Valves are worn out! Why? - Ford Powerstroke Diesel Forum
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Old 08-11-2011, 06:38 AM
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Valves are worn out! Why?

Took my heads to the machine shop to get them checked. Still straight .000 and no cracks, but some of the valves are not sealing. The guy said it was probably from an over boost condition. Turbo and injectors are stock and I run the SRL+ for studded trucks. Except for the first hour of the tune being installed I baby this truck. How are some of you running a bigger turbo and injectors and not having any problems? Also should I get better valves and from where? I don't want this to happen again. Any input would be great.
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Old 08-11-2011, 09:00 AM
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The valves are worn out?...Or is it the valve seats are cracked? There are two sides that create a seal, failure on one side would prevent the seal from being complete. I don't know of a history of 6.0L valve failures but the 6.0L heads are known to develop valve seat cracks:
Ford Power Stroke Bulletproofing Tactics Craked Valve Seat Close Up Photo 13
You may get hardened valve seats as the 4-wheeler article indicates although there is debate on whether this really makes a difference. I doubt an overboost condition cracked the valve seats as the pressure of boost (even overboost) is not on the magnitude of cracking iron...now coolant loss from an EGR cooler failure...steam EASILY produces the pressure required to crack iron. The speculation of the cause is academic although protection against coolant intrusion with a better EGR cooler is a preventative action that is both beneficial and can reduce the likelihood of high pressure steam intrusion to the combustion chamber while boost will ALWAYS be developed in a turbocharged engine. Getting hardened seats will at least address sealing the combustion chamber. I don't think you have worn valves but I could be wrong. Double check the seats for cracks.

Jonathan
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Old 08-11-2011, 09:22 AM
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Yep I have seen many good running trucks with cracks in the valve seats. But I have not seen sealing problems without cracks. The cracks typically are what cause the leaking problem. The cylinder heads should be magnifluxed, not just visual inspection. Also for the heads not to be warped even a little is pretty unusual. Even known good trucks without problems will have some warpage... IMO.
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Old 08-12-2011, 06:23 AM
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I did the heads last spring and had the heads machined to .000. So they have only had 12,000 and 12months to get warped. They were magnafluxed with no cracks. I was told 2 exhaust valves, 8 intakes, and 30 of 32 valve guides. I am still at a loss.
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Old 08-12-2011, 06:39 AM
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All I would chalk it up to is poor quality that the ford heads are. The best thing you can do is just machine them flat, install hardened backseats, new guides, and hope for the best.
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Old 08-12-2011, 06:41 AM
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This provided that they had a satisfactory magnaflux.
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Old 08-12-2011, 06:45 AM
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Quote:
Originally Posted by skeeter60 View Post
I did the heads last spring and had the heads machined to .000. So they have only had 12,000 and 12months to get warped. They were magnafluxed with no cracks. I was told 2 exhaust valves, 8 intakes, and 30 of 32 valve guides. I am still at a loss.
Something sounds WAY off to me, since that sounds like a catastrophic failure. The reason for the exhaust valve seats to become cracked is usually due to too much fuel and excessive timing or as mentioned below steam from a ruptured EGR cooler could also do it... Matt's tunes are VERY clean and I wouldn't expect this to be a factor at all, so that leads me to believe that it wasn't inspected carefully in your prior build when they were installed. You mentioned the heads being magnafluxed before being installed last time. Did you get any pics of them and/or how did you the shop verify them before? Oh and for heads to not be warped even slightly is highly unlikely. What is/was your compression prior to pulling the heads?
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Old 08-13-2011, 04:10 PM
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I never had the compression checked before I pulled the heads again. I too do not believe that it was the tune. I have heard nothing, but good things about them. However I have also not heard of this before so I wanted to give as much detail as possible. It is possible they missed the valves before, but I had them magnafluxed both times and had no cracks. He didn't say the valves were cracked just that they and the valve guides were worn out. It is possible that this happened prior as the EGR was deleted during the last build so that is out. It is just one thing after another with this thing
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