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1976 911S Targa
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Lower Valve Cover
I just removed the lower valve cover to adjust valves and noticed what appears to be thick plastic on the cover that has been partially removed. What is this plastic? Thanks
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10-16-2016, 08:43 AM
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Maybe a ham fisted porosity fix.
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1972 911T Coupe with a '73E MFI engine and 'S' pistons 10 year resto mostly completed, in original Albert Blue. ***If only I didn't know now what I didn't know then*** |
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10-16-2016, 10:16 PM
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You should replace those lower covers with turbo covers.
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10-16-2016, 11:32 PM
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1976 911S Targa
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What improvement do turbo valve covers provide? Why replace the existing covers?
Thank you. |
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10-17-2016, 03:54 AM
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Turbo covers are built much sturdier and they're not prone to warping and leaking+they look cool.
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10-17-2016, 04:48 AM
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Reiver
Join Date: Nov 2011
Posts: 57,385
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If they do not leak then finish your job and replace them....if they do then get the Turbo's at some point.
That 'fix' won't hurt anything whatever it is.
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De Oppresso Liber Strength and Honor 5th Legion |
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10-17-2016, 08:31 AM
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Registered User
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How do you identify turbo vs non- turbo
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10-17-2016, 08:53 AM
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Reiver
Join Date: Nov 2011
Posts: 57,385
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Quote:
http://www.pelicanparts.com/cgi-bin/ksearch/PEL_search_2014.cgi?command=show_part_page&please_wait=ND&SUPERCAT_FLAG=Y&make=POR&model=801§ion=engcyl&page=1&bookmark=1&part_number=930-105-116-05-M260
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De Oppresso Liber Strength and Honor 5th Legion |
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10-17-2016, 09:25 AM
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1976 911S Targa
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Thanks for all the feed back.
These covers don't leak so I'll put them back on the car and hope they seal tight. By the way, I've looked at many pictures of magnesium lower valve covers and none have the thick plastic coating that my covers have (or had). Is it possible that lower valve covers originally had a baked on plastic? The plastic is about 1/4 inch thick. |
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10-17-2016, 08:49 PM
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Functionista
Join Date: Jul 2011
Location: CO
Posts: 7,717
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Porsche did the plastic coating for noise control.
I'm going back to mag covers myself. Not that hard to true them up each valve adjust if needed. And RSRs ran them. 
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Jeff 74 911, #3 I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible. |
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10-17-2016, 08:58 PM
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I had a 75 911S that had lower covers with thick plastic on them. The plastic would melt and harden on the cover nuts, so to remove the covers, you would have to chisel the hard plastic off the nuts. If sound reduction was the factory's goal, not a very eligent solution. Rob
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10-18-2016, 04:52 PM
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1976 911S Targa
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Okay! That's what is on the covers, thick plastic that has been removed over the years. I presume the under lying metal is magnesium, correct?
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10-18-2016, 06:40 PM
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Functionista
Join Date: Jul 2011
Location: CO
Posts: 7,717
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A 76 should still be mag as I recall.
__________________
Jeff 74 911, #3 I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible. |
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10-18-2016, 06:49 PM
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Reiver
Join Date: Nov 2011
Posts: 57,385
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Shops often true them, if warped, using a sheet of glass (flat surface) with a light grit paper on it.
Go slow and check often for true/flat.
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De Oppresso Liber Strength and Honor 5th Legion |
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10-18-2016, 07:14 PM
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1972 Porsche 911T
1973 Porsche 911S
