8/19/2019 High Speed Engine Cam Wear Example

1/13

8/19/2019 High Speed Engine Cam Wear Example

2/13

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.

8/19/2019 High Speed Engine Cam Wear Example

3/13

8-3-2011NO KNOCK

8/19/2019 High Speed Engine Cam Wear Example

4/13

11-28-2011

KNOCK WAS FOUND DURING A PM RUN

8/19/2019 High Speed Engine Cam Wear Example

5/13

12-7-2011

INSTALLED NEW STYLE ROCKER ASSEMBLYKNOCK STILL THERE

8/19/2019 High Speed Engine Cam Wear Example

6/13

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.

8/19/2019 High Speed Engine Cam Wear Example

7/13

3-7-2012

KNOCK STILL THERE - LOWER AMPLITUDE

8/19/2019 High Speed Engine Cam Wear Example

8/13

NEW ENGINENO KNOCK

8/19/2019 High Speed Engine Cam Wear Example

9/13

8/19/2019 High Speed Engine Cam Wear Example

10/13

8/19/2019 High Speed Engine Cam Wear Example

11/13

Intake Cam Lobe LB # 3

8/19/2019 High Speed Engine Cam Wear Example

12/13

8/19/2019 High Speed Engine Cam Wear Example

13/13

THE END