Back Axle Oct 1938/39

The Club Forums Gearbox / Transmission Back Axle Oct 1938/39

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  • #25034

    Dennis Nicholas
    Participant

    Subject – torque tube ball end felt seal and its housing. (for my 1938/39 rear axle).
    Items shown in spares list 1586 (Oct 1937) as – Housing = 1A7640  Felt 2K5560. This appears to be standard to all torque tubes after at least 1936 including being shown on the Big Seven spares list 1598A and B.

    Front being the front of the car:- Where does it fit at the ball end of the torque tube?
    1. I presume that it fits behind the front ball bearing? .
    2. With felt in front of housing next to the bearing?
    3. How is it actually held in place?

    or is it just behind the pinion shaft prop-shaft flange with the felt around the backward facing spigot
    4. Is there a modern lip seal that replaces it?
    5. what is its actual job?
    John Platts Austin Seven Centre spares list has felt seal for 1939 pinion 2K5560 But no illustration showing for 1939 and it is not shown in their earlier axle illustrations!
    Any pictures of the assembly exploded….?  I am using a ball bearing with seal on forward side but not on rear side.

    6.  The breather plug…..is that on top of the torque tube or does tube rotation fit so that it is underneath?
      Bizarrely the breather is listed with the back axle under “axle case with nearside tube and end” rather than with torque tube…part 1G7042 air vent plug.
    It is actually shown in the Austin Seven Centre John Platts spare parts catalogue…item 47 -1G7042.

    It is unfortunate that the late 1938 to 1939 axle is totally ignored in all the books I have on A7 (Bill Williams special builders guide, 750 club special builders guide, 750 club “companion”  It is rather a long time since I stripped the axle and any way I think the pinion seal was wrong or missing altogether.

    Finally….what is the best way to ensure front pinion bearing is kept lubricated?

    #25074

    Tony
    Participant

    Use high-temp lithium grease like Mag 1 Wheel Bearing Grease or gear oil to lubricate your bearings.

    #25081

    Dennis Nicholas
    Participant

    Thanks Tony……believe that would be a waterproof grease??.
    I am actually intending to use a grease with AFMT (Anti Friction Metal Treatment) in it. AFMT developed by PROLONG in the USA…..now Synionic in this country and marketed by Silverline.
    Tis genuine stuff as shown by independent lab tests including MIRAS lab report – to be added to any oil and premixed in tubes of grease from supplier- . I have been using it in my Scimitars for a few years and now also in my Yeti.

    #25082

    Dennis Nicholas
    Participant

    I am still none the wiser as to what the torque tube ball end felt seal and its holder look like or where it was located and how held in position. However have been told it is not necessary as it was to stop axle oil leaking out the front and if a bearing with a seal on one side is used that will perform the same function.

    #25093

    Dave Waller
    Keymaster

    Just been looking through the postings and hope you have sorted out your problems but a very useful book is the Austin Seven Manual by Doug Woodrow, Available from Mercury Vintage Publications. Not cheap but it is a big book and worth its weight in gold. Buy new as for some reason trying to buy from eBay people pay over the odds thinking it is out of print, which it isn’t.
    The late 38 -39 axle has bigger bearings and a heavier half shaft. If the problem is oil leaking past the seals onto the brakes get sealed for life bearings and modern lip seals.
    Details for the Manual are:-
    MERCURY VINTAGE SERVICES
    Address: Rosedale, Station Road, Emneth, Cambs PE14 8DL
    Phone: 01945 430058
    Email: susan.woodrow@gmail.com
    Products: Austin Seven Workshop Manual, Handbook and Parts Lists reprints, Castrol Lubrication Charts and Restoration.

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