed that way on purpose. It allows expansion in your motor due to heat when the truck is running hard. U wouldn't want ur cylinder walls being scored after the truck gets warmed up.

To answer ur question, while the truck is idling unscrew ur oil fill cap and place it over the hole where u just unscrewed it. If the cap gets blown off u should be a little concerned with blow by. If it just stays on there and rattles due to the motor idling ur fine.


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Old 01-23-2013, 09:28 PM
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2008 F250 6.4

Hey Wilson, got a question for you.

How is impossible that a 6.4 could have excessive blowby visible from the oil fill cap but none from the dipstick?

I recently had the opportunity to do a three week mock internship with the diesel guys at my ford dealership - kind of a rare opportunity I stumbled upon totally by accident. While I was there a 6.4 came in - customer complained about excessive white smoke and loss of power. No catastrophic failures but a number of the pistons had scuffs similar to the ones pictured.

Of course it didn't happen if it wasn't photographed... 1) Truck, 2) driver's side head, and 3) #7 (I believe) piston

2008 F250 6.4-imageuploadedbyautoguide1359008763.071851.jpg2008 F250 6.4-imageuploadedbyautoguide1359008775.054776.jpg2008 F250 6.4-imageuploadedbyautoguide1359008787.271529.jpg


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Old 01-23-2013, 09:32 PM
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2008 F250 6.4

Oh yeah, compression was down ~50psi on the passenger's side cylinder bank and around 30 on the driver's side. Power balance was also noticeably out on 7 and four, I believe.


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Old 01-24-2013, 05:29 AM
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I'm not a Ford diesel mechanic, but i would find it hard to believe there is "excessive" blow by out of the cap and not the dipstick. Perhaps your dipstick is a little caked/clogged at the bottom?

That's awesome about your experience with the mock internship--did you learn a good bit? Make you wanna be a mechanic?
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Old 01-25-2013, 05:29 AM
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it would be an interesting career choice but warranty work doesn't pay very well and the way things are going people seem less and less willing to shell out their own cash.

so its not really possible then? as i understand it the oil fill cap sits on top of the passenger's side head and the dipstick runs up from the crank case, no?
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