Hi everyone!

Got a question. Is the gasket in the link below for the oil pump to main cap? My engine is Olds 455.

http://www.summitracing.com/parts/fel-13458/applications/make/oldsmobile/engine-size/7-5l-455

If i don't use a gasket do I just bolt the pump without any sealer or what sealer should I use.

Below are two other gaskets I found but not sure if any gasket is required.

http://www.schumannsdynamicperforman...ng-gasket.html

http://www.mondellotwister.com/PB-300.gif

 

No, that summit gasket is the oil pump housing to oil pump cover gasket.
No gasket/sealant is needed for oil pump to main cap mating surface

 

http://www.schumannsdynamicperforman...ng-gasket.html

that is a oil pump to main cap gasket, with the oil pump pick up to oil pump gasket.
The gasket for the pump to main cap is a very thin copper gasket. I have seen one, but have not use it yet. Something new that some one think is needed.
From the factory it is metal to metal, no gasket used.

Gene

 

I just saw this thread and have the same question on the 455 I am building. My gasket kit came with NO pump to main cap gasket. My shop manual is no wealth of information on the topic. Is the pump to main connection truly metal to metal? Would obviously leak but seems to me it would be so minimal that it could not affect the oil pressure.

 

Leak?

To where? The oil pan?

Certainly not enough volume in such a leak to affect the pressure in the engine.

The factory engineers did not use a gasket there.... hint, hint.

 

The oil pump to main cap doesn't use a gasket, nor is one needed. The surfaces are both machined flat, there is no place for oil to leak. The mondello part is baffle to keep oil from climbing up the back off the oil pan. It just happens to use the pump to cap mounting surface as a place to bolt it in. If a gasket was needed you can be sure the Olds engineers would have included one.

 

Just bolt the pump onto the cap. No reason to worry. You are falling victim to the mantra "there is no end to concern."

 

I am currently redoing my oil pump and it looks like there are fragments of this gasket after I took off the plate to the pump. That is where this gasket lives. All my internal parts are fine but they don’t just sell this gasket anymore by itself you have to buy it as a set. When I looked at some information about oil pump designs it says metal gaskets like these were used to creat pressure. As my initial thought was what is it going to leak if it sits in oil. It leaks air— pressure. Again if the metal is pretty flat there shouldn’t be much room to cause an issue. I was going to just spray a copper coating on each said and put a little more lbs of torque on the bolts… any alternative suggestions. For a couple bucks I would have said it’s worth the safe guard but for the kit. I mind as well grab a new oil pump.

 

This is a twelve year old thread but for starters ....... which engine are you working on ? As far as I know only the diesels used a gasket there. Is there a part number on your pump ?

 

The link at the beginning of thread shows the gasket the person was initially inquiring about and where it goes. I am working on a 350 Olds gas. I think the melling oil pump is commonly used in olds.

 

Ok but you mentioned a gasket between the plate on the oil pump and the pump body ? Normally there is no gasket there and no sealer is needed.

 

When I took mine apart it looked like one was there but pieces and missing parts. But I don’t think I am going to replace the gasket. I was thinking of spraying with a copper spray but sounds like I just need to make sure it’s a flat seal. Thanks

 

There is a specification for clearance between the bottom of the rotors (gears) and the bottom plate of the oil pump; thus the need (sometimes) for a thin gasket there. That spec is found in the CSM. In my 1967 CSM that spec for all V8 engines is 0.0025 to 0.0065 inches.

 

I am not sure how I would measure the gap but the pump doesn’t turn when everything is back together and tight. I believe it is for clearance and I am curious if newer internals will keep everything from sliding around too.
This is where the gasket goes.

This is where it mounts to engine

This is where the pickup and the spring goes