Sunbeam S7 Deluxe

  1. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    13,785
    Location:
    East Yorkshire
    Under normal use I’m sure they dont, unfortunately its all too easy to get struck in traffic for long periods these days. Also it increases reserve by a 1tr. Did yours leak/burn much oil
     
  2. awemawson Forum Supporter

    Oil consumption was modest as I recall. The first one was my daily driver when I lived i Southampton, indeed I remember being wiped out by a car that pulled out of a driveway opposite 'The Dell' (I think Southampton FC have moved from there now?). It sheared my near side foot rest completely off but amazingly my foot survived ! Driver learnt a few new words I think !
     
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  3. Gritineye Forum Supporter

    Messages:
    994
    Sussex UK
    They had a bad rep for big ends not lasting long after a rebuild.

    That's because they have a hollow galley in the cranks throws that act as a centrifugal oil filter, which wasn't widely known about.

    These need cleaning out every so often due to a build up of sludge, which can build up till it is half full with hard sludge and block off the oil holes to the BE bearing.

    A wire can be pushed in which will feel like it's clear but it ain't, the screwed in end caps need removing to clear the galleries out.
     
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  4. awemawson Forum Supporter

    My regrinds were done by Stewart’s when they were in Putney, and they did the oil gallery clear out for me, very handy as I happened to be living on the Kings Road Chelsea at the time so it was just over Putney Bridge. The Stewart’s were a very kind couple, I remember Mrs Stewart had a fine head of blonde hair, a splendid sight as she rode up on a machine. Pre credit cards I remember her teasing me as I ordered bits to be sent up country for my round the coast expedition, and trusting me to pay on my return. Not many places would do that nowadays!
     
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  5. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    13,785
    Location:
    East Yorkshire
    Ive read this elsewhere can it be done with the crank in situ, engine in the frame?
     
  6. Gritineye Forum Supporter

    Messages:
    994
    Sussex UK
    No I don't think it can be, memory is a tad hazy..
     
  7. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    13,785
    Location:
    East Yorkshire
    I dont think oil pressure is a problem, it certainly gets to the cam cover, as it pushes it out head gasket around the cam chain gallery :laughing:
     
  8. Gritineye Forum Supporter

    Messages:
    994
    Sussex UK
    The oil pressure isn't the problem, it's the restricted flow to the big ends because the holes can become blocked.

    Sorry if this is now a worry to you but it's like when I bought a '28 Chevy engine which was all painted up (even inside!) but when I checked most of the oil troughs and galleries were blocked with solid sludge. It wouldn't have run for long..

    Non detergent oil does that if left standing long enough.
     
  9. ronan

    ronan Forum Supporter

    Messages:
    9,065
    dublin
    Anyone watch "Junk and disorderly" on the box tonight ? That double engined sunbeam was being ridden around an autojumble by Sam Lovegrove. Very long looking thing. Sad to see the British Motorcycle Museum in west London is closing down and selling off their exhibits.
     
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  10. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    13,785
    Location:
    East Yorkshire
    Yes, nearly jumped off the sofa:laughing:
     
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  11. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    13,785
    Location:
    East Yorkshire
    After welding up the sump plug hole it warped the casting in the corner for about 3" requiring attention; if I ever wanted it to be oil tight. Just a dry fit at the moment, oil strainer cage needs dropping, oil pickup needs lengthening.

    D628BAB6-0A3E-4C70-B205-8BDBE0517322.jpeg
    image.jpg

    While the sump was off, I could see the bores, and unfortunately it looked like they were scored.:(
    The head needs to come off to replace the leaking composite gasket, so that was the next job.

    Rocker cover is also warped so that got a rub down. It also doesnt lineup with the head, as the holes are out of alinement, they arent flat either. So Ill weld them up and mill new holes in the correct place

    6FD54D48-6752-43B6-97C3-A5FE46B256ED.jpeg

    Cam looks in good nick, rocker faces are fine, valve caps need replacing.

    97DA9B53-999F-4935-9BE3-C488FD6BFB58.jpeg
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    The head is held down with 11 bolts, two of which are behind the camchain cover.
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    Good old British engineering:laughing:

    Head came off very easily, a bit of coking
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    A shiney bit of sheet to make a new gasket

    C080A709-6948-4911-8425-E727F3B9C50A.jpeg
     
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  12. octo0072000

    octo0072000 Member

    Messages:
    5,244
    Location:
    south yorks
    looks like someone's been in there with the old red Hermetite Dave
    upload_2019-11-23_11-27-45.jpeg
     
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  13. ronan

    ronan Forum Supporter

    Messages:
    9,065
    dublin
    You going to have it rebored ? Are the cylinders separate to the crankcase or are they all one piece like modern bikes ?
     
    sg66 likes this.
  14. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    13,785
    Location:
    East Yorkshire
    Looking down the bores they show signs of tarnish and a few vertical scores. Nether are bad enough to warrant a rebore. I’ll take the pistons out and check the rings, go from there.

    Took the valves out seats look fine, exhausts need a lap. Rear inlet valve has a little guide/stem wear.
    image.jpg
     
  15. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    13,785
    Location:
    East Yorkshire
    Looks a bit better.
    611D918C-C200-4EC4-ADA2-393BAA4F49FD.jpeg
    Valves ground in quickly.
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    Back pot looks to have sat with water, or the plug out. I also found a crack in the web between the valve and cam chambers. I’m not worried it looks like a cooling crack after casting
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    the head is flat enough
    8A3E4E01-FA62-4DA6-97AB-D2402CE05F5B.jpeg
    You can see the pitting in the back pot now, not that bad.
    Template started
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  16. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    13,785
    Location:
    East Yorkshire
    I’m temped to clean the pitting up to totally remove the carbon and the peen the surface. Otherwise deposits may quickly adhere to the head
     
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  17. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    13,785
    Location:
    East Yorkshire
    I’d forgotten how much I hate fret saws.:laughing:
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  18. ronan

    ronan Forum Supporter

    Messages:
    9,065
    dublin
    Would you not save yourself the hassle and order a gasket off Draganfly or whoever sells Sunbeam bits
     
  19. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    13,785
    Location:
    East Yorkshire
    That cost me £9.79. To buy one is £69. Took me 30mins

    Besides no pain, no gain:artist:
     
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  20. ronan

    ronan Forum Supporter

    Messages:
    9,065
    dublin

    70 sheets for a gasket ! I've just got a nosebleed !
     
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