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I put an o-ring between the two seals on my Evanrude 140, but it causes the top seal to
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stick out above the housing about a sixteenth of an inch. Will it still hold pressure or should I
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take the o-ring out? We're talking about sealing a prop shaft seal. You've got a seal here and
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you've got a seal here. Sometimes you might get a scratch or something might eat into it. Let's say
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this outside seal with the lips out, meaning a seal is like this with lips on the outside and
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there's a spring that goes around the top of it that keeps these two in, which is what seals
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If your lips are out, they're exposed. Wrap fishing line around the prop and you don't catch
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it for a long, long, long time. You can wear a mark in the propeller. This seal doesn't do anything
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anymore. One trick that you can do, change the seals, put the seal on, put an o-ring in between
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it and then push the next seal on top of it, which is going to put that extra seal in between that
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outside seal. If it's sticking out a sixteenth of an inch, that's kind of a bit, but you might not
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have a problem. If the thrust washer for the propeller isn't hitting that, then most likely
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it's not going to be a problem