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  #51  
Old 09-12-2011, 11:14 AM
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SuperiorStyles SuperiorStyles is offline
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Weird for it to happen when the 4.7 overheat but sadly mine never over heated.
I decided to just Rebuild the motor cause once the head is off and you have gone that far you might just wanna take the extra time and get everything refreshed and replace.
Plus mine had 150,088 when the engine Blew from Head Failure.
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  #52  
Old 09-12-2011, 11:54 AM
svares svares is offline
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I hear ya,
local machine shop told me these dropping seats is from overheating and they saw a few. Head and seat expand at different rate when heated right up.

As in your case, im sure there are other reasons it can happen, who knows. kms was low on mine and im only keeping it another year or so, so I just wanted to fix what was broken.

I also changed all 16 lash adjusters and rocker arms on the right hand existing head and the left (used/replaced) head. This was to deal with the possibility of any collapsed adjusters

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  #53  
Old 09-12-2011, 12:00 PM
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yep same here. I change everything and the block is the only old thing in the truck lol
Well I'm glad to hear your up and running and not stuck waiting to get it fix.
Now and days you need 2 or more cars to get around and these these trucks get around the way we want it too. not including the fact that most people see us coming and move out the way lol
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  #54  
Old 09-12-2011, 12:23 PM
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Truck was easy to work on

If timing chain is being reused, you dont have to take it off, of the cover.

Head is easy to pull if you ziptie the chain to sprocket and remove the camgear. i held mine to the master cylinder with a bungee cord to keep tension on the lower sprocket.

Just be sure its at TDC and you unbolt the chain guides where they attach to the head
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  #55  
Old 09-12-2011, 12:33 PM
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Quote:
Originally Posted by SuperiorStyles View Post
thank you for staying around to find out
Great thread and thanks for sharing! Very glad it turned out so well for you.
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  #56  
Old 10-02-2011, 07:52 AM
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Thank You and I hope It help any one that has the Tapping aka Knocking or whatever it's called lol all we know it's a headache every time we hear it lol
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  #57  
Old 11-02-2011, 12:10 PM
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bumping to the top to help those in need at the moment.
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Old 11-03-2011, 03:26 PM
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Quote:
Originally Posted by svares View Post
My 4.7 overheated and dropped a valve seat.
Compression test showed which one, rocker arm as off

I pulled the head, used head, new gasket and bolts. $150 plus a water pump and thermostat and im back up and running. 70,000 miles on the motor.

Seems to be most common when overheated

I think the valve seat goes first. This causes the valve to cock sideways slightly, which puts an unnatural side-load on the hydraulic lash adjuster (the 4.7 does NOT have "lifters" at all, by the way, the lash adjuster acts as the fulcrum for the cam follower aka "rocker arm") causing it to crack out of its boss if neglected long enough.

I agree that overheating is usually the root cause.
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  #59  
Old 11-03-2011, 03:40 PM
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Quote:
Originally Posted by 440Magnum View Post
I think the valve seat goes first. This causes the valve to cock sideways slightly, which puts an unnatural side-load on the hydraulic lash adjuster .
Actually, failure doesn't even require the valve to move sideways at all, and that would mean the guide was pretty worn anyway. The valve refusing to close all the way leaves the roller follower completely loose and unloaded, so it can jump off the lash adjuster and then bind when the cam tries to open the valve again, breaking the lash adjuster out of its boss in the head casting.
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  #60  
Old 11-03-2011, 04:44 PM
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That sounds like a good explanation for someone else in my case it was not. Also when I type lifter is to help give an idea to what I'm talking about to does not mechanically incline to know where or what a lifter goes. Some may know whats a valve adjuster but it's better to explain it in an easier term to understand.
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