Leaking Crankshaft Seal.

[The Boat House]

I don’t work on motors new enough to have
crankshaft seals very often. I just change
them when I do. The reason is that is what
people here say is best to do and after 47
years of marriage I’ve learned to do what
I’m told. I’ve seen Mumbles leaking
crankshaft seal video several times so I put
some oil around this seal to see what would
happen and I got exactly the same thing.
When the parts came and I decided to do
another video with my still camera. Its video
option is better for close-ups than my video
camera. Here are the videos.

https://www.youtube.com/watch?v=i75feumBrgU

[chris-p]

Looks like the new seal fixed her up nice!

[fleetwin]

Mumbles video is great, but can be confusing when it comes to some of those OMCs with the crazy drain system used in conjunction with the upper seal..Personally, I feel this design is flawed but I guess it must have worked out OK because the engines were reliable.
But, you will always see leakage when performing the test Mumbles shows on one of the OMCs with this crazy system because there is no oring sealing the outer part of the upper bearing to the crankshaft. The vacuum port is there to catch any of the residual oily residue that "blew by" the upper bearing….

[Mumbles]

What you see in my video is the top of the pressed in lip seal so any blow-by past the bearing or thru the rollers would be trapped below it and exit thru the drain. The bubbles are caused by crankcase pressure getting past the worn lip.

https://www.youtube.com/watch?v=cXt6fV6Z5rc

On a twenty horse motor I’m currently working on, I poured some fuel mix over the top seal and it drained into the crankcase before I could turn the motor over. That’s why I like testing them this way, it’s quick and reliable.

[The Boat House]

quote Chris_P:

Looks like the new seal fixed her up nice!

That is the old seal in both videos.
Seems that the oil soaking on it for
a few weeks swelled it up at least.
Probably would have been OK.
I don’t think the oil is going to do
much for the lower seal however.
We’ll see.

[seakaye12]

Many many years ago I had a 1965 Ford Station wagon with the "Select-Shift" auto transmission. Over time it would take longer and longer "to go into gear" on a cold morning. I’d put it in "drive" and nothing would happen for perhaps 10 seconds. Then it would engage and be fine for the rest of the day.

A friend suggested one of the "mechanic in a can" products called Trans-X. I was skeptical but what did I have to lose? I was amazed at how well it worked; and almost instantly. The benefit lasted until I sold the car years later.

I was amazed; these products really do have the ability to soften old seals. Here’s Trans-X

http://www.crcindustries.com/products/t … 015×6.html

[joesnuffy]

I love to see this particular video and the one before on seals. Just an eye opener especially when you can’t get an outboard dialed in. In my humble opinion.

Joe

[Author]

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