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  1. #1
    Join Date
    May 2020
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    s.w. sydney
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    Default help with spring valve seat manufacture, + steel sourcing S.W. Sydney

    hi , i,m rebuilding my fiat tractor engine at this time. i am in the reassemble phase. i,m going to send the head off to get decked and vacuum tested (for valve sealing) . i pulled all the valves out and lapped them in good. then i took the head to pressure clean , and during this step , i,ve lost a valve spring seat. for those unaware , the valve spring sits on a hard seat, as opposed to the spring sitting on cast iron (and wearing it out). well, stupid, studip me has gone and lost one seat. i,ve looked and looked, but i can,t find it. very frustrating to say the least. fiat suppliers don,t stock this any more, its a 1976 model.

    the silver lining is that i get to use my hercus lathe and make something up.
    i enjoy learning new things (machining hard steel).

    i,m inexperienced in this type of steel selection, and i think i will need a 4130 or 4140 steel or other?, however i would like recommendations and opinions please. the steel needs to be tough and machinable. i don,t think mild steel is tough enough, i can do better!

    does anybody know where i can get this special steel stock? in S.W. Sydney or wollongong? ive used southern steel at milperra many times , not sure if they stock harder steel thou. i only need 150mm to 300mm rod/shaft will do. the seat dimensions are; 36.42mm dia, about 6mm height, and steps down to 3mm , and about 14.25mm hole.

    thanks mick

  2. #2
    Join Date
    Jun 2007
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    sydney ( st marys )
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    Default

    Are you going to harden it when finished?

  3. #3
    Join Date
    May 2020
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    s.w. sydney
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    Default

    Quote Originally Posted by pipeclay View Post
    Are you going to harden it when finished?
    i can do it, but is it necessary using harder steel?

  4. #4
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    Default

    Can't answer if it is better to or not, probably using 4140 or en36 should be fine.
    A supplier in the S/W you may need to search for unless you try the steel store.

  5. #5
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
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    Default

    Hi Mick, Guys,

    As far as I'm aware those spring cups are not hardened ! You could check with a file on the outer edge of one.

    As far as loosing one, try waving a magnet around in the general area.

    I lost a M6 grub screw into the lawn, no way could I see it in the grass, a magnet found it about three feet away from where I thought it should have been.
    Best Regards:
    Baron J.

  6. #6
    Join Date
    Nov 2017
    Location
    Geelong, Australia
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    57
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    Default

    Is it just a thin washer approx 1mm or less like used on a lot of aluminium heads, or is it thicker with possibly a profile ie not just flat?

    A photo of one of its orphaned siblings would be good

    Steve

  7. #7
    Join Date
    May 2020
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    s.w. sydney
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    53

    Default

    Quote Originally Posted by BaronJ View Post
    Hi Mick, Guys,

    As far as I'm aware those spring cups are not hardened ! You could check with a file on the outer edge of one.

    As far as loosing one, try waving a magnet around in the general area.

    I lost a M6 grub screw into the lawn, no way could I see it in the grass, a magnet found it about three feet away from where I thought it should have been.
    yeah , i thought of that, at this time i have to work on grass. distance to wash area a bit to much, and i have no gold finder.

  8. #8
    Join Date
    May 2020
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    s.w. sydney
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    Default

    Quote Originally Posted by OxxAndBert View Post
    Is it just a thin washer approx 1mm or less like used on a lot of aluminium heads, or is it thicker with possibly a profile ie not just flat?

    A photo of one of its orphaned siblings would be good

    Steve
    the spring sits on a 3mm section ,similar but much thicker that a car valve spring seat. then it steps up from 3mm , to 6mm inner height. the inner height keeps the spring centralized on the spring seat . it is not flat. the spring is centralized by the washer/seat , that rises INTO the spring, to 6mm . i dont know how to post pictures.

  9. #9
    Join Date
    Nov 2017
    Location
    Geelong, Australia
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    57
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  10. #10
    Join Date
    May 2020
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    s.w. sydney
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    Default

    Quote Originally Posted by OxxAndBert View Post
    yes, thats it, just different dims.

  11. #11
    Join Date
    May 2011
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    Murray Bridge S Aust.
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    To grow old is mandatory, growing up is optional.

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