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4.7L/4.7L HO/4.7L Gen II Engines Questions regarding the 4.7L V8 engine

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  #1  
Old 10-24-2010, 06:27 PM
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HectorR2006 HectorR2006 is offline
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valve roller rockers keep falling off

Okay, let me start by saying that I just finished paying over $1400 to get remaned heads/ valve assembly because 2 of my rocker arm's/ rollers fell off some how. anyways, now that I have brand new heads, it did it agian. Is there something else that could be causing the rollers to fall off like that. the work is under warranty, so im gonna bring it back to the shop but what could possibly be causing this truck to do this with all the top end being new? Has anyone had any similar problems? Its a 2001 durango slt4x4 4.7 btw.
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  #2  
Old 10-24-2010, 09:41 PM
rimfire,22 rimfire,22 is offline
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hectorR2006,

Funny you mention this. My 4.7 Durango is in the shop because of a loss of compression to the no.5 cylinder and one of the possibilities is that maybe the rocker may have fell off too!!! He believes my valve is either stuck in the open position due to carbon or maybe the rockers. I too am puzzled about the possibility. So far he says I have no head gasket issue so for that I'm sorry you had your redone for such a large price.

rimfire,22
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Old 10-25-2010, 12:55 AM
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You said you have reman heads, did they rebuild/resurface your old heads? Dodge does not recommend resurfacing the heads on these motors and I have seen some shops do it and the end result is cam followers that keep popping out of place. I have had luck on one motor with installing new lash ajusters but the other 3 that came to me from another shop we were not able to fix until new heads from Dodge were installed.

Just a question but has this motor been severly overheated that you know of at some point of it's life??

Forgot to mention that low oil pressure can cause this issue also. Was the top end of the motor sludged up when they pulled it apart?
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Old 10-25-2010, 12:05 PM
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The engine has not overheated (not since I owned it) but when the shop did show me my engine it did have tons of slude on the top. The oil pressure was always high before the rebuild but now that you mention it, the oil pressure guage wasnt steady like it used to be. when i would turn it on after the rebuild, it would start off on high then make its way towards the middle then eventualy towards the lower "safeline". If i accelerated it, it would go back to high. So from what you stated, do you think the engine is no-good.
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Old 10-25-2010, 07:46 PM
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You may have a lifter/lash adjuster that has went bad. If it doesn't stay pumped up it could allow for the cam follower to pop out.
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Old 10-25-2010, 08:43 PM
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You need to put an actual mechanical oil pressure gauge on it to see what the oil pressure is doing.

If the engine had tons of sludge on the top side then you can bet that the oil pan is full of sludge also and may be clogging the oil pickup tube.
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Old 10-29-2010, 10:54 PM
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so the shop ended up pulling the passenger side head and, well...one of the valve seats had fallen off and jamed itself between the valve and the opening. That inturn caused the rocker to fall off this time.
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Old 10-31-2010, 04:49 AM
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Hopefully there was little to no damage.... Keep us posted.

NICK
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Old 04-03-2011, 04:17 AM
Jdk4387 Jdk4387 is offline
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this exact same thing just happened to me except cylinder #4. Also had bought re-man heads 8 months ago.
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Old 04-03-2011, 03:13 PM
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Quote:
Originally Posted by Jdk4387 View Post
this exact same thing just happened to me except cylinder #4. Also had bought re-man heads 8 months ago.
I have heard that in some cases where the seats have been replaced that if not instlled properly the seats themselfs could come lose. When this happens they can prevent the valve from closing all the way... this leads to slack in the valvetrain as the cam lobe comes around to BDC, the follower is no longer riding the cam... and can just fall off...

Oil pressure and bad lash adjusters can also lead to this problem.

SPEED SAFE, NICK
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Old 04-07-2011, 02:32 PM
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Does anyone see a pattern here with reman heads???
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Old 04-09-2011, 02:53 PM
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Quote:
Originally Posted by l1tech View Post
Does anyone see a pattern here with reman heads???
I sure do.

Sucks to hear about the problems guys. To the OP, is your issue gonna be warranted?
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Old 04-11-2011, 02:58 PM
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sorry it took a while to reply but yeah they repaired the damage under warranty. I love my truck even more now. It seems to be getting great gas mileage now too!
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Old 04-12-2011, 01:46 AM
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Awesome, glad to hear it.
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Old 06-19-2011, 08:35 AM
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I had the same thing happen about a year ago, due to an overheat. Also tapped the piston!



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