JB Weld silicone sealant in spark plug wells? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > The 02-09 "How-To" and DIY Section

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  #1  
Old 06-14-2019, 01:44 PM
bdc123 bdc123 is offline
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JB Weld silicone sealant in spark plug wells?

Long time reader, first time poster. I haven't found an answer to this question yet, so I wanted to ask here before I ruin something.

My '03 Envoy XL with 4.2L engine has oil leaking into the spark plug wells. Rather than replacing the valve cover gaskets, could I use some JB weld silicone sealant (or similar) to stop the leak inside the spark plug well without taking the whole cover off, or is this just a really bad idea?
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  #2  
Old 06-15-2019, 01:27 PM
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Grinder Grinder is offline
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2004 Chevy TrailBlazer LT
Indigo Blue Metallic 4.2L I6 4X4
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Location: Sunbury , Pa
Posts: 38
Its like putting a band-aid on a bullet wound.
I would repair it proper.
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  #3  
Old 06-16-2019, 12:47 PM
Grinder's Avatar
Grinder Grinder is offline
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2004 Chevy TrailBlazer LT
Indigo Blue Metallic 4.2L I6 4X4
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Posts: 38
Additional info from others

https://forums.trailvoy.com/showthre...ht=valve+cover

https://forums.trailvoy.com/showpost...3&postcount=31

https://forums.trailvoy.com/showthread.php?t=153930

https://forums.trailvoy.com/showpost...1&postcount=12
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  #4  
Old 06-19-2019, 08:15 PM
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LivNowPayL8r LivNowPayL8r is offline
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2002 GMC Envoy SLT
Pewter Metallic 4.2L I6 4X4
Join Date: Jul 2009
Location: SE WI
Posts: 3


Fix it right, fix it once.

Had my valve cover leaking so badly that it filled 2 spark plug wells and caused an engine miss... no sign of an external leak.
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  #5  
Old 06-20-2019, 02:58 AM
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rcott01 rcott01 is offline
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2004 GMC Envoy SLT XL
Black 4.2L I6 4X4
Join Date: Feb 2016
Location: Eaton, OH
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Yes..... fix it right. The valve cover gasket is a very simple repair. It might take 45 minutes at the most.
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oil leak, spark plug, valve cover gasket

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