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Thread: Selectro freewheel hub assembly

  1. #1
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    Selectro freewheel hub assembly

    I've just stripped, cleaned & checked a pair of Selectro freewheel hubs.

    The worst part was cleaning off HMP grease and dirt, the two main parts were then cleaned and painted. Next replacement O-rings were sourced from a local O-ring supplier, now for assembly.

    Parts cleaned & painted.
    DSCN4445 by Colin Radley, on Flickr

    I had to Loctite the bushes in these parts. The bushes were loose allowing movement and the aluminium housing was worn (groove behind the bush). Should be OK now the bush is held in place.
    DSCN4453 by Colin Radley, on Flickr

    Grease the inside of the cap, grease the spring and put the small diameter end in first.
    DSCN4455 by Colin Radley, on Flickr

    Next insert this part.
    DSCN4456 by Colin Radley, on Flickr

    This is the cam that engages or disengages drive.
    DSCN4457 by Colin Radley, on Flickr

    Grease & insert the cam.
    DSCN4458 by Colin Radley, on Flickr

    Now the tricky bit.....push the parts down into the cap against the spring (after lining up the screw holes in the cam). Three screws have to be inserted into the holes to hold the cam in place, might take a couple of attempts.
    Selectro 6 by Colin Radley, on Flickr

    Now assemble these parts.
    Selectro 2 by Colin Radley, on Flickr

    Press into the hub and fit the circlip.
    Selectro 3 by Colin Radley, on Flickr

    Be careful with the circlip above. When taking it out it can travel some distance if you're not careful !

    Put the O-ring into the narrow groove.
    Selectro 4 by Colin Radley, on Flickr

    Make sure the O-ring is lubricated with grease. Push the cap over the main section of the hub and insert the screws shown (3) to hold it in place. The screws locate in the wide groove.
    Selectro 5 by Colin Radley, on Flickr

    When stripped the hubs were packed full of grease. When I assembled them I just used a paintbrush to apply grease to every surface as I put it together.

    O-ring is BS-037 N70 try your local O-ring supplier or I can source them.

    To fit back to the front hubs you have to take off the endcap (3 screws). Fit a gasket to the hub, slip the driveshaft through the centre section, install the 5 hub bolts then fit the washer & castle nut to the end of the driveshaft. Install a new splitpin, apply some grease to the nut and then re-fit the outer cap of the freewheel hub (3 screws).

    Now decide whether to leave it engaged or disengaged.

    Just found some exploded views on the Interweb. Not branded Selectro and the second one is for a different vehicle. Second picture shows some 'special' washers for the hub bolts, I wondered what the raised pips were for each side of the hub bolt holes.....

    Selectro diagram by Colin Radley, on Flickr


    Colin
    Last edited by gromit; 8th August 2017 at 06:51 PM. Reason: O-ring info added, diagram added
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '58 Series II (sold)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

  2. #2
    Johnno_p Guest
    Great write up. Thanks Selectro freewheel hub assembly

  3. #3
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    Wow that was a quick turn around with the post. It is very informative, thankyou. Now I just have to plan when I'm going to tackle the job.

    Thanks again
    Nathan.

  4. #4
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    Great write-up
    Where did you since the o rings from. Of the shelf, bearing shop ?
    What grease would you recommend ?

    Whitehillbilly

  5. #5
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    Quote Originally Posted by whitehillbilly64 View Post
    Great write-up
    Where did you since the o rings from. Of the shelf, bearing shop ?
    What grease would you recommend ?

    Whitehillbilly
    I took the parts into an O-ring shop and they determined the correct size. Also took in the original O-ring but from experience they prefer to measure the parts rather than an old crumbly O-ring.

    Just used high melting point bearing grease.

    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '58 Series II (sold)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

  6. #6
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    Thanks.
    O ring part no, sizing on receipt by any chance.

    whitehillbilly

  7. #7
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    Quote Originally Posted by whitehillbilly64 View Post
    Thanks.
    O ring part no, sizing on receipt by any chance.

    whitehillbilly
    No receipt when you pay cash

    I think I have the number.


    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '58 Series II (sold)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

  8. #8
    Join Date
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    Once The o ring sizes have been added to your above post, the rebuild part of the post,
    Maybe made into a, Free Wheeling hubs 'sticky'

    whitehillbilly

  9. #9
    Johnno_p Guest
    Quote Originally Posted by gromit View Post
    The worst part was cleaning off HMP grease and dirt, the two main parts were then cleaned and painted.
    What did you use to clean it up with?

  10. #10
    Join Date
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    Scraped out a lot of the grease & dirt then degreased with mineral turps.

    Most of the black paint had worn off so wire brushed to remove dirt & corrosion followed by a light sand with fine emery paper. Then degreased with metho and after masking off a quick paint with rattle can black epoxy paint.

    Then some emery paper on a flat surface to sand off the paint on the logo/instructions.


    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '58 Series II (sold)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

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