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Thread: collapsed lifter?

  1. #1

    Default collapsed lifter?

    I developed an intermittent knock about 3 months ago that would come and go...Now when the truck is cold I'll start it up and it runs for about 45 seconds and starts knocking very loud. Then after it warms up it goes away, but then going down the road 2k rpm and up I can hear it a little bit. And it smokes a little bit at idle and a little worse with it in gear and the a/c on. No drop in oil pressure(mech gauge), no fluxuation in boost pressure...last motor I had in it smoked at idle it was a worn rocker arm so I'm thinking valve train problem. Anything else I should look for before I tear into this beast again? Opinions? (Motor is a '93)
    1995 K2500 HD (F) vin - 201000 miles, 4.10 diff, turbomaster "fresh rebuilt" motor, Marine injectors, #9 resistor, straight piped, stacks, custom paint, 4" lift, 35's

  2. #2
    Join Date
    Feb 2007
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    Use a piece of hose to locate the noise, I could locate the noise from each bad rocker that way.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  3. #3

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    yeah I tried that in a few places and it all seemed the same when on the right side of the engine, its louder on the under side of engine though...
    1995 K2500 HD (F) vin - 201000 miles, 4.10 diff, turbomaster "fresh rebuilt" motor, Marine injectors, #9 resistor, straight piped, stacks, custom paint, 4" lift, 35's

  4. #4
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    Underside of engine is always very noisy from combustion. You should check for balancer and vacuum pump noise, remove the drive belt to check. Passenger side rocker cover has the CDR valve baffle inside, and makes it difficult to hear where the noise is coming from.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  5. #5

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    harmonic balancer is new, vacuum pump is gutted, this is a LOUD and i mean loud knock, I can here it inside my house over the truck...
    1995 K2500 HD (F) vin - 201000 miles, 4.10 diff, turbomaster "fresh rebuilt" motor, Marine injectors, #9 resistor, straight piped, stacks, custom paint, 4" lift, 35's

  6. #6
    Join Date
    Feb 2007
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    I would suspect a bad injector, loosen the lines one at a time to find it.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  7. #7

    Default

    I did that too, when i cracked back passanger injector line the knock did get softer but it was still there, injectors are less then a year old.
    1995 K2500 HD (F) vin - 201000 miles, 4.10 diff, turbomaster "fresh rebuilt" motor, Marine injectors, #9 resistor, straight piped, stacks, custom paint, 4" lift, 35's

  8. #8
    Join Date
    Feb 2007
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    The back passenger side is the first to suffer valve train failure.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  9. #9

    Default

    alright, I vagley remember reading one of your post when you were changing the lifters in yours...IIRC you said something about not being able to get to one of them with the heads on because of a casting in the block/head blocked it. How much of a pain is it to get them out with the heads on?
    1995 K2500 HD (F) vin - 201000 miles, 4.10 diff, turbomaster "fresh rebuilt" motor, Marine injectors, #9 resistor, straight piped, stacks, custom paint, 4" lift, 35's

  10. #10
    Join Date
    Feb 2007
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    It is a pain, but in the end I changed them all with the heads in place. I made a removal/assembly tool that made it much easier than just using a magnet. I can photograph the tools and post them if you want, or can send the photos full size to your Email.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

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