Question about 1992 Chevrolet C/K 2500

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Help my truck is knocked up

Have a 1970 chevy c20 pu all of a sudden its got a heavy knocking noise coming from it oil is good son told me it started when he accelarted up hill

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  • schwangod Oct 23, 2008

    so best to replace bearing or engine?

  • schwangod Oct 23, 2008

    yeah deep knock not lifter tapping or lite noise

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Hi shwangod, you said it was a "heavy knock" and it began climbing a hill, could you give me a little more info, mileage, overall condition,2 or 4x4 am assuming this is a small block 350 cid, obviously there are different "knocks" for different problems, lifters do not knock they will click or rattle and are easy to adjust, a timing knock is the resultant effect of incorrect timing usually on the low side and is also easy to determine.A wrist pin knock associated with the piston boss pin can sound like a main bearing knock and is worse when the engine is cold and will subside as the engine warms up, the main bearing knock is the heavy knocking that doesnt quit and can lower oil pressure (operating) you can plastguage the mains to determine the amount of wear and if you are lucky you can roll in a set of bearings, when you drain the oil look for metallics, specifically brass, personally I am not a fan of upper or lower engine rebuilds but prefer to "Rebuild" the entire engine. I hope this helps you,good and let me know how you make out.

Posted on Nov 10, 2008

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Sure sound like a spun bearing in the engine cause by over rev.

Posted on Oct 23, 2008

  • paul erickson
    paul erickson Oct 23, 2008

    i would first make sure its a deep knock and not a tapping noise from the lifters or rocker arms

    if you pull the oil pan and check the bearings or a quick way is to remove the oil filter and cut it apart to see how much metal is in the filter if alot you should replace the engine.

  • paul erickson
    paul erickson Oct 23, 2008

    im sure then you have a rod brg spun. this would require a full rebuild or purchase a used engine or a rebuilt. i havent had very good luck with rebuilt engines. with a litle work you could find a newer engine to install with minor mods. the salvage yards can tell you what mods you would need to do for different engines/

    this could be a fun project.

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