boese1978

Hey all, 350 I have replaced twice now, slight bit of oil seepage. The gaskets are really thin and kind of flimsy. I have used permatex, perhaps double up on the gasket? I don't see any cracks in the block or pump, the gasket weeps unttil it drips off the bottom of the fuel pump.
Thanks for suggestions and thoughts.

redoldsman

Did you put permatex or some kind if sealant on the bolts?

boese1978

No, just both sides of the gasket, never had this happen before and it's not my first olds, worth a try on the bolt threads?

jozw30

I've had this oil leak on most of my 455's. I've changed gaskets, pumps, tried different sealants, to no avail.....

Pretty irritating.

svnt442

Just an FYI....use either a gasket or a sealer, not both. Use a sealer where two gaskets meet, or where there isn't a gasket, but not on the face of the gasket.

boese1978

Thanks, svnt- I've tried both ways to no success,curious why you say no "stuff" on the gasket, I know the factory didn't but if it won't seal with just the gasket, what to try next? .Joz- interesting and yes, irritating- the fan blows the drip all over.....

svnt442

When I've have sealing issues with regular gaskets I've used Copper spray gasket on the face to make the gasket tacky with great success.
I learned a long time ago not to use RTV with a gasket. It tends to spread out more than you want it to and can cause issues with it getting into oil or water passages depending on the gasket you are trying to seal.

Leander

You know when we rebuilt our 425 recently, with the double roller on there, the new fuel pump internal arm grazed the top sprocket when it wanted to. Ended up putting the old one back on to avoid it. Don't know if that might have something to do with it on yours on not. Just throwing it out there.

boese1978

Thanks for the input both of you! I'll try the copper stuff next

oldcutlass

On really troublesome gasket leaks I use black or yellow weather strip cement. Coat a thin layer on the (in this case the fuel pump and block) and thin layer on both sides of the gasket, wait a few minutes, stick the gasket to the fuel pump, and then attach the fuel pump to the block. On the bolts I dip the tips into a can of plumbers pipe dope and then torque them down. Absolutely no leaks.

My442

I use The Right Stuff for applications where there is oil.

A light coat on both sides of the gasket, and let it skin over - takes 5 minutes.

Then assembly and torque the bolts.

Never have any leaks.

RetroRanger

if it can leak from the threads ive had good luck w permatex thread sealer

Ozzie

You've got a lot of good suggestions. Surely something will work. You could also check both surfaces for irregularities and/or make a new gasket out of much thicker & stronger material. There is gasket material intended to be used on high pressure connections. I was successful in sealing the one I have.