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Old 02-05-2006, 12:55 PM   #1
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Default Nosedrive seal observation

The last time I rebuilt a supercharger (before this most recent rebuild) about 6 months ago, I used a high performance VITON seal. It leaked for quite awhile, at a very slow non-scary rate before it 'settled in' and sealed properly.

The LAST rebuild (last weekend), I rebuilt another SC with the same number of miles and used the less-expensive NITRILE seal. No leaks whatsoever.

My theory is this:

On higher-mileage nosedrives, the OEM seal will wear a small groove in the input shaft (call it POLISH instead of WEAR if you like). The high-performance VITON seals seem to be too wear resistant, and don't let the seal 'settle' into the groove as well as the Nitrile.

Something to think about when ordering a new seal or nosedrive rebuild kit.
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Old 02-05-2006, 05:00 PM   #2
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Wilwren...You are correct in your assesment regarding the behavior of the seal material. That is the reason why I used the double lip version of the Viton seal and did not expereince any leaks.
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Old 02-05-2006, 05:33 PM   #3
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Sounds like the consensus would be to stick to the Nitrile, or the DOUBLE lipped Viton. Not the single-lipped Viton.

I'm happy with the Nitrile this time around. We'll see how it goes long-term, but I didn't have the INITIAL leaks this time. That'* a good start.
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Old 02-05-2006, 05:39 PM   #4
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Where did you source the double-lipped? A local bearing distributor?
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Old 02-06-2006, 03:17 PM   #5
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At work, i stock all kinds of seals
Viton, Nirtle, all that good stuff..Vitons we use mainly for Pinion seals in some cases a speedi sleeve is used as well to bring the shaft size back up to spec...
Im kinda supised that Viton leaked before hand and then stopped..hmm
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Old 02-06-2006, 03:44 PM   #6
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I've had different experiences replacing the nose seals.

I've replaced 2 seals with the double-lipped Viton versions, and neither leaked. I doubt that the 2nd lip affects whether or not it leaks, because it'* just a dust shield.

I've replaced 1 seal (on a 3rd unit) with the single-lipped Nitrile version, and it didn't leak initially but began leaking after few hundred miles, and still leaks a small amount every few hundred miles, so I keep an eye on it regularly.

I wonder if the leaking might also have to do with the oil level, and the internal pressure at certain temps and RPMs. I suspect this because after I rebuilt the one with the Nitrile seal (but before I installed it) I added another 1/4 bottle even though the oil level was at "the bottom of the threads" before and after adding the extra 1/4 bottle. I haven't added any more oil to this unit since it began leaking a couple of months ago, and the level is still at "the bottom of the threads".
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Old 02-06-2006, 03:47 PM   #7
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Tossing this in to go with the extra 1/4 bottle theory.

When I have read up on the M90...the little cap at the end is called a breather by all documentation. I didn't look or pay enough attention to understand if it was allowing anything to breath....

Anyone?
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Old 02-06-2006, 08:16 PM   #8
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The seal I got was from a bearing/seal supplier that carries MIL-Spec and aerospace seals. Yes, there are double lip seals that one of the lips act like a dust shield. However, this particular Viton seal is a real double lip seal used for shafts that carry high pressure hydraulic fluids and which by design, needs to have a very low leakage rate. Next time I go to the shop, I will retrieve the part number. and post it. I think I paid around $12.00 for the seal.
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