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Old 04-14-2008, 04:43 PM
dpetryk's Avatar
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Join Date: Sep 2001
Location: Houston, Texas
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Need insite on engine internals (M116)

I am having a problem on a couple of my M116 engines. The problem centers around the hydraulic compensators. I usually get a ticking noise when I first start the engine. Especially on cold mornings. Stopping and restarting the engine usually cures it but not always. Now the problem had gotten worse to the point that often times after the engine is warmed up the ticking just starts and stops randomly while driving. I can understand things being sticky when its cold but the random stopping and starting thing is a puzzle. I am worried about beating the cam / followers to death.

Engine has 235K miles, steady diet of Mobile 1 oil since 150K changed at 5K miles or less.


What causes this to happen?

Is the compensator pressurized from the oil system?

Does the compensator use the oil overflowing from the cam oiler tubes to "pump up". If so what would cause the compensator to "deflate" once the engine is running?

Do these things wear out or just get sticky?

What is your recommended course of action to solve this problem.

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