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Thread: Differential Pinion Seal Help needed

  1. #1
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    Differential Pinion Seal Help needed

    Gentlemen,
    I need some help in my useless attempts to change the piñion seals in both front and rear Diffs on my 1953 Series 1 80".

    My front Diff is numbered 36110174 and the rear is 36118950.

    I ordered new seals online, (although I had some spares anyway, following their instructions and received two Corteco Seals part number FRC4586 A.

    I trashed both new seals trying to install them. They were super tight and distorted when I tried to driver them in. I used my back-up seals and eventually got them in without distortion after much effort. To my dismay, when I reinstalled the drive Flange, the seals were clearly wrong and the drive flange was several millimetres way from the seal's lips and would never see in the oil.
    So i've wasted a day, trashed $50 worth of seals and have to start over again.
    So I hope someone can tell me what I did wrong and what Seals should I have ordered?

    The parts manual talks about semi-floating and Fully floating, i have no idea what this means and which I have in my S1 80.
    The parts manual also states that the Pinion seal is part number 217507 for both types and the same front and rear.

    Could a suitable Oil seal be found Locally or only from the UK?

    Can someone let me knoemthe correct part number that I need to order?

    Lastly, I assume that my Differentials are Rover Type, not Salisbury type?

    regards and thanks
    Jeff

  2. #2
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    I checked the CBC bearing book and early series 1 have a different seal to late series one. I suggest looking at John Craddocks website , he may have more info on which seal fits what and an interchange from the part numbers that you already have.

    Ian
    Bittern

  3. #3
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    I believe the seal changed in Aug 49 when the long-nose diff was replaced by the now familiar Series diff.
    .W.

  4. #4
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
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    An alternative approach would be to take the bearing/seal retainer and the drive flange to a local bearing supply company. It is likely that they have or can order in a correct seal.

    Bear in mind that it is quite possible that the differential is no longer the one originally fitted - any Series diff except a Salisbury is interchangeable except the One Ton (and there are almost certainly none of these here) or some FC ones.

    If you have the Rover part number, some bearing suppliers can cross reference this, but note the caution above.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  5. #5
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    G'day Jeff,

    This is what I do when confused over P/N's for oil seals.
    Measure accurately ( calipers are accurate enough) the seal housing inside diameter and it depth to the shoulder. Also the flange seal area diameter. Go to a bearing shop and give them these "housing and shaft" measurements. They will be able to give you the correct seal that will fit.
    You have a choice of Nitrile or Viton rubber. Viton is 5 times more expensive however, resists going hard when used with Sulphur based EP oil.

    Good luck!
    Chris

  6. #6
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    I have always just taken the old seal , flange & O/S dimension by measuring were it fits in the diff, to CBC & bought them there . I have had 3 X S1's & replaced the seals in all 3 without a problem. I usually also fit speedy sleeves while I am at it just to be on the safe side.

  7. #7
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    For those who may be interested, theNational Seal 410183-N has thecorrect1-3/4” x 2-3/4” x ½”dimensionsare a good quality Pinion seal at $15.00ea + GST.regards
    Jeff

    1 x National Seal 410183-N $15.00ea + GST.
    1-3/4” x 2-3/4” x ½”

  8. #8
    cjc_td5's Avatar
    cjc_td5 is offline ChatterBox Silver Subscriber
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    Quote Originally Posted by JDNSW View Post
    An alternative approach would be to take the bearing/seal retainer and the drive flange to a local bearing supply company. It is likely that they have or can order in a correct seal.

    Bear in mind that it is quite possible that the differential is no longer the one originally fitted - any Series diff except a Salisbury is interchangeable except the One Ton (and there are almost certainly none of these here) or some FC ones.

    If you have the Rover part number, some bearing suppliers can cross reference this, but note the caution above.
    Fully agree with John here. Just take your old (however trashed) seal to a bearing supplier (Statewide Bearings or similar) and they will measure it up and find you a replacement. In Bunbury it is usually off the shelf and quite reasonably priced.

    Chris
    Chris


    2014 D4 TDV6
    1954 86"
    1963 2A Forward Control (getting the full treatment, Isuzu 4JH1, MYY5T, LT230, Toyota Axles, extended cab ++)
    1980 Stage 1 v8 (gone)

  9. #9
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    Yes, that is exactly when I did in the end. The guys at StateWide Bearings were super helpful and after inspecting the running surface on the drive flange, suggested Speedy Sleeves as well. I came away very happy but still a bit upset that a number of "respected" LR parts dealers are selling seals that are clearly incorrect. I must be the only person to discover this.

    cheers
    Jeff

  10. #10
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    Quote Originally Posted by jedwards View Post
    Yes, that is exactly when I did in the end. The guys at StateWide Bearings were super helpful and after inspecting the running surface on the drive flange, suggested Speedy Sleeves as well. I came away very happy but still a bit upset that a number of "respected" LR parts dealers are selling seals that are clearly incorrect. I must be the only person to discover this.

    cheers
    Jeff
    Jeff,

    I am glad you got sorted locally. In future take you worn bearing, bush, seal etc. to your local supplier. Also, be careful what oils you put in your transmission. Many modern gear oil EP additives attack copper allloys. Rover used lots of bronze bushes, so make sure you only use copper alloy (yellow metal) compatible gear oils in your diffs, transfer case, gear box, swivel/tracta housings and steering box.
    Penrite mineral gear oils use suitable additives in most of their gear oils. Check the label!

    5380

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