1250 charge pump swap help

[DownNdirt]

I am halfway through swapping my 1250's non ported pump for a ported pump so it is easier to lift attachments. One question is which way does thd cork gasket go on? It's the only thing holding me back from getting it done. Thought i heard it goes on adhesive side to pump, but can't find where i heard it. Any help is appreciated.

[DeltaCub]

Clean mating surfaces!! Apply sticky side of new gasket to pump. Reassemble and have fun!

[J-Mech]

Originally Posted by DownNdirt

I am halfway through swapping my 1250's non ported pump for a ported pump so it is easier to lift attachments. One question is which way does thd cork gasket go on? It's the only thing holding me back from getting it done. Thought i heard it goes on adhesive side to pump, but can't find where i heard it. Any help is appreciated.

I usually stick it to the pump, but it doesn't make any difference which way it goes. It's a cork gasket. As long as the holes line up, and the drain hole is at the bottom, it will work. If the hydro doesn't have a drain hole, install the gasket so the drain hole is at the top. Pretty simple.

[johncub7172]

I've had much better luck sticking it to the pump. The pump has a much more noticeably smooth surface. If you look at the stick side of the gasket, it too is agreeably smoother that the non-stick side. The cast iron section on the trans axle is not as clean cut as the pump,... giving the non-stick side of the gasket a better chance to mate for a better seal.

Something to think about

[J-Mech]

The sticky DOES NOT make a seal. It is just for holding the gasket in place until it is crushed, thus making the seal. Where it is "stuck" is irrelevant, as that adhesive does nothing to seal it. It's just to make installing the pump easier because the gasket doesn't just fall off during installation.

[johncub7172]

Originally Posted by J-Mech

The sticky DOES NOT make a seal. It is just for holding the gasket in place until it is crushed, thus making the seal. Where it is "stuck" is irrelevant, as that adhesive does nothing to seal it. It's just to make installing the pump easier because the gasket doesn't just fall off during installation.

. I’m saying that there are two differences between the pump surface and the cast iron surface that is fact. When you look at the stick side of the gasket it too is more smooth than the opposite side. So I have to believe two of the smoothest surfaces are going to yield the best seal which to a degree has some merit to it. Not so much that the stick side seals anything.

[johncub7172]

I just did not have the outcome I was expecting when I stuck it to the cast iron the first time. Also some say the gaskets are slightly thinner. We all seem to agree it’s best to place it on the pump first. Again not debating anyone’s good judgement. My own experience having done this a number of times!

[J-Mech]

Originally Posted by johncub7172

. I’m saying that there are two differences between the pump surface and the cast iron surface that is fact. When you look at the stick side of the gasket it too is more smooth than the opposite side. So I have to believe two of the smoothest surfaces are going to yield the best seal which to a degree has some merit to it. Not so much that the stick side seals anything.

One is cast iron, and one is aluminum. Both are machined surfaces. To the gasket, it makes no difference. The gasket is smoother on one side, because it has a film on it with adhesive. Again, the gasket doesn't care which way you mount it, John. IT MAKES NO DIFFERENCE as far as it's ability to seal. You say you have installed several..... great. I've installed thousands of gaskets. I only agree that it is easier to stick it to the hydro because it is easier to center it than it is to center it to the rear end. But the ability for the gasket to seal has nothing to do with which part you stick it to.

[johncub7172]

Might be a good question for the tips or FAQ section.