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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBlow-by popping rubber plugs out of head
Reported or suspected cause
sucks the pressure ized vapor and mixes it
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
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Suspected cause · Original poster
There is a plastic pipe on the side of each head that I suspect sucks the pressure ized vapor and mixes it with intake air as in a PCV on most cars.
Leading evidence: 'sucks the pressure ized vapor and mixes it' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'sucks the pressure ized vapor and mixes it' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check vaccuum' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
With the engine reinstalled it's not possible to pull these and check for vaccuum.
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Suggestion
You can change the valve cover with the engine in the car.
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Suggestion
Porsche uses a odd term for what is a PCV valve, which is on the engine end of the hose that connects to the AOS unit.
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Suggestion
First of all, the most common reason that the green cam plugs pop out is excessive use of sealer on the cam covers.
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Suggestion · Original poster
I was aware that you are not supposed to use sealer on the plugs but I sure did use too much sealant on the driver's side cover which is the one blowing out plugs.
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Suggestion · Original poster
I was aware that you are not supposed to use sealer on the plugs but I sure did use too much sealant on the driver's side cover which is the one blowing out plugs.
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Pelican Parts: 1 discussions
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Hi Forum
1999 Porsche Carrera with 3.4 watercooled boxer 6 cylinder engine non turbo with 6 speed manual.
We just changed both head gaskets and the engine runs fine, except there is blowby on the drivers side head that pops out the rubber plugs that cover the ends of the camshafts.
There is no mention of a PCV valve in the manual. There is a "secondary air check valve. Is this the PCV valve? There is a plastic pipe on the side of each head that I suspect sucks the pressure ized vapor and mixes it with intake air as in a PCV on most cars. With the engine reinstalled it's not possible to pull these and check for vaccuum. Your thoughts on the cause of this blowby and the remedy?
PS I've been told valve guides but the car ran fine before blowing the head gasket. Thanks for your input.
First of all, the most common reason that the green cam plugs pop out is excessive use of sealer on the cam covers. There also should be no sealer used on the green plugs.
Porsche uses a odd term for what is a PCV valve, which is on the engine end of the hose that connects to the AOS unit. Item #6 below:
What JFP says.
Sometimes you can clean out the area near the plug without pulling the valve cover, however
often times sealant has clogged one of the oil routes and it diverts to the green plugs.
My mechanic did this several times until I beat him upside the head a few times
and he learned less is more when it comes to sealant.
m
Thank you for that information. I was aware that you are not supposed to use sealer on the plugs but I sure did use too much sealant on the driver's side cover which is the one blowing out plugs. They sure do have tiny little channels that I could have sealed off. So we will drop the engine again. Thanks so much gentlemen!
FYI these engines Never have problems with the head gaskets!
If you are losing coolant it may be a cracked head which is common after water pump failures.
