Click here to sign up  Click here to go to the galleries  Click here to go to the code of conduct  Click here to go to the video page  Click here to go to the SW Meets page

Thread: Banging/vibration underneath - could it be propshaft/gearbox?

Page 1 of 2 1 2 LastLast
Results 1 to 10 of 13
  1. #1 Banging/vibration underneath - could it be propshaft/gearbox? 
    frequent forum contributor
    Join Date
    Nov 2011
    Posts
    391
    Hi all
    Sorry to have totted up 4 enquiries in as many weeks, but I am gradually trying to resolve all kinds of unknowns with my 'new' Berlinetta (2 litre Cortina, 1992 vintage)

    Driving on bumpy roads, especially those with a corrugated surface or lots of potholes, I experience a solid thumping noise around the gearbox area, accompanied by the gear-lever wobbling fairly violently.

    At first, I thought it might be the exhaust pipe hitting the underside of the body, especially when the rear pipe starting fracturing away from the silencer. Long-story-short, I've fixed all of that, and the exhaust is now held in place (with fibre straps & clamps) in 3 places instead of the original 1.

    As the banging is so solid, and in the centre of the car, I am now inclined to think either the gearbox or propshaft is dancing about in sympathy with the road defects.

    Has anybody experienced this before? Could the gearbox/engine mountings be like marshmellow? Is this a Berlinetta quirk, with a tried/tested remedy? I would be obliged for any advice.

    Cheers
    Mike G
    Reply With Quote  
     

  2. #2 Re: Banging/vibration underneath - could it be propshaft/gearbox? 
    frequent forum contributor Club Member Dane_Rescueman's Avatar
    Join Date
    Nov 2011
    Location
    North Kernow cliff dweller
    Posts
    810
    Hi,
    I have had gearbox & engine mounts become bath sponges. I replaced the lot. The gearbox rubber becomes detached along it's edges with the metal surround. This is hidden by grime etc. There is not much clearance for the gearbox in the tunnel so any untoward movement can cause contact with the tunnel, or, the small 40mm square chassis member.

    With the aid of a trolley jack, it takes no time at all to replace the mounts
    Reply With Quote  
     

  3. #3 Re: Banging/vibration underneath - could it be propshaft/gearbox? 
    frequent forum contributor Club Member
    Join Date
    Nov 2011
    Posts
    938
    Okay the Berly had two sizes of tunnel. Early cars had the widest. The tunnel was narrowed to help with wider seats. The prop can hit, also the turning motion on the back axle can cause it to hit as well. The hand brake linkage can clash as well. and as Dane says the condition of the mounts is very important. You need to examine very closely and you can usually see where contact has happened. Good Luck you will get there with it all.
    Reply With Quote  
     

  4. #4 Re: Banging/vibration underneath - could it be propshaft/gearbox? 
    frequent forum contributor Club Member Dane_Rescueman's Avatar
    Join Date
    Nov 2011
    Location
    North Kernow cliff dweller
    Posts
    810
    Ah, I forgot about the later mods. I have an older Berli with wide tunnel and baby seats!
    Reply With Quote  
     

  5. #5 Re: Banging/vibration underneath - could it be propshaft/gearbox? 
    frequent forum contributor
    Join Date
    Nov 2011
    Posts
    391
    Thanks guys for your ideas. Spongy mounts was sort of in the recesses of my brain.
    Next question is what's the best source for new mounts - Ford or a.n.other?
    Cheers
    Mike G
    Reply With Quote  
     

  6. #6 Re: Banging/vibration underneath - could it be propshaft/gearbox? 
    frequent forum contributor
    Join Date
    Nov 2011
    Posts
    104
    Hi Mike

    Look inside your tunnel on the side with the handbrake mech.
    If the gearbox is mounted in the middle of the tunnel this is what it will hit.The mount has a long hole for sideways movement Our Editor had the same thing(gearbox hitting tunnel)
    Reply With Quote  
     

  7. #7 Re: Banging/vibration underneath - could it be propshaft/gearbox? 
    frequent forum contributor
    Join Date
    Nov 2011
    Posts
    2,034
    Message originally posted by: Sue Roedel (MOC Editor)
    And I also changed all the rubber bushes for nylon ones as I had Le Clonk at the back of the car which was the axle banging around on every bump. Yours sounds more gearbox than bushes but if you are getting Le Clonk then do the bushes next. Drove me potty for ages!

    I also have Le Slapp which is the handbrake cable whallopping the underside of the car sometimes if I go over a bump at a particular speed/angle. All good fun when you have someone new in the car. The look of terror in their eyes is quite amusing!

    Still waiting for my new wheels to arrive...
    Reply With Quote  
     

  8. #8 Re: Banging/vibration underneath - could it be propshaft/gearbox? 
    frequent forum contributor
    Join Date
    Nov 2011
    Posts
    2,034
    Message originally posted by: Anita
    Slapp ! Our editor? Surely not!
    Reply With Quote  
     

  9. #9 Re: Banging/vibration underneath - could it be propshaft/gearbox? 
    frequent forum contributor
    Join Date
    Nov 2011
    Posts
    2,034
    Message originally posted by: Sue Roedel (MOC Editor)
    Oh, Slapp Off Anita!
    Reply With Quote  
     

  10. #10 Re: Banging/vibration underneath - could it be propshaft/gearbox? 
    CABRIOBOB's Avatar
    Join Date
    Nov 2011
    Posts
    464
    Sue
    Le slapp is caused by to much Le slack so keep it Le tight.
    Reply With Quote  
     

Similar Threads

  1. Propshaft for gearbox swap
    By chrislibby in forum Roadster
    Replies: 17
    Last Post: 16-02-2019, 02:24 PM
  2. Project for someone - YKC underneath !
    By dcunn in forum SALES:
    Replies: 4
    Last Post: 07-07-2017, 10:55 AM
  3. Engine/bodywork vibration
    By gouldsborough7 in forum Cabrio / Hunter
    Replies: 9
    Last Post: 26-09-2011, 09:43 PM
  4. Vibration/judder on braking - any ideas?
    By andy-rogers in forum General Discussion
    Replies: 20
    Last Post: 28-08-2010, 08:08 AM
  5. steering vibration
    By dogoncrazy in forum Cabrio / Hunter
    Replies: 1
    Last Post: 19-09-2005, 07:00 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •