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New Valve Cover Gaskets Leaking #736842
May 31st 2018 6:42 pm
May 31st 2018 6:42 pm
Joined: Jan 2001
Posts: 2,217
East Brady, PA
M
Meanmachine Offline OP
veteran
Meanmachine  Offline OP
veteran
M
Joined: Jan 2001
Posts: 2,217
East Brady, PA
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 [Re: Meanmachine] #736850
May 31st 2018 9:39 pm
May 31st 2018 9:39 pm
Joined: Aug 2001
Posts: 11,933
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
Maniac
Joined: Aug 2001
Posts: 11,933
Fircrest, WA
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 [Re: Meanmachine] #736857
June 01st 2018 10:01 am
June 01st 2018 10:01 am
Joined: Mar 2016
Posts: 335
Tucson,Az.
H
Hasan Ben Sobar Offline
enthusiast
Hasan Ben Sobar  Offline
enthusiast
H
Joined: Mar 2016
Posts: 335
Tucson,Az.
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 [Re: Meanmachine] #737062
June 06th 2018 3:27 pm
June 06th 2018 3:27 pm
Joined: Dec 2017
Posts: 23
State of Jefferson
L
liftarc Offline
stranger
liftarc  Offline
stranger
L
Joined: Dec 2017
Posts: 23
State of Jefferson
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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