Is Blow-by ok on 7.3 ? - Ford Powerstroke Diesel Forum
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Old 08-19-2011, 12:37 PM
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Is Blow-by ok on 7.3 ?

On my Super Duty (see sig) at idle when I take the oil fill cap off there is a small amount of steam that blows out of the filler continusly. Someone told me this is fine, others said this is a problem. truck runs great with no problems
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Old 08-19-2011, 12:51 PM
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A little is perfectly normal.
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Old 08-19-2011, 12:52 PM
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If you can lay a paper towel over the filler and it blows off, you have excess blowby. Simple test.
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Old 08-19-2011, 12:55 PM
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ok ill do that after work. Truck has 264,000 on it but I doubt that it will blow the towel off...we will see. Crossing fingers that it dont.
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Old 08-19-2011, 12:57 PM
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Make sure its not windy...
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Old 08-19-2011, 12:58 PM
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Quote:
Originally Posted by Clay Henry View Post
If you can lay a paper towel over the filler and it blows off, you have excess blowby. Simple test.
A paper towel? I heard is was the oil cap. Guess I will have to try the towel now out of curiosity
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Old 08-19-2011, 01:03 PM
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Originally Posted by Clay Henry View Post
Make sure its not windy...
O CRAP!!! MY TRUCK IS FRIED! *as the paper towel flies across the road* lol
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Old 08-19-2011, 01:32 PM
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Quote:
Originally Posted by justinlogue5_0 View Post
A paper towel? I heard is was the oil cap. Guess I will have to try the towel now out of curiosity
A ping pong ball is a better test. The cap usually vibrates off, and that freaks people out thinking that it's the blow-by.

Last edited by ToMang07; 08-19-2011 at 02:53 PM.
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Old 08-19-2011, 01:38 PM
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Quote:
Originally Posted by Clay Henry View Post
If you can lay a paper towel over the filler and it blows off, you have excess blowby. Simple test.
not on a 7.3 it will do that right off the showroom floor

Do the oil cap test.
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Old 08-19-2011, 06:51 PM
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Quote:
Originally Posted by Dave View Post
not on a 7.3 it will do that right off the showroom floor

Do the oil cap test.
Oh thank goodness.
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