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High Speed Engine Cam Wear Example

Date post: 07-Jul-2018
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    Left Bank Cylinder # 3

    3LP ULT + 3LP VTL - is on the bottom of the power head by the engine block.

    3L ULT – is on the valve cover.

    3L VTL - is in the center of the head close to the spark plug.

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    8-3-2011NO KNOCK

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    11-28-2011

    KNOCK WAS FOUND DURING A PM RUN

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    12-7-2011

    INSTALLED NEW STYLE ROCKER ASSEMBLYKNOCK STILL THERE

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    12-9-2012

    Mechanics changed both push rods with new lifters, installed a completely newrocker arm assembly. Inspected all valve springs, valve keepers. Tried to move

    valves to see if any excessive valve guide clearance was present. Everything looksand feels good. Also inspected all rod bearing

    clearances.

    TEST

    Pulled the spark plug wire off of LB #3 with the engine running at 835rpm and

    the knock is still present. Shut engine down, pulled valve cover off, checked valveadjustments again (still ok), rolled the engine over with starting air and there was

    no knock present. Started the engine back up with the valve cover off and theengine running at 740rpm’s and the knock would come and go. Valve train

    assembly is getting plenty of oil to all points and then some (making a mess, haha). Took rpm’s back up to 840rpm with the valve cover off and the knock stayed

    constant, hitting every time at this angle of 470deg.

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    3-7-2012

    KNOCK STILL THERE - LOWER AMPLITUDE

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    NEW ENGINENO KNOCK

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    Intake Cam Lobe LB # 3

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    THE END


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