Quote:
Originally Posted by FD7683
Right now i'm replacing all fuel injectors on my 5VZ and it's funny how loose all valve cover bolts were when I checked them. I tried to hit em with my torque wrench but with the past experience of cracking my original covers and having to salvage used ones from a junkyard, I was afraid of using my torque wrench as it wasn't clicking so I just used my open end wrench and snugged them all in an X pattern (loosened all bolts first then tightened).
My theory is the grommets get soft over time and need to be tighten every once in a while.
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The key is to check and tighten them over time because the washers do harden and shrink, allowing oil to pass the gasket, which then speeds the decline of the gasket itself.
Not 100% preventable but definitely manageable and with attention, you are able to extend the life of the VCG seal and reduce the leak potential
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