Question about 1966 Ford Mustang

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66 Mustang has loud click

Just started my 66 Mustang, "A" engine (289, 4 barrel) after not running it for about 2 years Amazingly, it started after about 2 minutes of on-and-off cranking. I ran it for about 10 minutes to warm it up and get the thermostat open. It has a loud click. I was hoping it was a tappet that needed oil. It still clicked when I shut it down. What are some other ideas? My main work on the engine was to change the timing chain and sprockets, the water pump, and the thermostat. What do you think?

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  • Lowell Claassen May 16, 2009

    The oil pressure is in the "good" range. It is at the same place that it has been in the past.

  • Lowell Claassen May 16, 2009

    About all that I can say is that it is from the engine. I stood in front of it and couldn't really pinpoint it. I probably should get a long screwdriver and lay it at various places in the engine to try to locate it better.

  • Lowell Claassen May 17, 2009

    It seems like location is a recurring question. I will try to pinpoint it better and get back to you.

  • Lowell Claassen May 21, 2009

    It seems that nov2771 had the right answer. I put about half a can of seafoam in the oil and started it. The noise slowly went away. It now sounds the way that I remember it from the past. Thanks.

  • Michael Masters
    Michael Masters May 11, 2010

    That would be great. i can help in a more accurate manner if you could give me a general location of the sound.

  • Michael Masters
    Michael Masters May 11, 2010

    Where is the location of this clicking sound you are hearing at this time??

  • Michael Masters
    Michael Masters May 11, 2010

    hows the oil pressure when its running?

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  • Master
  • 532 Answers

Probably a clogged or collapsed lifter,add seafoam to the oil and see if it helps

Posted on May 17, 2009

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It sounds like you have a loose rocker. its a simple fix. just take the valve covers off and wiggle the rocker arms. they should move but not much. if one is moving alot more then others then thats probably the one. make sure that the number one piston is at TDC (top dead center) then start from that rocker to the next by hand cranking the engine after checking the rocker spacing. ........i sounds complicated but fairly easy. hopefully i shed some light on your problem...

Posted on Mar 27, 2012

  • Lawrence Sep 16, 2013

    Oh boy he could not be more wrong. Each tappet and value has differnt "play" in valves. the fireing order of the engine and each piston to judge which tappet valve needs adjcustment. You will need a tmiing light , and a professional mechanic.

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