News

360 DIY Gearbox Mount / Bushing Replacement

Discussion in 'Technical Q&A' started by FerrariDublin, Jul 25, 2011.

  1. awatkins

    awatkins Formula Junior

    Apr 10, 2005
    345
    SFO Peninsula
    Full Name:
    Alan Watkins
    #26 awatkins, May 15, 2013
    Last edited: May 15, 2013
    At first blush there seems to be ambiguity about which of 186698 or 237531 is current for the 430:

    (from Ricambi America)
    [186698 RUBBER BUSHING FOR G/B SUPPORT STR] $353.71 each
    This item is used in the following applications:
    Vehicle Quantity * Table Location Where Used
    360 Challenge 1 26 7 GEARBOX - COVERS
    360 Modena 1 33 7 GEARBOX - COVERS
    360 Spider 1 33 7 GEARBOX - COVERS
    Challenge Stradale 1 31 7 GEARBOX - COVERS
    F430 (05-08) 1 29 7 GEARBOX - COVERS
    F430 Spider 1 29 7 GEARBOX - COVERS


    [237531 GEARBOX SUPPORT PAD ] $174.82 each
    This item is used in the following applications:
    Vehicle Quantity * Table Location Where Used
    430 Scuderia 1 29 7 GEARBOX - COVERS
    F430 (05-08) 1 29 7 GEARBOX - COVERS
    F430 (05-08) 1 29 7 GEARBOX - COVERS
    F430 Spider 1 29 7 GEARBOX - COVERS
    F430 Spider 1 29 7 GEARBOX - COVERS

    However the 430 coupe page says:

    Location Part Qty* Description Price each
    7 237531 1 GEARBOX SUPPORT PAD $ 174.82
    7 237531 1 GEARBOX SUPPORT PAD -Not as spare part- -Replaced by 237531- $ 174.82
    7 186698 1 GEARBOX SUPPORT PAD -Not as spare part now- -Replaced by 220338- $ 353.71

    And there seems to be no sign of 220338 anywhere, and 237531 replaced itself? Whatever...

    IAE 237531 is later and cheaper but for some reason was never called out for use in the 360 group.
     
  2. To remove this ad click here.

  3. FerrariDublin

    FerrariDublin F1 Rookie

    Jun 14, 2009
    3,446
    Dublin, Ireland
    Full Name:
    Greg
    For anyone interested there's a well known UK website selling the 186698 part off at a very reduced price of Stg£48.00.

    Fits.......

    360 Challenge (2000)
    360 Challenge Stradale
    360 Modena
    360 Modena
    360 Spider
    360 Spider
    430 Coupé
    430 Spider
     
  4. awatkins

    awatkins Formula Junior

    Apr 10, 2005
    345
    SFO Peninsula
    Full Name:
    Alan Watkins
    #28 awatkins, Oct 11, 2013
    Last edited by a moderator: Sep 7, 2017
    Just an update based on my following these excellent instructions but using the Hill Engineering tool on a Challenge Stradale:

    1. I purchased the tool from Ricambi America, who provided their usual fast and efficient service: 95973219 INSTALLER/REMOVER- TRANS MOUNT/UPPER : Ricambi America

    2. The tool is assembled into the bushing for either removal or replacement: cup on one side, mandrel on the other, and long threaded rod through both. The rod is longer than it needs to be to provide the travel required to remove or replace the bushing. This matters only because you need to loosen the exhaust manifold to catalytic converter joints to allow the catalytic converters to drop a couple inches to clear the ends of the rod. To do this you need to remove the muffler, but you need to do that anyway in order to get the wrench swing you need to operate the tool. I did not attempt to shorten the rod to avoid this, and do not know if it could be shortened that much and still work.

    3. It took a lot of force on an 18" ratchet handle to get the bushing moving. Dribbling a little penetrating oil around the periphery of the bushing seemed to reduce the force required. However, as the bushing moves out of the transaxle casting the force required is lower and lower of course. I used this ratchet handle 1/2" Drive 18" Ratcheting Breaker Bar. Regardless, it takes many turns and a fair amount of force to remove the bushing, so be prepared for a bit of a workout.

    4. When installing the new bushing it is very easy to get it started crooked, so during the first few turns it is extremely important to watch the bushing closely to make sure it is going in straight. If it goes in crooked under any force at all you will have to disassemble the tool, reverse it, and press the bushing back out. This gets old very quickly so go slowly until you have a several turns on the tool during which the bushings stays straight and the amount of force is constant.

    5. As a matter or preparation I spent some time smoothing the outside of the new bushing with a fine file and rounding slightly the beveled end of the bushing, which goes in first.

    6. If you are installing the 430 bushing (see below), as I did, mark the non-beveled (trailing) end of the bushing case at a point on the circumference adjacent to the sharp end of the long diamond inner metal bushing, which should be "up", so the bushing goes in properly oriented. Despite what the service manual says, there was no orientation mark on the bushing, so this is how I made my own. I did this by filing a notch in the edge of the bushing. Marking with a sharpie did not work because the ink got washed away by any rubbing or oil in the area.

    7. The 360 and 430 bushings were the same width, so I re-used the washers on either side of the original 360 bushing.

    8. As you approach pressing the bushing into a centered position it is not obvious when to stop. Therefore you should prepare by measuring the bushing width and the casting width so you can determine when the bushing is centered and there is equal clearance on each side.
    Image Unavailable, Please Login
     
  5. FerrariDublin

    FerrariDublin F1 Rookie

    Jun 14, 2009
    3,446
    Dublin, Ireland
    Full Name:
    Greg
    Nice write-up Alan and well done for taking on the job yourself.
     
  6. Fatty

    Fatty Karting

    Jun 5, 2010
    236
    Australia
    Digging up this ancient thread, just wanting to thank FerrariDublin for the instructions. Helped me greatly yesterday, as I had to replace a crumbled gearbox bush. :D
     
  7. To remove this ad click here.

  8. 360+Volt=Prius

    360+Volt=Prius Formula 3
    Silver Subscribed

    Sep 1, 2013
    1,414
    Western Mass
    Full Name:
    Raimondo
    Thanks Greg.

    Has anyone considered a ball joint press? is there just not enough clearance for even a large SUV press.
     
  9. c928jon

    c928jon Rookie

    May 25, 2010
    18
    Thanks for a great write up, still helping people years down the line.

    I did mine yesterday, to while away some social distancing time. I’d picked up a pull/push kit from eBay for £80 that had a variety of bearing and bush adapters. It worked a charm on in and out.

    The lead bevel on my bush wasn’t square, no fiddling in the world would have got it going in straight. I span it on the bench grinder to square the taper and it went in fine. It was tough work pulling them out and in.

    On the test drive, no more clunk when dropping down off a speed bump and much easier shifting (manual) everything seems much more aligned. I guess it must be as my exhaust tips are sitting 20mm higher than before.
     
  10. knocker

    knocker F1 Veteran

    Jul 10, 2017
    7,850
    Sydney Aus
    Full Name:
    Adrian
    #33 knocker, Apr 15, 2020
    Last edited: Apr 15, 2020
    I'm just having mine done as part of the annual service and my mechanics taking the silver cradle out to do the job, how many hours is your shortcut method taking by the way ?
     

Share This Page