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Join Date: Jan 2005
Location: Gilroy, California
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I need two new Rocker Arms, Why do I have to have the Cam and Rockers Re-ground?

It doesn't make sense to me but can anyone help. I have two broken rockers on the right side cam, an intake and exhaust were broken, why do I have to perform work (grinding) on new rockers and the cam? I magnufluxed the cam and it had no cracks so what's the big deal? Your comments are greatly appreciated.

Best Regards,

Alex
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1974 Porsche 911 Coupe, RSR Project
1976 Porsche 911 Targa, Black
1986 Porsche 911 Carrera, Black
2006 Porsche Cayenne S, Black
Old 03-29-2005, 10:44 PM
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Tyson Schmidt's Avatar
 
Join Date: Nov 2001
Location: Burbank, CA
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If you know how to inspect rockers and lobes, then you may not have to.
If you have decent lobes, and a good pair of used replacement rockers, then you can install them and check their mesh with one another with some Prussian Blue to make sure that they are square.
Otherwise, there may be high pressure points that will wear rapidly and the surface hardening will chip off from the heat and stress.
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Old 03-30-2005, 12:11 AM
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Tyson,

I see, this I can do and will check for. I have the necessary materials to do the job. I already checked out the cams and there is no damage to the lobes or cracks. Thank you for your time!

Best Regards,

Alex
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Its easier asking dumb questions than fixing dumb mistakes
1974 Porsche 911 Coupe, RSR Project
1976 Porsche 911 Targa, Black
1986 Porsche 911 Carrera, Black
2006 Porsche Cayenne S, Black
Old 03-30-2005, 07:32 AM
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Wayne 962's Avatar
In general, the parts wear with each other. Putting in new rockers with old cams is like giving yourself a new set of lower teeth in your mouth. You'll have wear points at the high points where they meet - not really a good thing.

However, you can sometimes get away with it if your camshaft is not worn too much...

-Wayne
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Old 04-01-2005, 01:10 AM
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A nice surprise to hear from you Wayne, thank you for your feedback and great job with Pelican Parts!

Best Regards,

Alex
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Its easier asking dumb questions than fixing dumb mistakes
1974 Porsche 911 Coupe, RSR Project
1976 Porsche 911 Targa, Black
1986 Porsche 911 Carrera, Black
2006 Porsche Cayenne S, Black
Old 04-01-2005, 07:04 AM
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Join Date: Mar 2005
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Wayne - great analogy with the teeth. I take it you are speaking from a bad dental experience? :-)

Alex- you might consider taking all the rockers out and putting RSR seals on the shafts and checking the condition of the other rockers.

JB
Old 04-05-2005, 02:33 PM
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..duplicate removed...

Last edited by jimbauman; 04-05-2005 at 02:36 PM..
Old 04-05-2005, 02:33 PM
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I have all my rockers out and have already bought my entire rebuild kit from Pelican, including the RSR seals. I plan to check the rockers out as well. Any suggestions on who can recondition my rockers in Northern California, or is it really needed if everything looks well?
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Its easier asking dumb questions than fixing dumb mistakes
1974 Porsche 911 Coupe, RSR Project
1976 Porsche 911 Targa, Black
1986 Porsche 911 Carrera, Black
2006 Porsche Cayenne S, Black
Old 04-05-2005, 09:10 PM
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