R180 diff stripdown | The Z Club of Great Britain

R180 diff stripdown

Discussion in 'S30 (240Z,260Z,280Z) Drivetrain' started by johnymd, Aug 9, 2017.

  1. johnymd

    johnymd Active Forum User

    I have an R180 and need to remove the quaife from it to go in another diff. I have stripped the R200 before, which is really easy, but I'm struggling to get the diff out of the R180 case. It just doesn't seam to fit out of the back. The side covers are removed and I've taken one of the side bearings off to give me more room the turn the unit but there just doesn't seam to be enough space for the unit to come out!! Please help as I'm now considering cutting the case in half with a grinder.
  2. pmac

    pmac Active Forum User

    Good idea.
    I have three 180 diffs here that I will end up cutting in to pieces.
  3. franky

    franky Active Forum User

    As a side thought, if you've got the diff in there, all the metal flying about from an angle grinder won't do it many favours:eek:
  4. Pete

    Pete Forum User

    Any of them in decent working condition with a 3.9 ratio?
  5. pmac

    pmac Active Forum User

  6. johnymd

    johnymd Active Forum User

    I was joking about the grinder :)

    It must come out but I'm just struggling to work out what I'm doing wrong.
  7. pmac

    pmac Active Forum User

    Im not.Im serious.
    Mine will get chopped up if not sold soon. That nice man in Ilkeston will chop them up for me...........

  8. johnymd

    johnymd Active Forum User

    I notice you have a 3.3 for sale but do you have any other ratio's?
  9. pmac

    pmac Active Forum User

    I will answer your question with a question...........why do you think I have only listed one ratio in an advert selling R180 diffs?????

    I know its a difficult one .... :rolleyes:
  10. Mark N

    Mark N
    Z Club Member

    It looks pretty tight in the drawing and the service manual says "Extract differential case from carrier using slide hammer".
    So I would guess that means pull it straight back!
  11. johnymd

    johnymd Active Forum User

    Thanks Mark. The diff is wider than the rear opening so I'm guessing it must turn in order for it to come out. It will turn to the point where it very nearly comes out then runs out of room. On the R200 you just remove the 2 caps and the diff just comes out of the back. The R180 is a totally different design and the unit is held in place by 2 side plates. Once these are removed the diff is free to move around.

    Attached Files:

  12. Mark N

    Mark N
    Z Club Member

    That is an excerpt from the manual regarding the R180 not the R200 which seems to be a simpler affair.
    I don't know if you have a copy of the FSM handy to look at the drawing.
    If you can pull that bearing in the photo then swing it back in to its original position it looks like it will come out straight back (with some persuasion).
  13. johnymd

    johnymd Active Forum User

    That s my next option but having recently seen a R180 stripped and the bearings still on the diff unit I'm convinced it will come out with them on.

    I don't have the FSM.
  14. tel240z

    Z Club Member

    I would be more worried about getting it back in
  15. Mark N

    Mark N
    Z Club Member

    I have a hard copy for my 260Z but section on the R180 diff is pretty much the same as the 78 280Z FSM here:

  16. johnymd

    johnymd Active Forum User

    Quaife will be fitting it to my R180. Just need to get it out of this scrap one.
  17. johnymd

    johnymd Active Forum User

    Just downloaded the FSM and unfortunately it doesn't help in how to remove the carrier. It mentions using a puller to get the side plates off, which was easy with just a screwdriver, but only say "Extract differential case from carrier". As it doesn't mention any issues with doing so and looking at the shape of the original diff section, I can only assume the issue may be that the Quaife is larger than the old diff and has to be split before it comes out of the body. I did try to split it by removing the allen bolts but they wouldn't budge. Even with an impact wrench.
  18. johnymd

    johnymd Active Forum User

    Just spoken to Quaife who confirm that the unit should come out in one piece but it is very very tight in the body and may require some persuasion.
  19. Rob Gaskin

    Rob Gaskin Membership Secretary

    John, I suggest you try 'gas and air' and give another push!

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