22psi in the coolant system is a BAD thing!!!!! - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 27 (permalink) Old 04-07-2009, 03:52 PM Thread Starter
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22psi in the coolant system is a BAD thing!!!!!

I took the service mangaer and the diesel tech out for a ride with the trailer hooked up. Tooling around town everything was OK. Temps and pressures were normal. Made our way out to the highway and got onto the throttle and things started to happen. The truck pulled well. THe temps never got up high BUT the coolant pressure climbed to 22psi accelerating up a moderate hill. 16psi is normal. Got up to speed. Pressure in the coolant system bleed off and we carried on down the road. After turning around and getting up to speed (only half throttle) the coolant pressure was at 22-23psi. If I had walked on it, I more then likely could have matched the boost pressure. It is official. I need studs. The service manager is OK with me supplying ARP studs and what ever else I would like to do to the truck provided it is concieled or not a remove and replace. So I guess I'm going with studs and delete plates.

Man this has been a drawn out process. But as soon as the hoist is free. I'm in and getting fixed.

For all of those that are having problems with diagnosis. Find a HEAVY trailer and a steady grade. And take the mechanice for a ride. He will have to hook up his coolant pressure gauge for verification. But this is the only way I have been able to prove it. The truck will NOT be down on power. The turbos are too efficient and will make up for any bleed off into the coolant system. The coolant system has to monitored for over pressureing.

Hope this helps all of you out.

Chris.

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post #2 of 27 (permalink) Old 04-07-2009, 04:18 PM
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Thanks Chris, I have a hunch that its not you studs that stretched, there is too many out there running high tunes while towing and nitrous... I read on another site there was a batch of HG's that were no good or something like that but who REALLY knows.

I know I have said it before but I am putting mine back to stock and going to run it for a bit then like you said get a trailer and go for a drive with them, mine is definately worse than it was 6 months ago..

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post #3 of 27 (permalink) Old 04-07-2009, 04:39 PM
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its the HGs all around, Smokin' Joe (rainman) among a few others had the same problem

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post #4 of 27 (permalink) Old 04-07-2009, 05:48 PM
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glad you got it all figured out! good job
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post #5 of 27 (permalink) Old 04-07-2009, 08:56 PM
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Great! Glad you finally got that sorted out! Well these another HG as a puking issue under the belt!!

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post #6 of 27 (permalink) Old 04-07-2009, 10:27 PM
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Quote:
Originally Posted by forcefed6.4ford View Post
I took the service mangaer and the diesel tech out for a ride with the trailer hooked up. Tooling around town everything was OK. Temps and pressures were normal. Made our way out to the highway and got onto the throttle and things started to happen. The truck pulled well. THe temps never got up high BUT the coolant pressure climbed to 22psi accelerating up a moderate hill. 16psi is normal. Got up to speed. Pressure in the coolant system bleed off and we carried on down the road. After turning around and getting up to speed (only half throttle) the coolant pressure was at 22-23psi. If I had walked on it, I more then likely could have matched the boost pressure. It is official. I need studs. The service manager is OK with me supplying ARP studs and what ever else I would like to do to the truck provided it is concieled or not a remove and replace. So I guess I'm going with studs and delete plates.

Man this has been a drawn out process. But as soon as the hoist is free. I'm in and getting fixed.

For all of those that are having problems with diagnosis. Find a HEAVY trailer and a steady grade. And take the mechanice for a ride. He will have to hook up his coolant pressure gauge for verification. But this is the only way I have been able to prove it. The truck will NOT be down on power. The turbos are too efficient and will make up for any bleed off into the coolant system. The coolant system has to monitored for over pressureing.

Hope this helps all of you out.

Chris.

Thanks for that info, friday i will see if the tech will go for a ride with me.

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post #7 of 27 (permalink) Old 04-07-2009, 10:38 PM
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Yeah if the studs had streched, I believe other things woulda happend by now

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post #8 of 27 (permalink) Old 04-07-2009, 10:51 PM Thread Starter
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Sorry guys. I ment that the HG are bad and I will be upgrading to ARP's for future mods.

Is the fuel pump cab on accessible. Ive heard the injectors are. So with the studs and delete plates. All my mods are cab on... Right?

Lets just say not quite stock.
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post #9 of 27 (permalink) Old 04-08-2009, 12:28 AM
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Quote:
Originally Posted by forcefed6.4ford View Post
Sorry guys. I ment that the HG are bad and I will be upgrading to ARP's for future mods.

Is the fuel pump cab on accessible. Ive heard the injectors are. So with the studs and delete plates. All my mods are cab on... Right?
studs are cab off

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post #10 of 27 (permalink) Old 04-08-2009, 12:42 AM
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The HPFP is a cab off job for sure. Where I intern at we had an 08 in for all 8 injectors replaced with the HPFP last week with the cab off and i have to be honest with ya, its nothing to get the cab on and off.

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