+ Reply to Thread
Results 1 to 3 of 3

Hybrid View

  1. #1
    Registered Member
    Location
    , ,
    Member No: 15151 Maximusagnew is an unknown quantity at this point Maximusagnew's Avatar
    Join Date
    Oct 2001
    Posts
    4
    Rep Power
    0


    Yes | No

    rear differential leaking

    hello,
    Gotta leaky differential problem in my '70 2800cs. I bought the car about a month ago and it had been leaking just a few drops in the garage. After a 150 mile trip to the city this past weekend, the diff seemed to leak more so I decided to inspect. I checked the level and it was real low so I changed the oil and added new washers on the drain plug bolts. The oil was so low only 1/2 quart was drained when changed. It was very dark colored and had a burnt smell to it. Hopefully there is no serious damage to the differential resulting from low oil. It never seemed to make any bad sounds, however oil is all over the rear muffler and drive shafts.

    After a de-greasing job I think I found the leak. It seems to be where the propeller shaft attaches to the diff. I know it is a pain in the [Oops!] to change the seal in there from reading the repair manual. Also, the previous owner changed the seal already. He told me that it might be leaking from the top of the differential from the venting tube, although he admits that he might be thinking about his Porsche differential he had worked on. I think it might be leaking from both places since there it lots of oil on top.


    My diff is the original one that came with the 2800cs (3.45). The car now has a 85 535i engine and transmission. So my question is: take out the differential and repair the seal myself or find one to replace? Considering that the previous owner had already replaced the seal and it might be on the verge of failing, I think it might be time for a new one. What ratio would work best with the 5 series engine and transmission? Thanks for your help.
    -Max

  2. #2
    shermanmartinez
    Guest
    Location
    , ,
    Member No: shermanmartinez's Avatar


    Yes | No

    Re: rear differential leaking

    535i models used a 3.25 ratio standard. 535i owners often change the gearing to a 3.46, 3.64, or 3.73 ratio for better acceleration. The sideloader differential that the CS models used is limited in terms of ratio choices. You have 3.07, 3.25, 3.45, 3.64, and 4.10 as choices but finding them is another game altogether. The 3.45 is the most common with 3.64 as the next most likely available. The rest are much more difficult to source.
    [email protected]

  3. #3
    Registered Member
    Location
    Little Rock, AR, United States
    Member No: 77975 clydeg is an unknown quantity at this point clydeg's Avatar
    Join Date
    Jun 2003
    Posts
    28
    Rep Power
    0


    Yes | No

    Re: rear differential leaking

    Hey, Max, I have been in contact wit a man in Belgium wha has a close ratio 5 speed for a big six engine. If you are interested, I will forward his internet address to you.ClydeG R 2 4
    |-|-|
    1 3 5

+ Reply to Thread


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Bookmarks

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
1e2 Forum