Cam Seal Leaking... still

jetmechmarty

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I posted this on Rhy's thread back in October. I'm still suffering the same leak. The leak is on the rotating shaft as opposed to the outer perimeter. I believe the seals are marked ARS. When I pulled the cover, the spring was where it was supposed to be. I have 6.85 mm clearance to the bearing. The cover & seal goes in 6.0 mm. The lip on the camshaft is beyond the seal. I must be doing something wrong, but I'm clueless as to what it is. I probably sourced the seals from Revival Parts group (MikesXS). Anybody?
 

5twins

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Yamaha originally used a 5mm thick seal here for the 1st couple years of production. Then they changed that to a 6mm thick seal. They have now gone back to selling the 5mm thick seal. MikesXS was selling a 7mm thick triple lip seal. They claimed it was better what with the extra lips, but being thicker, those extra lips may not make it onto the cam so are no help.
 

Oldfartaussie

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I was often replacing the seals with the original 7mm triple lip ones until reading the posts here about the 5mm seals. Now I use the 5mm seals and they are a lot less expensive than the oem seals from the local bearing and seal supply store. I give the cam a light clean with scotchbrite and ensure the seal is flush with the housing. I replaced every seal while I had the engine apart and now the head gasket leaks. 🤔
 

Jan_P

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I have also heard that of different thickness on seals

I have also heard from excavators

MikesXS was selling a 7mm thick triple lip seal. They claimed it was better what with the extra lips, but being thicker, those extra lips may not make it onto the cam so are no help.

It is not always as with shaving the more edges the better
What can happen if you have Double lipped seals .. is that the first one closest to the oil. Is performing keeping Oil inside.
The second lip then runs dry ( More or less ) on the axle for a while ... and wears out ..And then when first lip wears out the second one has already been gone a long time
And leaking
So Stock is the way to go if you ask me right dimensions right quality tested at the factory.
Care at the installation it can happen at times that the lip gets a cut or scratch sometimes. Extra care and of course lubrication grease
I have even used a Grinding stone in a drill to round off an entrance edge on one of the left side seals cant remember which one.
The first attempt cut the seal.

It was a fine evening ,.and a Youngster having enjoyed a couple of drinks passing by saw me standing on the knees and he believed I was drilling right into the engine block .. having lost it.
 

jetmechmarty

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As it turns out, each and every seal I’ve installed was OEM. I lubed the lip with petrolatum before installation. This is seal number three. I’m not convinced that it’s fixed.
image.jpg

This is maddening.
 

Jan_P

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Is the seal pressed in as far as it can go It looks as if the seal lip is close to the edge. on the cam
Perhaps place a socket over it there and press a little it moves rather freely ( or some light hammer blows )
Is the flat gasket on the backside " Stock " thin enough and applied on a clean surface.

Are the special washers there under the 3 Phillips screws ?
 

bosco659

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Is the seal pressed in as far as it can go It looks as if the seal lip is close to the edge. on the cam
Perhaps place a socket over it there and press a little it moves rather freely ( or some light hammer blows )
Is the flat gasket on the backside " Stock " thin enough and applied on a clean surface.

Are the special washers there under the 3 Phillips screws ?
I see the washers in there.
 
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