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Cam Lobe Ground Down


Old 08-11-2018, 02:09 PM
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Cam Lobe Ground Down

My cam lobes are done and need to rebuild engine head. What makes more sense to rebuild head or purchase new? What are the pros and cons including cost? There is a machine shop near me that is highly rated but I dont know the experience with 22REs. Also, what would cause this? Low oil pressure? Thanks for the advice.

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Old 08-12-2018, 06:31 AM
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Always helpful to put some text with a photo..

In the first image, you are trying to show the tip of the lower cam lobe?

Looks like the wear starts right near the high point, this could be from improperly adjusted valve clearances. Either combined with lack of oil flow or causing the lack of flow, doesnt matter what pressure you have in the galley if theres no gap/clearance there is no flow so no cooling or lubrication. Aswell pre-ignition could be trying to slam that valve closed.

Bottom line, time for new rocker arms and a cam for sure.
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Old 08-12-2018, 10:29 AM
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What brand of motor oil have you been using??? How many miles has the engine run???

The cam lobes are oiled by dipping into oil that is held in dams in the top of the head.

I have seen an aftermarket head where these oil dams would not hold oil as the OEM heads do.
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Old 08-12-2018, 06:11 PM
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Also seen soft aftermarket cams. Or bad break-in and let to an premature problem as well
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Old 08-12-2018, 08:47 PM
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Co_94_PU...yes that is the tip.

The engine has 171K miles. It runs sluggish as a result of the jacked up cams. I dont recall the motor oil brand that I used, it was a Jiffy lube over 75K miles oil which I believe is Penzoil.

Going to definitely take it to a machine shop for a rebuild.
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Old 08-14-2018, 04:56 PM
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Your rod bearings and main bearings probably do not look much better. I just dealt with this. loose timing chain tensioner, flat cam, worn bearings, wasted crank. Even with new cam, no oil pressure, engine still ran great, just smoked. I would rebuild.
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