Question about 1987 Ford Ranger

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1987 2.3L knocks/after warm up/2500RPM/10 min operation

My 1987 2.3L knocks after warm up at around 2500 RPM. I just redid a head gasket and am currently checking my valve lash becuase it is a overhead cam. It's not a low grade octane fuel, nor mistimed, distributor cap and button is new and T.P.S sensor is working. Any help please? I believe it is carbon load which is combusting like a spark plug under my valve cover for a lack of better words. It's not the usual ford tick either.

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  • Anonymous May 17, 2009

    This is a knock from the upper part of the motor under the valve cover. It runs descent until the motor warms up and then it looses horsepower and starts to knock really really loud from the top end. I thought it was the timing and that was fine, I checked the spark plug gap and kind and their correct, the fuel is the right octane, and I am receiving oil properly to the valves becuase I just removed the valve cover and checked for that. I also have a question of how to tighten valves with an overhead cam, I know there is a service and regular gap that can be adjusted with a set screw correct? I figured this is the next step in figuring out the valve knock. I figured it's just an old head and sense I just did a head gasket I could of messed the valve gap up somehow? Is there anything I am missing? I am a certified diesel mechanic but it's good to get other people's advice with things I've done learned that even though I am a young mechanic.

  • Jonathan Suttles
    Jonathan Suttles May 17, 2009

    I thought it may have been the oil pump but I was getting oil to the top of my head.

  • Jonathan Suttles
    Jonathan Suttles May 17, 2009

    Thank you nov2771 do you have any other ideas please?

  • jg1523 May 11, 2010

    Is it a knock or a tick? Is it coming from the top end or the lower end?

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  • 532 Answers

Probably the oil pump

Posted on May 17, 2009

  • scott May 17, 2009

    Well there is 2 other things ive seen on them and you may not want to hear it,its not an easy fix...1 is maybe a bad rod bearing or main bearing ..2 possible wrist pin worn out,now did this happen before a head gasket change or is it new? Sometimes when antifreeze gets into the oil it mixes with the oil plugging up the sump screen,which has happened to me in my younger days.

  • scott May 17, 2009

    now i see your other comment about being the upper part,then yeah it could be the valve lash,its got to be around the thickness of a match book ,easy to do,loosen the adjusters up 1 turn,warm it up to build up pressure,(not sure what its really supposed to be,havent done it in about 15 years)and adjust it untill the knock goes away and only that much because ive worn out cams in 2.3s before from over tightening them.Hopefully thats what it is,

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Perhaps the oil pump plunger sticks and causes the hydraulic lash adjusters to pump up and hold the valves open? Would this cause the knock? MAybe check the oil pressure when you first start up, an then when the vehicle has warmed up and the knock starts. Just thought I'd throw that out there. Do these oil pumps have PLungers?

Posted on Jun 16, 2009

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