Double lip seals?

[flipbro]

I bought an after market seal kit from dg marine and the seals appear to have a double lip sealing serfice springs on both sides! To me this would be a great seal for the pinion. Would hold water out if u had a bellows leak and extra sealing serfice if your pinion shaft is got a slite grove!??? Any one used them?

 

[flipbro]

Re: Double lip seals?

No one out there has ever heard or used these kit from DLG marine?

 

[flipbro]

Re: Double lip seals?

Any 1 Any 1 at all? I also noticed that the sealing lips straddle were the old seal road before and made a slight groove on pinion. From what i can see this looks like a very good seal for that purpose oil in water out if a bellows leaks

 

[Grub54891]

Re: Double lip seals?

Haven't seen them myself for that application,sounds like they woul work.

 

[fishrdan]

Re: Double lip seals?

Never used the DLG kit, but have found other aftermarket double lipped seals for Mercruiser drives that provide additional sealing, beyond what Mercruiser spec'd. I do agree, not a bad idea in my book.

 

[JustJason]

Re: Double lip seals?

The way seals work is you have to have a liquid on them (be it oil or water) or else the rubber is going to burn right up no differently than running a water pump impeller without any water to it.

Its steel on rubber spinning at 700 rpms just at idle, 4500 at WFO. What cools it? The whole reason why there is no outer water seal in the uppers is because with no water on the outside of the seal, its going to burn right up. So whatever this seal is that your looking at is either some kind of gimmick. Or that 2nd lip is really more of a dust shield. And does not fit as tight as a typical oil seal does.

 

[Fishermark]

Re: Double lip seals?

It's interesting, I just ordered a set for my Alpha and noted the same thing. I sent a message to the seller asking if there was a specific "orientation" when installing these seals. There doesn't appear to be any difference between the two sides... but I wanted to be sure so as not to install one backwards. If and when I hear for sure, I will post it here.

 

[Fishermark]

Re: Double lip seals?

Here's the reply I received from the seller (a marina who also works on the outdrives as well as selling the parts):

Generally on a double (or triple) lip seal, the direction of installation won't matter. The only exception is if there is a helix on the inside of the seal between the lips. If it has a helix, there is a specific direction because the helix slings oil back in a specific direction in case of a leak.

Hope that helps! Those kits are used by the hundreds by many rebuilders... I know you will be happy!

 

[flipbro]

Re: Double lip seals?

Justjason I thought the same thing with it burning up an all. As I have only Sean these seals in pumps and such with liquid on either side! I did buy an upper and lower kit from dlg marine and every seal in it is two sided! Fishermark do you no anyone that has used these seals personally or is there any one on here that has experience with these seals. Thanks

 

[JustJason]

Re: Double lip seals?

I have no experience with those seals. But there are 2 types of seals in general, dust seals, and oil seals. (technically there are more than 2, but I'm trying to keep it simple)

Dust seals are not designed to hold any real pressure behind them, and because of that, they do not fit all that tight, and because of that, you can run them dry and they will not immediately fail. Oil seals are just the opposite, they are designed to hold a low amount of pressure because they fit really tightly. Because of that, if you run them dry for any real period of time, they burn out. When I say "Fit", what I mean by that is how tight the rubber of the seal is squeezing in against the steel surface that rubber is riding on. A loose fit is for dust, grease, nothing that is designed to hold back any pressure. A tight fit is for water, oil, other fluids, and is designed to hold back a light amount of pressure. (typically less than 25 psi). Because the fit is tight, it must stay lubricated and cooled at all times, or it will prematurely burn out.

For example, if you have ever changed wheel bearings on an older car, or a trailer. Those seals in there are just dust seals, to keep road dirt out. And that's why you can run them without a liquid on top of them without burning up. (but they all burn up in 30 to 40k miles). But if you have ever changed seals on a differential, where there is gear lubricant behind the seals, you can see how they are of a different construction, and fit much tighter.

It's all just rubber on spinning steel.

 

[flipbro]

Re: Double lip seals?

I've changed many of seals. And know the basics. I will contact dlg and ask

 

[fishrdan]

Re: Double lip seals?

JustJason brings up a good point, about one side of the seal being run dry, especially if it has a garter spring.

The axle seals on my trailer are double lipped with the outer (water) seal not using a garter spring, but the outer seal still fits pretty tight around the axle. I bet this seal would burn up it it wasn't lubricated, but it's lubed with grease.

The aftermarket double lipped seals I've used on my drive all have liquid on each side, lube or oil, but I fill the cavity between the seals with gear lube before installation. Sounds like that's what needs to be done with the pinion seal, fill the gap as well as possible with gear lube. It wouldn't take much to keep the seal lubed.

 

[flipbro]

Re: Double lip seals?

I contacted dlg marine in Texas and the emailed me the exact to the word as fishermark posted. Hmm really wish I knew of thes being used by someone else. Seamed like a good idea

 

[flipbro]

Re: Double lip seals?

JustJason brings up a good point, about one side of the seal being run dry, especially if it has a garter spring.

The axle seals on my trailer are double lipped with the outer (water) seal not using a garter spring, but the outer seal still fits pretty tight around the axle. I bet this seal would burn up it it wasn't lubricated, but it's lubed with grease.

The aftermarket double lipped seals I've used on my drive all have liquid on each side, lube or oil, but I fill the cavity between the seals with gear lube before installation. Sounds like that's what needs to be done with the pinion seal, fill the gap as well as possible with gear lube. It wouldn't take much to keep the seal lubed.

I don't understand. I don't think I could fill the universal bellow with oil lol as I'm talking about the seal at the yoke

 

[fishrdan]

Re: Double lip seals?

I don't understand. I don't think I could fill the universal bellow with oil lol as I'm talking about the seal at the yoke

Nope, not filling the bellows.

Filling the small area between the 2 lips of the double lipped seal. So the outer seal that would ride dry has some lubrication. Wouldn't take much lube to keep the seal from riding on a dry surface.

 

[fishrdan]

Re: Double lip seals?

FWIW, I have several of those double lipped seals in my MC1 drive (triple on the prop shaft) and haven't had issues with them. I haven't had to replace the yoke seal yet though....

 

[flipbro]

Re: Double lip seals?

Nope, not filling the bellows.

Filling the small area between the 2 lips of the double lipped seal. So the outer seal that would ride dry has some lubrication. Wouldn't take much lube to keep the seal from riding on a dry surface.

Ahh ok yes thats a great idea thanks for clearing that up! Next question what should i use on the out side of the seal? it has a rubber coating so is loctite out of the question