'2011 F550 Diesel engine seize! - Page 2 - Diesel Forum - TheDieselStop.com
6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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post #16 of 31 (permalink) Old 08-22-2016, 08:48 PM
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Originally Posted by Phillippeterson View Post
What is a two piece valve?
Nearly all valves used in consumer engines like our 6.7 or nearly every passenger car engine are two piece. The valves in our motors, like the valves in probably every Ford diesel ever made are two separate pieces joined by friction welding or other methods. This is how we get sodium filled exhaust valves. The valve face and the stem are not of the same material by design. The early 6.7's had some manufacturing problems with the valves but this is not unheard of in any mass produced engine.
One piece valves are used in high end applications, racing motors and such. Machining a one piece valve out of stainless is very expensive. But there are hundreds of billions of two piece valves doing their jobs in nearly every consumer grade engine every made.
The stem is joined to the material used to made the face and then hammer forged into shape, then machined. Next time you have a valve in your hands have a close look. You will be able to see the machined area where the two were joined.
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post #17 of 31 (permalink) Old 08-22-2016, 09:04 PM
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When a two piece valve lets go, it is not a small piece floating around. The entire face and portion of the stem fall into the combustion chamber. The damage is catastrophic and complete. Smashing the piston, bending forged rods, hammering out the crankshaft.
I have seen this in factory turbo gas motors. You wouldn't believe how torn up these motors were. And yes these were GM engines.
If this is what happened to the young engine in this thread, Ford already knows of the issue.
Even though it's out of warranty it would be nice to see some coverage.
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post #18 of 31 (permalink) Old 08-23-2016, 05:11 AM
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Yet the early valve failure concern was corrected with redesigned cylinder heads... just sayin.


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post #19 of 31 (permalink) Old 08-23-2016, 09:50 PM
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Yet the early valve failure concern was corrected with redesigned cylinder heads... just sayin.
I read that. I wonder what changes they made to the head that would affect the valve construction?
Do you know if these valves are friction welded?
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post #20 of 31 (permalink) Old 08-24-2016, 07:32 PM
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I would just like to say that being a very long time and loyal Ford customer for over 30 years and my farther who started this company back in 1959 who still to this day drives an F-350 pickup feels betrayed! As you all known my 2011 F-550 with 15,000 miles had a castostrofic engine failure after a Ford recall / reflash and now over a week later are they now saying they can give 2K to begin the engine tear down to see what was the cause . Which is causing my company downtime and loss, I basically have one the best dealer maintained fleets in Massachusetts, not to mention how many Ford vehicles, trucks , cars and SUVs we have purchased in the last 50 plus years , not just under my company name but my personal and family also . Basically I own a 70K paper weight that's been sitting in the dealer , in the morning when I open the doors to my shop and see all of those Ford trucks It makes me sick . And just to think I was getting ready to purchase a new 2017 pickup and F-550 for this next model year , Maybe it's time to change up ! If you ask me Ford should tear down this engine on there dime not mine because it's obvious it's not a big deal that my downtime , money wastefully spent and jumping through hoops to resolve this matter in a timely manner is not important. Sorry that I sound so bitter but I've spent over a million dollars in this dealership in new Ford vehicles plus service and parts and out of respect for everyone I'm trying to remain calm and not say what I really feel !!!! Any ones thoughts or opinions gladly appreciated.


Excuse me for saying so but I usually read these posts and think its posturing for the eyes of people from Ford. Just keep in mind that that kind of thing can work against you if it goes too far and I have witnessed it more than once. With that said I am sure we all understand your frustration and your need to vent... and I am with you on that as well.

My opinion, from someone at the dealership level and having been involved in cases this, is that you need to member that this truck IS IN FACT OUT OF WARRANTY and technically YOUR responsibility. I am thinking that if Ford is stepping up and offering to assist with $2000 toward the diagnosis they are giving you a good faith gesture and one that is rarely seen. I think they are being fair in wanting to determine whether the failure is indeed due to a defect and not neglect or abuse on your part. Once that is determined things can proceed one way or the other but not until that has been determined. That is fair after all, right? Now, if you have maintained the vehicle then it will hopefully play in your favor. Regardless, you would have to pay to diagnose and repair the engine anyway so let it play out. Be patient. If you are as loyal of a Ford customer as you say you are... I might anticipate positive news but do not expect 100% from them. But, it sounds like they ARE working with you. Betrayed? I think not.


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Last edited by ford_doctor; 08-24-2016 at 07:34 PM.
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post #21 of 31 (permalink) Old 08-24-2016, 08:37 PM
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Very mixed feelings on this. Doc is factually and for the most part " look at it this way " correct. Same time doc, we get a little conditioned to this.. You and I because both of our profession ( why independant for 17 hrs. Now ) have had something come up and rock our world. I feel this is the case here. We can take our licks..move to next job. This guy noted the feeling of seeing every morning same case scenarios. Doc, honestly... If he yard was always greeting you with the same every morning, not different vehicles, conditions ect.. Just say ten worst case comebacks in the same lot and it's groundhog day....Well.... If it's was presumed a 100k catastrophic or totally ragged out worn out typical gas motor from era pre 90s might be the norm don't charge that money for the option they don't even have the curtesy to paint the block like it was a 4 banger gasser in an economy car... Doc...not sure of your age or time in this business and to a degree it doesn't matter that much as I see 20 somethings on a regular basis that could almost spin the head..not quite for prime time and if taken out of the mono brand sign of on road vehicles or the equipment field...Theyde be in trouble,,but, you know they should not be blowing up like this..I've read your things and know you know what should and what should not be...
So that was a that thought..
Doing justice to doc's statement... Be cool hang tight.
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post #22 of 31 (permalink) Old 08-25-2016, 04:33 PM Thread Starter
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I just deleted my last post if I sounded like I think I'm above anyone I apologize, that's not what I intended . Bad couple of weeks, not an excuse though, just needed to vent .

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post #23 of 31 (permalink) Old 08-25-2016, 04:36 PM
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So what's the scoop, buddy?
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post #24 of 31 (permalink) Old 08-25-2016, 05:03 PM Thread Starter
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Tomorrow there pulling the cab off , and from what I understand the engine will be next . I don't know what to expect nor do I know what I want them to find out when it comes apart . Just nervous I guess my dealer told me relax we'll see .

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post #25 of 31 (permalink) Old 08-25-2016, 06:44 PM
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Wishing you luck buddy
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post #26 of 31 (permalink) Old 08-25-2016, 07:29 PM Thread Starter
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Thanks , I'll need it .

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post #27 of 31 (permalink) Old 09-07-2016, 01:42 AM
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PC, no hear, my friend..
The asterisk response will explain all.
Silence usually explains all,,,in help with mandated silence.
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post #28 of 31 (permalink) Old 09-14-2018, 11:01 AM
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I just had the motor on my 2011 F550 seize up yesterday, only 36K miles. Still waiting to hear back on the diagnostic.
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post #29 of 31 (permalink) Old 09-14-2018, 08:49 PM
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Sheesh. Is there something about this time of year?? Mine died 2 weeks ago. Cripes!

Ed...KF5INW
2011 6.7L PSD XLT - Dead and gone
2019 6.7L PSD XLT - Still too new!
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post #30 of 31 (permalink) Old 09-15-2018, 07:45 AM
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Sheesh. Is there something about this time of year?? Mine died 2 weeks ago. Cripes!

What was your mileage if you don't mind me asking? It seems all the ones I've heard about are low mileage engines.

2011 F350 4x4 XL Crew Cab Dually

2010 Keystone Fuzion 405 Toyhauler
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