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Power Strokes
6.4 Aftermarket
Upcoming Head Gasket replacement
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[QUOTE="kleake, post: 1458035, member: 25987"] Well guys, bad news..... About 10k miles on the new heads and they started leaking just like before. Get over about 22-25psi boost and it starts pressurizing the coolant. I've been babying it for about 2-3k and just pulled the heads again trying to figure out what went wrong. The only thing I can think of is either my torque was out of spec, or the studs stretched after a few heat cycles. To try and verify, I marked one head bolt, then re-torqued with my torque wrench and a new torque adapter (both are within 2lbs of each other at 250). I was able to turn the stud approximately 1/4 turn farther than where it was. So, i'm thinking new gaskets, re-torque and all should be ok. However, when I pull the heads, I find something I did not expect. [ATTACH=full]171673[/ATTACH] [ATTACH=full]171674[/ATTACH] [ATTACH=full]171675[/ATTACH] [ATTACH=full]171676[/ATTACH] Yep, the valves hit the pistons...... If you remember from previous, I had issues with the head from Ford and I had to modify the valve bridges because of incorrect valve stem height. The front and rear cylinders were the tightest tolerance and holding those valves open the most so I had to shave the most from those valve bridges. The front and rear pistons are the ones with the valve marks on them. Now, I don't believe they have been hitting after I corrected the issue since the marks are not shiny or worn, it just looks like they hit once when I first cranked it over, so I am pretty confident the problem has been solved when I modified the valve bridges. However, the one mark on the rear piston is fairly deep. Could this cause a future crack in the piston, or could it have caused other issues like compressing a rod bearing, or putting an indention on the cam? I'm not sure if I should slap it back together with new gaskets, make sure the torque is right, and run it, or if I should go back to Ford and see what they are willing to do since it was their faulty heads that caused the problem in the first place. At this point, i'm just not sure Ford would do anything about it at all really. The truck has been running strong with no issues other than the gaskets starting to let go again around 10k miles. I've only pulled one head so far. I'm afraid Ford may just want to send me new heads, which is fine, except now I have modified my valve bridges as well so I would need those also. I'm also not sure if I want to mess with the time/shipping and all of that again too, and that isn't going to fix the pistons anyway. Thoughts? [/QUOTE]
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