Machining Flywheels

Discussion in 'Mech Tech' started by Deefer66, Jan 16, 2020.

  1. Anyone done it?

    Mines a bit marked

    [​IMG]

    What happens to the clutch plate locating studs when the rim is taken down to match face....

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  2. davidoft

    davidoft Sponsor

    You pull the dowels our and refit them after machining
     
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  3. ... ah. . they will pull out! Ta very much.... big pliers when I get home later then... fab

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  4. not sure if you need to remove dowels, do you have to remove from both faces?

    I think the important thing is to break/remove the polished varnished surface. Do all the dimples actually have to be removed?
     
  5. It’s only the area that the friction plate bears on that will need machining. All the rest is decoration.
     
  6. Friction surface and the rim the clutch plate bolts onto to by the same ti keep the pressure in the clutch plate the same..

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  7. MorkC68

    MorkC68 Administrator

    We machined the flywheel on Gusbus' type 4 a
    bit like this:
    Opening out the spigot bearing hole:
    DSC02437.JPG

    DSC02438.JPG

    And the clutch face
    DSC02439.JPG

    DSC02440.JPG

    DSC02441.JPG
     
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  8. 77 Westy

    77 Westy Supporter

    The area where the dowels are should be machine too. Whatever is removed from the friction plate face the same amount should be removed from where the pressure plate fits so their position relative to each other remains the same.
     
  9. Wouldn't it be just like starting with a clutch plate 0.5mm thinner if thars how much you took off?

    Going to do it anyway I was just wondering...

    That's a hell of a garage you have there...

    I'd try mounting it on a drill chuck but I dont think the 18v makita would get me very far....

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  10. MorkC68

    MorkC68 Administrator

    I wish! It’s works lathe and DTI, mores the pity!
     
  11. MorkC68

    MorkC68 Administrator

    not sure tbh, I have it wrote down somewhere. I’ll have a search round later
     
  12. 77 Westy

    77 Westy Supporter

    Exactly; the clamping effort is less and the ability of the clutch to transmit torque is reduced.
    Although machining on a lathe is good enough this is how it should be done: https://www.hthoward.co.uk/flywheel-machining/
     
    Last edited: Jan 17, 2020
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  13. I'll ask him later how they do it.. if they get a chance to fit it in .. £40 + vat seemed worth a punt compared to new ones... wish I hadn't sold the spare now!...

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    Last edited: Jan 17, 2020
  14. Moons

    Moons Supporter

    That finish looks like the old laser disk adverts from the early 80's - bet that cost mucho dineros....
     
  15. Looking at @MorkC68 's flywheel

    [​IMG]

    Has a raised ridge where clutch plate bolts on..

    Mine has a recess of a fraction..

    [​IMG]

    Does this mean it's been skimmed before of is it just different flywheels? Rounded bolt hole entrance suggest it's not cut at all

    Does anyone know the 'stock' step height to check... mine in the shop for skimming now...

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  16. MorkC68

    MorkC68 Administrator

    that one is a flywheel for a 228mm clutch plate. I forget where I got it from though. I think it came from Alan when I got the AP motor off him years back
     
  17. 77 Westy

    77 Westy Supporter

    Unfortunately, I don’t know what that dimension should be, @Gnasha might have a 228mm flywheel that he could measure.

    A wasserboxer flywheel fits a Type 4 crank but the ring gear is about 2mm further towards the gearbox, maybe you don’t have an air-cooled flywheel – it certainly looks like it’s been water cooled anyway.:)
     
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  18. Well it worked with the box that's on there.. which I think is just a 3 rib one.. but as it's a rebuild AP with one 1800 head and one 2ltr head and a distributor I've never seen before that was too long but worked!.. could be anything on there.

    Anyone recognise this..?


    After a quick Google for pics I think it is a 1.9 to 2.1 type 25 waterboxer one.. which is 228mm and can go on a type 4.. might go check the clutch for part numbers later..

    [​IMG][​IMG]

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    Last edited: Jan 17, 2020
  19. 77 Westy

    77 Westy Supporter

    Compared to Mark’s his looks like a cast flywheel, yours possibly forged – if you believe what you read on the internet. There might be the part number on it somewhere - 025105271 if it’s from a wasserboxer. It’s had some ‘work’ carried out to the bore (crankshaft side), it shouldn’t really look like that, check that the spigot bearing doesn’t foul on that chamfer.
     

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