Rocker arm?
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Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, Rocker arm? in Cadillac Escalade Forums; Hi all. I'm hearing an odd rattling sound coming from the engine when I start the car but when it ...
  1. #1
    drewusmaximus is offline Cadillac Owners Member
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    Rocker arm?

    Hi all. I'm hearing an odd rattling sound coming from the engine when I start the car but when it warms up the sound is gone. When I accelerate I can hear it flutter but after a few minutes the sound goes away. I had read that the rocker arm is stuck then it loosens up. I changed the oil a few days before with Mobil 5000 5w30. Any thoughts would be greatly appreciated!!
    Thanks in advance!!

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    the cadillac man's Avatar
    the cadillac man is online now Cadillac Owners Master
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    Check the heat shield on the muffler

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    drewusmaximus is offline Cadillac Owners Member
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    Re: Rocker arm?

    Thanks for the response. Where's the heat shield?

    ----------

    Thanks for the response. Where's the heat shield?
    Do I look under the car close by the engine? Btw it's a 02 escalade AWD 6.0l
    Thanks!

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    the cadillac man's Avatar
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    Quote Originally Posted by drewusmaximus
    Thanks for the response. Where's the heat shield? ---------- Thanks for the response. Where's the heat shield? Do I look under the car close by the engine? Btw it's a 02 escalade AWD 6.0l Thanks!
    Its welded to the muffler topside

    Mine broke a weld and would do like yours is doing
    I took two water hose clamps(the largest the store had) and joined them together and wrapped the whole thing around the muffler then tightened it tight

    No more rattling

  6. #5
    drewusmaximus is offline Cadillac Owners Member
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    Re: Rocker arm?

    I have the truck on the ramps but I can't find the heat shield. Can someone tell me where exactly is it located? Thanks!!!

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    the cadillac man's Avatar
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    Quote Originally Posted by drewusmaximus
    I have the truck on the ramps but I can't find the heat shield. Can someone tell me where exactly is it located? Thanks!!!
    It should be on the muffler

  8. #7
    drewusmaximus is offline Cadillac Owners Member
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    Re: Rocker arm?

    I'm confused. Is the heat shield on the muffler in the rear? Or on the front of the exhsust? The sound is in the front. Sounds like more on the driver side of the engine.

  9. #8
    the cadillac man's Avatar
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    Quote Originally Posted by drewusmaximus
    I'm confused. Is the heat shield on the muffler in the rear? Or on the front of the exhsust? The sound is in the front. Sounds like more on the driver side of the engine.
    The shield is on the muffler in the rear

    I had the same issue with the sound

  10. #9
    Retrax is offline Cadillac Owners Fanatic
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    Re: Rocker arm?

    It could also be broken exhaust manifold bolts. That is a common problem with these trucks. When the manifolds heat up the sound tends to go away. Check all the bolts from the manifolds to the cylinder heads on drivers and passenger sides. There is a replacement stud kit available and also a "clamp" type fix that attaches to the manifold to clamp it down.

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    drewusmaximus is offline Cadillac Owners Member
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    Re: Rocker arm?

    Quote Originally Posted by Retrax View Post
    It could also be broken exhaust manifold bolts. That is a common problem with these trucks. When the manifolds heat up the sound tends to go away. Check all the bolts from the manifolds to the cylinder heads on drivers and passenger sides. There is a replacement stud kit available and also a "clamp" type fix that attaches to the manifold to clamp it down.
    I didn't think about that.. I will definitely check. My stepson had an f150 that made the same fluttering sound when he accelerated and it was the bolts on the manifold that were bad. So the exhaust was escaping at that connection thus the fluttering sound. Where can I buy that kit? It shouldn't be too bad to do since the bolts are broken. Just add the new gasket and slip on bolts and tighten. But I will check to see if that is the problem prior to purchasing anything..
    Thanks for the info!!

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    Retrax is offline Cadillac Owners Fanatic
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    Re: Rocker arm?

    Here's a link to the clamp down type fix

    http://kralautoparts.com/index.html

    And here's a thread where guys have replaced the bolts with a stud kit

    http://www.cadillacforums.com/forums...old-bolts.html

  13. #12
    drewusmaximus is offline Cadillac Owners Member
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    Re: Rocker arm?

    Retrax. Thanks! Mine started with a ticking sound. I assumed one of the valves needed adjusting. Then it evolved to the fluttering sound. And from that thread you sent me that's exactly what is happening. Sure enough two bolts on the manifold are broken on the driver side!! UGH.. It's not an easy fix and of course, I will have to do the job since we don't have 1000.00 for someone else to fix it. It doesn't seem too bad to do but, I'm not a mechanic and don't have impact wrenches or a welder. So, i'm trying to figure out how I will approach this.. Sigh..

  14. #13
    Retrax is offline Cadillac Owners Fanatic
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    Re: Rocker arm?

    Well, if you are in a bind you could try the Kral Auto clamps. Ordering one for the front of the head and one for the rear of the head would only cost about $75.00 total for the two parts and should be a fix for that side of the engine. Unfortunately, I don't personally know anyone who has used them but it looks like a legit product. I would consider giving it a try. You probably want to get on this ASAP to avoid possible warping which can cause more expensive repair issues.

    Do you know how to weld, or know someone who does? You can rent a welder inexpensively. I know the trick of welding on another bolt to the broken bolt shank (as described on the other thread) can be pretty successful to extract the bolt if there is enough sticking up above the surface of the cylinder head, otherwise you are looking at having them drilled and/or tapped for extraction by a machine shop and I don't think that can be done with the head still installed on the engine block.

    If you do get all the bolts out, I wouldn't put the manifold back on with new bolts. You run the risk of the same thing happening. Apparently they should have used a larger diameter bolt. If you get some hardened studs from ARP or similar, you shouldn't have the issue again.

  15. #14
    Retrax is offline Cadillac Owners Fanatic
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    Re: Rocker arm?

    One more thing, your rocker arms should not make any valve train noise unless a rocker is broken. These engines have hydraulic lifters ( not solid lifters ) so the push rod adjustment to set valve lash when the cylinder head is installed should not need to be messed with after the initial instal.

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