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Thread: Would you machine this flywheel?

  1. #1
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    Would you machine this flywheel?

    Question for the Puma guru’s - would you bother machining this flywheel?

    Hard to get a good photo of the flywheel surface, but can’t see any scoring or hot spotting etc.

    The friction plate is well and truly stuffed though.




    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

  2. #2
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    I would Steve but i am no guru. Do you plan to do it in your own workshop?

  3. #3
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    That would be the plan. My big lathe will easily swing it.
    I have to remove the flywheel anyway to fit the new rear crank seal so it’s not that big a deal to give it a quick skim. Hopefully i can hold it in the chuck as is, but no drama to make up something to mount it on if I have to.

    On the other hand if people have found that theres really no benefit as the clutch always beds in fine with a surface like that - then I’ll probably just leave it alone.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

  4. #4
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    You wouldn't machine a flywheel on a lathe, they need to be surface ground not machined.

    Better off hitting it with a flapper disc than turning it in a lathe.
    If you have milling machine & rotary table use a grinding cup but your tramming has to be spot on.

    I did this one , should've left it alone as the clutch now judders.

    EM514665.jpg
    Last edited by goingbush; 10th February 2023 at 09:05 AM.

  5. #5
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    Thanks Goingbush.

    I definitely wouldn't attempt it on my mill. I've got grinding wheels etc to do it, but don't think my rotary table is rigid enough to guarantee it was flat while being cranked around. Likely it would rock slightly with that large diameter on a 6" RT.
    Setting up a makeshift toolpost grinder in the lathe would likely be a better option if I really needed to do it.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

  6. #6
    BradC is offline Super Moderator
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    I'd have thought turning it would risk breaking through the hardening. I've seen what was left of a vehicle, trans tunnel and drivers left leg when a flywheel that had been "machined" had let go. It wasn't pretty.

    Not that you'll be doing 1/4 mile sprints mind you. All the flywheels I've had resurfaced were ground the barest minimum required to produce a usable surface, but it's been > 20 years (closer to 30) since I had one done.
    MY08 D3 - The Antichrist - "Permagrimace". Turn the key and play the "will it get me home again" lottery.

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