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Location: Picton Ontario Canada
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Brown Cam Plug popping out

My brown cam plug has popped come out twice, with only 4,000 miles in between occurrences.
Had a new one replaced and it seemed to go in quite easily. IMS has been done.
Is there any reason why this would occur?
Old 08-13-2018, 06:29 AM
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Originally Posted by paulgentile View Post
My brown cam plug has popped come out twice, with only 4,000 miles in between occurrences.
Had a new one replaced and it seemed to go in quite easily. IMS has been done.
Is there any reason why this would occur?
Two known causes for cam plugs popping: Too much sealant was used when reinstalling the cam covers, causing the adjacent oil return to plug and the oil pushes the plug out; or the AOS is not working properly and the crankcase is experiencing pressure rather than vacuum, which is popping the plug out.

Just as a "by-the-by", never use any type of sealant on the cam plugs.
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Old 08-13-2018, 08:37 AM
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Thanks! AOS was replaced and seems to check out. Likely the other. On the by-the-by, my mechanic did put some sealant on the new plug. Should I replace the plug?
Old 08-16-2018, 05:20 AM
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Thanks! AOS was replaced and seems to check out. Likely the other. On the by-the-by, my mechanic did put some sealant on the new plug. Should I replace the plug?
Yes, and clean all of the sealant off the cam cover as well. These were designed to be installed dry, meaning no sealant of any kind.
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Old 08-16-2018, 08:09 AM
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Yes, and clean all of the sealant off the cam cover as well. These were designed to be installed dry, meaning no sealant of any kind.
You do need a thin layer of silicone between the cam cover and the head, because there is no gasket. Am I wrong?
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Old 08-17-2018, 02:44 PM
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You do need a thin layer of silicone between the cam cover and the head, because there is no gasket. Am I wrong?
Yes, but only a very thin bead or the excess sealant can get into the oil returns, causing oil to flood the cam cover and blow out the cam plugs.

There should never be any sealant on the cam plugs.
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Old 08-17-2018, 03:26 PM
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back in the day when i had the 996.. the cam plugs leaked and popped out ..
after the the vario cam guide replacement. instead of redoing the cylinder head sealant .. i put a little rtv( Porsche spec brand i forget the brand now)on the plugs and they never gave me a problem ever
Old 08-20-2018, 06:45 PM
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Originally Posted by 991gts6s View Post
back in the day when i had the 996.. the cam plugs leaked and popped out ..
after the the vario cam guide replacement. instead of redoing the cylinder head sealant .. i put a little rtv( Porsche spec brand i forget the brand now)on the plugs and they never gave me a problem ever
Very bad idea, they are designed to be used without any type of sealant.
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Old 08-21-2018, 11:03 AM
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^^^^ this.
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Old 08-23-2018, 07:03 PM
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