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Tappet clearance

Discussion in 'Gen 3 Prius Technical Discussion' started by Lemon Drizzle, May 27, 2022.

  1. Lemon Drizzle

    Lemon Drizzle Junior Member

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    Dearest Prius Community,

    Does anyone know the clearance values to adjust tappets on the 1.8 petrol prius engine? Inlet and exhaust please.

    Many thanks
     
    #1 Lemon Drizzle, May 27, 2022
  2. PriusCamper

    PriusCamper Senior Member

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    #2 PriusCamper, May 27, 2022
  3. Lemon Drizzle

    Lemon Drizzle Junior Member

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    Brilliant, thank you. But can this;
    1) hydraulic system fail?
    2) What can be the symptoms of a failure?
    3) Prognosis - how would I fix a failure in function of the system?
     
    #3 Lemon Drizzle, May 27, 2022
  4. BiaoH

    BiaoH Junior Member

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    The hydraulic system is so simple that it does not fail very often as long as you change engine oil regularly.
     
    #4 BiaoH, May 27, 2022
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    They’re auto adjusting hydraulic, effectively zero clearance; no adjustment is needed.
     
    #5 Mendel Leisk, May 28, 2022
  6. Lemon Drizzle

    Lemon Drizzle Junior Member

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    That's good to know. Thanking you for your replies.
     
    #6 Lemon Drizzle, May 28, 2022
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  7. ChapmanF

    ChapmanF Senior Member

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    There are 16 individual lash adjusters, one for each valve, they're all identical, and they are fed from an oil gallery carrying pressurized engine oil from the oil pump.

    If you happen to have the camshafts out, you can lift the lash adjusters out of the head and test each one. There is a test method described in the repair manual. If one doesn't test well, you replace it. Each one is $33.59 suggested list.

    Toyota Service Information and Where To Find It | PriusChat
     
    #7 ChapmanF, May 28, 2022
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  8. Lemon Drizzle

    Lemon Drizzle Junior Member

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    Many thanks. This is brilliant information.
     
    #8 Lemon Drizzle, May 28, 2022
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