RTV Burn Off

stoweboarder720 · 06-10-2017, 10:27 PM

Hi guys. I recently picked up some permatex ultra copper rtv and applied it somewhat liberally to my valve cover gasket when I reinstalled it in order to hold it on. When i started the car up it ran ok (a bit rough due to misfire) but there was gray-ish smoke (not white so I don't think it's residual oil) coming from behind the engine and it smelled metallic. I have no clue what it could be since I replaced the eccentric shaft sensor and nothing really burns up there.

My question is: Is it possible for high temp copper RTV to have some residual burn off after its recently been applied? Or am I missing something since its rated to 700 degrees F? Any help would be appreciated since I'm scared I'm about to grenade my engine if I keep starting it.

racermp · 06-11-2017, 03:53 PM

Could be some oil fell down. Rtv maybe but I've never seen it smoke or anything before.

stoweboarder720 · 06-11-2017, 10:32 PM

What I think happened is some of the permatex fell onto the exhaust manifold and is burning off, since that's pretty much the only place hot enough to exceed its temperature rating. Drove the car 3 hours today and no smoke so I think it was just that.

racermp · 06-12-2017, 03:33 PM

Yea that would do that. Kinda like burning plastic.

06-10-2017, 10:27 PM	#1
stoweboarder720 Private 31 Rep 87 Posts Drives: '11 E92 335is Join Date: Mar 2016 Location: Seattle iTrader: (0)	RTV Burn Off Hi guys. I recently picked up some permatex ultra copper rtv and applied it somewhat liberally to my valve cover gasket when I reinstalled it in order to hold it on. When i started the car up it ran ok (a bit rough due to misfire) but there was gray-ish smoke (not white so I don't think it's residual oil) coming from behind the engine and it smelled metallic. I have no clue what it could be since I replaced the eccentric shaft sensor and nothing really burns up there. My question is: Is it possible for high temp copper RTV to have some residual burn off after its recently been applied? Or am I missing something since its rated to 700 degrees F? Any help would be appreciated since I'm scared I'm about to grenade my engine if I keep starting it.
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06-11-2017, 03:53 PM	#2
racermp Major 190 Rep 937 Posts Drives: F30 330i Join Date: Apr 2013 Location: Houston, TX iTrader: (1)	Could be some oil fell down. Rtv maybe but I've never seen it smoke or anything before.
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06-11-2017, 10:32 PM	#3
stoweboarder720 Private 31 Rep 87 Posts Drives: '11 E92 335is Join Date: Mar 2016 Location: Seattle iTrader: (0)	What I think happened is some of the permatex fell onto the exhaust manifold and is burning off, since that's pretty much the only place hot enough to exceed its temperature rating. Drove the car 3 hours today and no smoke so I think it was just that.
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06-12-2017, 03:33 PM	#4
racermp Major 190 Rep 937 Posts Drives: F30 330i Join Date: Apr 2013 Location: Houston, TX iTrader: (1)	Yea that would do that. Kinda like burning plastic.
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