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New Valve Cover Gaskets Leaking
#736842 May 31st 2018 6:42 pm
Joined: Jan 2001
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Replaced the 20 year old gaskets on the 76, the new Fel-Pro composites leak worse than the old ones I took off. Run the engine a few times hoping the heat would cause the gaskets to expand and retightened the pans a couple times, with no luck. Leaking on the rear bottom corners on both pans. I used RTV to attach the gasket to the pan, but no sealant on the head side. Any suggestions. I bought a set of cheaper Fel-Pro cork gaskets today and will try them.

Re: New Valve Cover Gaskets Leaking
Meanmachine #736850 May 31st 2018 9:39 pm
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I have had good luck with those steel gaskets with silicone coating.


Windows- they're what make a van worth owning!
Re: New Valve Cover Gaskets Leaking
Meanmachine #736857 June 01st 2018 10:01 am
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3M trim adhesive to the valve cover. Then Ultra Copper Permatex to the head. Tighten.Let cure overnight. Tighten again.


Tucson-it's a dry heat...like an oven
Re: New Valve Cover Gaskets Leaking
Meanmachine #737062 June 06th 2018 3:27 pm
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Check that the valve covers aren't warped or dented on the mating surface. Also the sheetmetal around the bolt holes often gets pulled into a peak around the bottom of the hole. When using cork gaskets I prefer to coat them entirely with rtv in a thin even layer and let it mostly dry before installing which helps them to seal, hold up longer and resist splitting from over torquing the fasteners.


75 Plymouth Voyager build in progress: 5.9 Magnum with Demon 4bbl, built 727, al radiator, custom dash, custom kayak/canoe rack, solar/inverter/deep cycle setup, helper airbags, on board air, forklift-proof rear bumper....toolbox hauler/steath camper/long drawn out project.....

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