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Thread: What are thread dimensions for the 18RG Timing Chain OIL Nozzel?

  1. #1
    Normally Aspirated Domestic Engineer RT104GT's Avatar
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    Default What are thread dimensions for the 18RG Timing Chain OIL Nozzel?

    Hi
    I have a damaged thread in my 18RG Yamaha head and need to re-tap the 9.5 mm hole with the correct thread that suits the OIL NOZZEL.
    Can anyone tell me the thread dimensions please?
    The Nozzel measures 9.5MM and might be BSP 1/8th
    It should be tapered gas thread but its not quite like the fittings in the inlet manifold that feed the power brake booster, nearly but not quite.
    I think they are 9mm not 9.5.
    a 10mm x 1.0 fine sort of seems close but the thread on Nozzel is tapered 0.5mm
    But I need the thread dimensions so I can buy a tap if such a tap exists.
    Going to see plumber so see if any gas thread tapered fits




    The part number for the nozzel is 90072-73103 and available from Japan for about $10 plus postage.

    Has anyone fabricated one ??
    What size holes di you drill?

    Thanks for looking

    email vk3zaz at gmail.com if you have any data I can use.
    1973 RT104-MQFG 012604 Corona GT JDM
    1989 ST185-BLMVZ-0007199 Celica GT4 JDM
    1968 RT40S Corina 1600S series 2
    2012 ZN-6 86GT

  2. #2
    RZN169R+2JZGTEVVTI+R151 Domestic Engineer madmont's Avatar
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    Default Re: What are thread dimensions for the 18RG Timing Chain OIL Nozzel?

    May be 1/8 NPT . What is the tpi?
    Jealousy is a curse

  3. #3
    Junior Member Backyard Mechanic
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    Default Re: What are thread dimensions for the 18RG Timing Chain OIL Nozzel?

    So Thread pitch gauge will not solve this question?

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