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pistons 4 rings or 2?

Discussion in '40- & 55-Series Tech' started by euclid, Mar 24, 2003.

  1. euclid

    euclid SILVER Star

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    A buddy has a local shop rebuild his August of 74 FJ40. The shop said the pistons have 4 rings per piston, and they are used to seeing 2 rings per piston. Any ideas on why there is a difference? Should he take care to replace them with the 4 ring versions?
     
  2. sport

    sport

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    The 4 rings are standard in the F. Here is the description from the TLC FAQ page:

    "The main differences between the F and the 2F are the 2F's larger bore, the F's 2 compression and 2 oil rings versus the 2F's 2 compression and single oil ring..."

    Sport
     
  3. Gumby

    Gumby Supamod Staff Member s-Moderator

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    I have a 2F piston on my desk right in front of me. It has two compression rings and one three piece oil ring.
    I went out and grabbed a F piston as well. Two compression rings, one three piece oil ring and one one piece oil ring. Goofy looking.
    2 piston rings are very rare in four stroke gas engines. The vast majority have 3 rings.
     
  4. Gumby

    Gumby Supamod Staff Member s-Moderator

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    here's a pic