Exhaust mounting bracket bushing issue | FerrariChat
Buy

Exhaust mounting bracket bushing issue

Discussion in '206/246' started by HMB-Dino, Jan 2, 2011.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. HMB-Dino

    HMB-Dino Formula 3
    Silver Subscribed

    Jun 28, 2010
    2,282
    Pebble Beach, CA
    Full Name:
    RonG
    #1 HMB-Dino, Jan 2, 2011
    Last edited by a moderator: Sep 7, 2017
    While checking out the underside of my 71 Euro M-Series for corrosion and to see how long my ToDo list might get, I noticed an issue with the bushings that appear to be part of the exhaust mounting brackets (see photos; one of left side, one of right side). It appears that the bolts that go thru the bushings and connect the bracket to the frame are under a lot of stress. Note that the bolts appear to be pulled sideways, which undoubtedly resulting in one breaking. Or is there actually a bolt at each of the top and the bottom of the bushing?

    So is this an `easy' fix, or should I add this repair to the list of items I should leave to those that repair/restore Dino's for business?
    Image Unavailable, Please Login
    Image Unavailable, Please Login
     
  2. yasmin

    yasmin Formula Junior

    Mar 18, 2004
    939
    Melbourne, Woking. Turin
    #2 yasmin, Jan 2, 2011
    I recently replaced my exhaust system. Although my rubber mounts were not ripped or broken, I replaced some of them and it was a relatively easy process.

    Superformance has them...

    www.superformance.co.uk/a-246/exhausts.htm
     
  3. daviekj

    daviekj Formula Junior
    Silver Subscribed

    May 9, 2008
    486
    UK
    #3 daviekj, Jan 3, 2011
    Last edited by a moderator: Sep 7, 2017
    HMB-Dino

    The failure you show is not surprising. I am not sure it is a single bolt that passes through the rubber. There may be two separate bolt threads either end with just rubber between. On assembly, getting the two nuts (top and bottom) tightened up while aligning the exhaust mounting brackets is a little fiddly. Need to make sure the rubbers are not under horizontal shear strain when tightened up.

    Also check with your supplier (inc above) that the bolt diameter is correct for the mounting bracket. I don't have a record of the thread, but from memory I initially received bolts with too big a diameter.

    Not sure the pictures below help much. The nuts holding the bracket to the exhaust are more tricky. You may need to slacken these to re-align your exhaust bracket and reduce the strain on the mounts.

    If you are just replacing the rubbers, these can be done from within the wheel arch, so just need to remove the wheel. The exhaust mountain bracket nuts may need access from under the car.

    Kevin
    Image Unavailable, Please Login
     
  4. jselevan

    jselevan Formula 3

    Nov 2, 2003
    1,873
    #4 jselevan, Jan 8, 2011
    Last edited: Jan 8, 2011
    This is a common failure. The vibration mounting rubber pieces often tear. Despite one's best efforts, the exhaust cannot be mounted without applying significant strain/shear on the rubber. The new rubber shock couple will sustain the load for a rather long period of time, but, alas, they will eventually fail. No big deal. Cheap parts to replace. Get them through McMaster Carr or the usual suspects (GT Car Parts, Rutlands, etc.). Easy to do.

    http://www.mcmaster.com/#shock-mounts/=ai7dkt

    They are quite pricey at $1.69 each !

    I believe the exhaust mounts are 6 mm X 1 mm. Fifty pounds seems more than adequate. Examine the link above.

    Jim S.
     

Share This Page