Heat Shield Rattle

Discussion in 'General Motoring' started by Wiarton Willy, Sep 24, 2003.

  1. My '99 Forester has had it's heat shield tightened twice and it is still
    rattling at >3000 rpm. The dealership tells me the rattle is very common
    in Subarus and is difficult or impossible to fix. They want to remove it,
    claiming it is only to prevent grass fires when off-roading. I figure it
    also acts as a rock-guard for the exhaust.

    I don't take it off road but it sees lots of winter weather and has had
    plenty of rocks strike it at highway speeds.

    Is this a common problem?
    Is the heat shield impossible to secure?
    Is the heat shield a trivial part?

    Any experience would be helpful,
    Wiarton Willy, Sep 24, 2003
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  2. Wiarton Willy

    Gene Guest

    Yeah, I've got a 2001 Outback Limited, and the same problem has occurred.
    It's pretty common, from what I uunderstand. And yes, the dealership is
    great for excuses, but light on any real action. And since I really *do*
    take this car off-roading, I'm not about to remove the heat shield just yet.

    Here's an idea I'm going to try, as soon as I get the critter back on the
    lift: I'm going to place a spacer washer above and below the bolt holes (not
    too thick; just enough to allow for greater mechanical advantage when
    tightening the bolds down) and torque the whole assembly to factory spec.
    From what I can gather, the two spacer washers will "clamp down" in a little
    metal sandwich, and will grip the heat shield more effectively, holding it
    in place, but givving it no "wiggle room".

    It's just an idea - I'll let you know how it turns out...

    Gene Moody
    Gene, Sep 25, 2003
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  3. Wiarton Willy

    Mark Guest

    Why not use lock-tight on the screws? Or find someone that can weld
    and have them fix the problem.... I would not allow them to take off
    the heat shield. This seems like half ass way of fixing somthing.
    Mark, Sep 25, 2003
  4. Wiarton Willy

    F. Plant Guest

    I'm not yet too familaiar with subarus but I had similar problems with a
    civic. A couple of other suggestions:

    -if extra clamping preasure dosn't help maybe slightly bending the lips to
    make better or less contact.
    -put spacers between the halves to amply seperate the 2 halves.
    -use a bit of high heat silicone to keep the metal parts seperated. Maybe
    even let it set up befor reassembly, so its putting a up a bit of resistance
    to being clamped dowm. Sometimes even a blob on the edges or at some key
    point is enough to dampen the harmonics.

    Good luck
    F. Plant
    F. Plant, Sep 25, 2003
  5. Wiarton Willy

    ed Guest

    Easy fix: get a hose clamp of the right diameter, use a washer or two to
    take up the space between the shield and the pipe (bend the washer to
    conform to the pipe), and tighten the clamp. Lasts for years, but get the
    all stainless clamps used for underground work. Most dealers simply remove
    the shields when they get loose.
    ed, Sep 25, 2003
  6. Wiarton Willy

    meld_b Guest

    Interesting! Our 2002 Outback started rattling and the dealer ordered
    parts! I had assumed this was under warantee... maybe I better ask. Glad
    this thing is new... Seems like we are leaning into the warantee pretty
    heavilly. -D
    meld_b, Sep 30, 2003
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