Sunbeam S7 Deluxe

  1. awemawson Forum Supporter

    I remember them as a copper sandwich. Thin copper either side with something else between and swaged over round the openings but it’s a long time since I had one apart.
     
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  2. Farside

    Farside Badly Welded Man

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  3. ronan

    ronan Forum Supporter

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    dublin
    I was dealing with them, buying bits for the 650, and they said they were closing for a while as they were moving to a new place. Trouble is they don't have a website and it makes it a bit of a pain dealing with them. I also use Draganfly in Bungay in Suffolk.
     
  4. ronan

    ronan Forum Supporter

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    The BSA Goldstar had a "peelable" gasket, you could peel off layers of copper to get the head to sit right on the barrel.
     
  5. slim_boy_fat

    slim_boy_fat Forum Supporter

  6. 8ob

    8ob Forum Supporter

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    Annealed the copper gasket?

    I have always drilled/punched holes in gaskets prior to cutting shapes, sods law its going to break out that close to an edge.

    Bob
     
  7. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

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    East Yorkshire
    Striped the oil pump, there’s pitting from rust, other than that looks to be good.
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  8. ronan

    ronan Forum Supporter

    Messages:
    9,267
    dublin

    Looks like the BSA oilpump, is the housing made out of zinc by any chance ?
     
  9. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

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    Location:
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    No its part if the back plate/bearing housing.

    Boy, I’m I glad I stripped this engine, I reckon it would have ended in a very unhappy bunny if I’d continued to use it.

    Make shift pusher
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    Front bearing is goosed,
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    back main is the same.:(.
    289C16CD-4837-4F31-9307-9A16B23CF620.jpeg .
     
  10. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
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    Location:
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    Looks like the front bearing is the epicentre, [doesn't show in the picture] the surface has flaked like its plated. Even worse its debris reached the rear white metal main. Replacement bearings are eye wateringly expensive. Hopefully I can get it sleeved and the bearing opened up to suit.
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    Not what I had on Santas list :(
     
  11. ronan

    ronan Forum Supporter

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    dublin
    I know white metal bearings are prefered, but i think like the BSA A7/A10 twins, which have a roller on the drive side of the crank and a white metal bush on the other, you can get away with a bronze bearing. I am not familiar with the Sunbeams though, does the oil feed to the big ends pass through the white metal bearing ?
     
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  12. Was it Devimead who used to do a needle roller bearing conversion for BSA's? Eliminated that timing side bush and the centrifuge problem with the oil by adding an end feed to the crank. Seemed like a good idea, but I didn't know about it until after I'd blown up a girlfriends MkII Spitfire on the M69!
     
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  13. Rannsachair

    Rannsachair Forum Supporter

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    Lochgilphead, Argyll, Scotland
    Yes, see http://www.srmclassicbikes.com/devimead

    Bad news about the bearing, though good it has been caught, so you can sort it properly. You will have great confidence in the bike when it's done.

    You have probably seen it but looks like some good information on Sunbeams on http://www.sunbeam-twins.com/putting-the-engine-together.html
     
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  14. dobbslc

    dobbslc Forum Supporter

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    At Kempton last weekend I saw this and thought of you,
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    S8? I think it was up for £3000.
    I also saw these but can't remember what the sellers name was :doh:
    IMAG1455.jpg
    Good luck with the engine.
     
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  15. earthman Member

    Messages:
    1,096
    I agree with you but I'm not sure if I could be bothered or talented enough to make one so I take my hat off to you.
     
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  16. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

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    Location:
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    Thanks guys, I’m calling the machine shop today also Stewart Engineering. I’ll look at all the possible solutions.
    @dobbslc thats the S8, worth a lot less than the S7Delux, and optimistic at that price in that condition. Thanks for the links, I’ve had the link to sunbeam-twins for a while, along with Sunbeam R&R, both useful
     
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  17. Seadog

    Seadog Forum Supporter

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    NE London - UK

    Maybe on the ZA7, but all later ones ones had a steel bush with bronze sleeve.
     
  18. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
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    Location:
    East Yorkshire
    All that glitters is not gold, a quick squirt of brake cleaner and the rag is covered in tiny slivers
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    Well pitted. A common problem if the dynamo seal is left out.
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    I’m feeling hopeful for the rear white bearing, the side that looks like its picked up has been scraped for oil relief.
    B699BBD9-A36E-4911-A648-31FD5A4E412A.jpeg

    I dont want to replace it if possible, replacement is north of 220quid:o.
    Its off to Stanwood Engineering in the morning:sheep:
     
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  19. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
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    Location:
    East Yorkshire
    The front bearing came off quite easily thankfully as there’s a shim behind that set the end float. Just need to locite the bearing on once I have it set.
     
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  20. ronan

    ronan Forum Supporter

    Messages:
    9,267
    dublin
    Nope, all the A series twins had a three piece steel backed white metal bush or plain bearing. They were actually very good if you kept the oil clean, but of course many didn't out of poverty or laziness. The supply of original bearings dried up and people started using solid bronze bushes. They can work, or they cannot.
     
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