The third time of blown head gasket with studs - Ford Powerstroke Diesel Forum
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Old 04-24-2013, 09:02 AM
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The third time of blown head gasket with studs

The first time the truck had blown head gaskets at 21,000 miles when it was still under warranty they put the stock head bolt back in it. Then truck at 50,000 miles the head gasket were blown again and at that time I work a deal with ford to put arp studs with oem head gasket in was covered under warranty. Now 77,700 miles down road from the last head gasket job the truck only has 127,700 miles on it. The OEM head gaskets are blown and had arp studs. I was wondering if I should O-ring the cylinder heads or just take the heads to machine shop get them check out? I use my truck to pull my t300 bobcat
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Old 04-24-2013, 09:06 AM
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did they check the heads to see if warped? sounds like thats the issue also should magna flux them too
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Old 04-24-2013, 09:14 AM
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The second time they check the heads to if they were warped and they were good at that time.
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Old 04-24-2013, 09:31 AM
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Ford says that as long as they are within 0.003, IIRC, then they are "flat" and do not need machining. International says that they need to be flat like we like them but ford thinks otherwise. The way they check it is take a flat edge and use a feeler gauge.

I had my HG's and ARP's put in by TSD and they machined my heads, the drivers side was 0.002 out and the other was 0.005 out, IIRC. I put about 15k very very hard miles on it and never had a problem with the HG's.

I believe that the reason that you are having continued HG failure is because the heads where not flat or incorrect installation. If they over-torque the ARP's they will blow also.

Just my .02.

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Old 04-24-2013, 09:31 AM
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Ford's standard for whether they consider the head flat or not leaves a lot to be desired. Your continuing to blow head gaskets is most probably due to improper preparation. Not only to the head and deck need to be perfectly flay, the surface must also have the proper prep for the gasket to get a proper seal. The most probable is that the heads were not truly prepared correctly. If they are not it doesn't matter what kind of fasteners you use, they won't last.
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Old 04-24-2013, 09:34 AM
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never just check. always get them resurfaced! thats more than likely the problem
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Old 04-24-2013, 09:34 AM
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Also what kinda EGT's are you seeing while towing? If you are seeing very high EGT's, 1500+ sustained, then there is your problem.

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Old 04-24-2013, 11:23 AM
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Quote:
Originally Posted by thomaslord84 View Post
Also what kinda EGT's are you seeing while towing? If you are seeing very high EGT's, 1500+ sustained, then there is your problem.

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1500 sustained would melt pistons. i have drove a very long way at 1200 sustained
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Old 04-24-2013, 01:29 PM
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Ford's actual spec for the block flatness is .004" across the entire head, .002" across any 6" area, or .001" across any ~1" area. The head is .004" across the entire area, and that's it. That's a pretty large tolerance.

My guess is they weren't flat. Ford says they are, but they weren't. Ford also wont machine them at all, they say it can't/shouldn't be done. If they're not flat, they order a new head. However, some of the new heads come in "out of spec" to what we would consider good too. The only true way to do this is have the heads decked. Ideally you'd check block flatness too. With gaskets blown that many times...
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Old 04-24-2013, 01:59 PM
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the deck surface of the block is probably ruined.
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