Is Blow-by ok on 7.3 ? - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 08-19-2011, 12:37 PM Thread Starter
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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

2003 Ford F250 6.0 powerstroke 4x4.
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Early 1999 Ford F250 7.3 Powerstroke 4x4
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post #2 of 21 Old 08-19-2011, 12:51 PM
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A little is perfectly normal.

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post #3 of 21 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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post #4 of 21 Old 08-19-2011, 12:55 PM Thread Starter
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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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straight pipe, intake
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post #5 of 21 Old 08-19-2011, 12:57 PM
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Make sure its not windy...

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post #6 of 21 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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post #7 of 21 Old 08-19-2011, 01:03 PM Thread Starter
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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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ZF6 manual trans, ext cab short bed
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straight pipe, intake
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post #8 of 21 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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post #9 of 21 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.

Email: Dave@powerstroke.org
2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

Leveling kit, 315/70/17 Kelly TSRs on Method race wheels
ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
Flowmaster/MBRP Hybrid Exhaust
Edge Insight CTS
Coolant filter
Bulletproof diesel FICM EGR Delete, Oil Cooler and Water Pump, and Light bar.
Dually LED lights from Stealth Automotive/Xpedition Outfitters
No Limit Fab 6.0 Cold Air Intake
http://www.bulletproofdiesel.com/default.asp
http://nolimitfabrication.com/
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post #10 of 21 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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