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Thread: Is 4age an interference type engine?

  1. #1
    Join Date
    Jun 2004
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    Edmonton, AB
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    Is 4age an interference type engine?

    I started my engine once a few months ago and it ran perfectly. Then I tried to start it again a week later and couldn't get it to fire up again. Now I finally had time to look into it again and discovered a crescent shaped cut in the timing belt across 2/3 of the belt width. So I took off the valve covers and found that both cams had moved about 60 degrees clockwise from where they should have been with #1 at TDC. Obviously the belt jumped a few teeth whenever it got cut. I have no idea what could have cut it yet until I dig a bit deeper into it. So I'm wondering if I would have had any valve vs piston action when I tried starting it the second time.

  2. #2
    visean's Avatar
    visean is offline Yo, troubled night in the John
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    Nov 2005
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    Victoria BC
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    If it's a stock blue top, it's non interference.

  3. #3
    Join Date
    Jun 2004
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    It's 20v short block with 16v head and gze pistons...

  4. #4
    Join Date
    Jul 2009
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    Maple Ridge, Bc
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    then no it is not. your safe.
    -Cam-

    85 RA64 Celica 22RTE CT26
    91 MX83 Cressida stock

  5. #5
    Join Date
    Jul 2003
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    Lethbridge Alberta
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    Pull lower covers, crankshaft pulley and timing belt shield off, I bet you'll find a but or bolt that's fallen down the covers and is shredding the belt/jamming it up causing belt to skip

    Short answer is all stock 4ag engines are non-interference
    Owned too many different modified toyotas to list LOL


  6. #6
    Join Date
    Jun 2004
    Location
    Edmonton, AB
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    759
    Oh good, that makes me feel better. I just got my intake finished and was ready to put it together... Now I guess I'll be doing a timing belt

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