Cylinder head nos.

Discussion in 'Mech Tech' started by Soggz, Oct 15, 2021.

  1. Soggz

    Soggz An inquisitive supporter

    Just out of interest. What do the larger numbers on these heads signify?
    Both heads taken from the same engine. (14 and 10). F3505E12-89B9-4B90-B034-2703B14B7A31.jpeg
     
  2. MorkC68

    MorkC68 Administrator

    the top number beginning 113 is the part number.

    10 and 14 will probably be the mould tooling number typically used to help identify issues with the mould ie wear / damage etc
     
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  3. Soggz

    Soggz An inquisitive supporter

    Ok. I realise the part no.
    I’m a bit thick.
    Can you explain a bit more please?
    About the mould tooling no.
     
  4. MorkC68

    MorkC68 Administrator

    So, the cylinder head will be (possibly) sand cast from a pre defined shape, the mould tool / pattern depending on who you talk to in casting circles.

    Each pattern will have a number in your case 10 and 14.

    Those number are generally used for traceability so, for example, if all castings marked 10 start having issues then they can dig the pattern out and inspect it for damage etc
     
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  5. They are indeed mould numbers.
     
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  6. Soggz

    Soggz An inquisitive supporter

    Great. Thanks.
    Every day is a school day! :thumbsup:
     
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  7. Soggz

    Soggz An inquisitive supporter

    Cool.
    I never knew.
     
  8. Don’t know whether the heads were sand cast or die cast. I’d go for die cast.
     
  9. MorkC68

    MorkC68 Administrator

    Probably die cast, more sensible approach!

    HPDC wasn't around back then and I don't think Direct Injection (Disco) was either
     
  10. Usually have a lot of flash on them, implies die cast.
     
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  11. Soggz

    Soggz An inquisitive supporter

    What’s ‘flash’? (No ‘Gordans Alive’ jokes,please…)
     
  12. MorkC68

    MorkC68 Administrator

    an excess of material where the two halves of the moulds join together..it’s nothing to worry about as it’s removed in the manufacturing process.

    injection moulded plastics have flash along the split lines too.
     
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  13. Soggz

    Soggz An inquisitive supporter

    Ok, thanks. Just waste cast material, then.
    Best to file all that stuff off if inbetween the fins.
     
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  14. MorkC68

    MorkC68 Administrator

    yep it is waste material.

    A fine file will clean the fins up nice, it’s worth taking time to do that, help with airflow
     
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  15. mikedjames

    mikedjames Supporter

    Its worth looking at pictures of heads where all of the airways have been cleared of flash - some of the "solid" bits in the middle of the head can turn out to be flash that blocks cooling airflow.
     
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  16. Soggz

    Soggz An inquisitive supporter

    Yes.
    Found some when I replaced the thermostat rod.
    Cleaned it all up.:thumbsup:
     

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