Re: Head differences
i was under the impression only the 05 aviator 4.6 had the better 7/8 cooling passages.
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Re: Head differences
There was never a head tick issue. Originally it was though to be a lifter tick and they had came up with the head fix by replacing the head however the actual noise is a result of collapse piston skirts on the piston its self. Due to excessive piston to wall clearance. The cylinder is actual cone shaped and the largest being at the top when the piston comes to the top of the cylinder the piston starts to rock back and forth when the cylinder fires rattling all the way down the cylinder.
Also the aviator head is different from the 03-04 head just for the record. And the fact that they were the only coolant improved head was a miss conception as well. As was the rumor of no production heads came with 9 thread |
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OK, I'm probably beating a dead horse here, but I have heard repeatedly that the 7/8 cooling issue caused valve guide galling and subsequently a ticking valve sound.
So, this is not the case then? That would mean if one doesn't already have "the tick", they will likely never experience it at all, since piston slap tends to be a tolerance issue from day 1? |
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if a skirt collapse you will hear it as a tick
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uhm I worked for for as a master tech for over 9 years and yes that is what WE did because that is what ford wanted to do!!!!!! you would be suprized how much money they saved because a lot of the car fell out of warranty or blew up
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Haven't the vast majority of these cases been isolated to the rear driver's side area (7&8)? Wouldn't that still suggest a (cooling?) problem in this area? Also, it is my understanding that cylinders are honed straight, but that pistons are somewhat cone shaped (larger at the top) to accommodate heat expansion. Is this not the case? Has this been affecting all pistons/cylinders? |
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really? cuz there are a few hundred Cobra owners on SVTp that had their head replaced and have had no problems since..... |
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I don't understand how a head replacement (which cures the tick) stops a piston rattle problem. It seems to me if it were the pistons, then there would still be a tick even after the heads were replaced.
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I have March 03 built car. So I'm assumming I have the original 4 thread spark plug hole heads. I don't see any blue paint either head. Is the blue stripe obvious or is it hidden under the valve covers? Just one more thing to worry about as I prepare to put the car on the open track.
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http://i133.photobucket.com/albums/q...1/fa5fc9c9.jpg I borrowed this image from EPIKMACH, sorry I just needed a quick pic. Credit for the pic goes to him! |
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Blue Blurr32V thanks for the info. The next time I crawl under my car I'll take a look.
Mark |
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I do not claim to be correct and I am sure most people are not as knowledgeable as you appear to be on this subject, so with out adding more negative coments to your post, can you please dumb this down for me and explain this a little further? You mention that that Ford increased cylinder pressure to stop the piston clatter, how? Did Ford change the chamber size? I am not trying to be a smart ***, I just would like to know how things work. |
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I was able to stop the ticking by simply replacing the stock guides with bronze ones.
Jerome |
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Look not trying to sound like an Richard but here are the facts!!!!!!
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What you are saying makes sense. However, when the guides were changed, a valve job was done, the deck was milled, and the chambers were tampered with. The static presure remained roughly the same at about 190psi.
It would be interesting to do an experiment by simply changing the guides and seeing what that does. Jerome |
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mine has april 03 build date,and blue on driverside head only.i have 30,000 klms on it and have no tick or cooling problems so am i just lucky/ or is problem yet to come
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