Air in hpop - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 15 (permalink) Old 07-12-2014, 03:30 AM Thread Starter
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Air in hpop

Put a new updated hpop on my 04 6.0. My mechanic said my truck will have a little trouble starting for a day or so because of air in the hpop. Has anyone ever experience this?
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post #2 of 15 (permalink) Old 07-12-2014, 03:42 AM
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Re: Air in hpop

Yes, any time your HPO system is opened up, it'll take some time to get the air purged out. Drive it hard a bit and it'll eventually purge itself out.

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post #3 of 15 (permalink) Old 07-12-2014, 11:21 AM Thread Starter
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Re: Air in hpop

Thanks. Just checking. Still new to the diesel world just learning as I go.
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post #4 of 15 (permalink) Old 07-15-2014, 12:48 AM
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Re: Air in hpop

Should only take a few minutes of aggressive driving. Not days.
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post #5 of 15 (permalink) Old 07-15-2014, 06:59 PM Thread Starter
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Re: Air in hpop

I can't drive the truck hard right now due to the motor has been remanufactured an bored .020 over. I'm still in the break in stage.
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post #6 of 15 (permalink) Old 07-15-2014, 07:05 PM
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Re: Air in hpop

I grew up with a saying " break in a motor fast and you will have a fast motor, break in a motor slow and you will have a slow motor". Break in are for bad machining and irregularities. Many race motors are given the break in down the quarter mile!
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post #7 of 15 (permalink) Old 07-15-2014, 08:30 PM
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Re: Air in hpop

Do the .020 over motors run much better than a stock motor? Any more hp ? And do they sound much different?
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post #8 of 15 (permalink) Old 07-15-2014, 11:24 PM Thread Starter
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Re: Air in hpop

Fuel mpg got a little better. Other than that haven't put a load on it to see a difference.
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post #9 of 15 (permalink) Old 07-15-2014, 11:28 PM
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Re: Air in hpop

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Originally Posted by 06.0dually View Post
Do the .020 over motors run much better than a stock motor? Any more hp ? And do they sound much different?
no. not really measureable. and no
.020 over bore is to repair damaged /worn cylinder wall the difference in size is insignificant. The only real gain is from restoring ring seal and compression to specification

Fixing ford diesels since before they had turbochargers
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post #10 of 15 (permalink) Old 07-15-2014, 11:30 PM
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Re: Air in hpop

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Originally Posted by hzippere View Post
Put a new updated hpop on my 04 6.0. My mechanic said my truck will have a little trouble starting for a day or so because of air in the hpop. Has anyone ever experience this?
Correct the engine will have an extended crank for a while, until the hpo system is free of air. 10-15 miles @ highway speed is all that is necessary

Fixing ford diesels since before they had turbochargers
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