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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #11  
Old 01-04-2012, 08:33 AM
CamoBoy34 CamoBoy34 is offline
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Yes you are reading that right. And when I took the timing chains off I marked EVERYTHING and left the chains and sprokets how they came off when I set them to the side. So I don't think it is a timing issue unless it jumped a tooth on timing. Is that even possible?
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  #12  
Old 01-04-2012, 09:58 AM
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That's kinda it the direction I'm thinking. Since it fired up properly after repair and the problem manifested very quickly, it makes me wonder if the mechanical timing changed.

When did the repair, did you have the timing cover off and fully remove all 3 timing chains, or did you wedge the tensioners on the upper chains and pull the sprockets off the heads?
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Last edited by brad12kx; 01-04-2012 at 09:59 AM. Reason: opyt
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  #13  
Old 01-04-2012, 11:12 AM
CamoBoy34 CamoBoy34 is offline
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I fully removed all the chains and sprockets for the timing. If I can I will try and get a video loaded of what its doing to try and help you guys out
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  #14  
Old 01-04-2012, 06:49 PM
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http://static.photobucket.com/player...-01-35_957.mp4

Hope the video works I have to hold the gas pedal to the floor for it to start and run. Then it back fires and dies
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  #15  
Old 01-04-2012, 08:20 PM
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well i got home from work and took both valve covers off to check timing. the timing is spot on. then the fun begins.... after the valve covers were off i tried to start it thats when i heard a tick comeing from the right side so i stopped and went to wiggle some rockers. a rocker on cylinder numbers 2&6 just fell off when i wiggled them. are the probable causes? stuck valve, bent valve, valve spring, or is it that post that is on the other end of the rocker? also do you know if these heads are non interference heads?
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  #16  
Old 01-05-2012, 11:46 AM
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Quote:
Hope the video works I have to hold the gas pedal to the floor for it to start and run. Then it back fires and dies
So after it starts and is thumping (in the video), your holding the pedal to the floor the whole time?

I don't recall if they are interference engines....maybe superiorstyles knows he knows a lot about the 4.7L's. I'd figure out why the rockers were so loose, that alone could be the problem. If the rockers are too loose the valves won't open at the right time and can cause poor running or no running conditions. I had the valves adjusted too tight on a vehicle (just barely) and it wouldn't start since the valves weren't sealing (no compression). Your issue may be just the opposite where the valves are opening late (due to play from the loose rockers).
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  #17  
Old 01-05-2012, 11:49 AM
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After rereading your initial post I remembered you took the engine apart to do a head gasket then reassembled it and it ran ok for a short time. I would bet you overlooked something or adjusted the valves wrong or forgot a set screw (if there are any) when adjusting the valves...hydraulic lifters can be a PITA to get adjusted properly sometimes. Are you sure you let the lifters bleed down correctly when adjusting them? I would bet this is the problem and the rockers came loose in that short time due to something not 100% right with the valve adjustment....just my best guess...
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  #18  
Old 01-05-2012, 01:51 PM
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Yes I held the gas pedal to the floor the whole time. And I didn't think you could adjust the valves on this motor. If you can how do you because I'm flustered on this whole thing.
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  #19  
Old 01-05-2012, 01:57 PM
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Quote:
Yes I held the gas pedal to the floor the whole time. And I didn't think you could adjust the valves on this motor. If you can how do you because I'm flustered on this whole thing.
Wow that is weird that it ran like that with the pedal all the way down...

Man this is getting out of my comfort zone with OHC engines, I've done very little work with OHC's. I think, and am pretty sure, that the way you adjust the valves is to shim the underneath of the "lifters". They are not called lifters but you know what I mean (I think). The things that are on the other end of the "rockers" (I don't think they are called rockers either...). I believe you pull them out and shim them. I think you should PM member superiorstyles, he knows a lot about the 4.7L and OHC engines, my actual experience with OHC is very limited... I will say though that if you didn't adjust the valves this could certainly be the problem. How do the "rockers" attach, over a stud with a nut?
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  #20  
Old 01-05-2012, 06:22 PM
CamoBoy34 CamoBoy34 is offline
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Ok i will pm him. The rockers are held in just by the valve spring tension. Because one side is on the hydraulic tensioner then the other end is on the valve while the cam rides on the center of the rocker on top of a roller. If you seen a pic you would see what I mean
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