A Sleeve N Seal is a thin-walled metal ring ~1" deep with an accompanying tube of "seal". It comes with some timing cover gasket sets.

To install it, you heat the ring up in the oven on 500 degrees for 10 minutes. Then, wearing gloves, you run out to your vehicle and place it on the dampener snout (crankshaft where the harmonic balancer sits.) You may tap gently on it to get it on or use the including paste as a lube (but the paste isn't necessary as a glue because the ring fits with a very tight, interference fit.)

How do I determine if the Sleeve 'N' Seal is needed?

1 Answer 1


Run your fingernail across the surface of the dampener where the seal usually rides (you can usually see a ring around the snout of it). If your fingernail does not detect any kind of ridges (well, valley, actually), it's fine. You'll probably see the ring where the seal rides, but if you cannot feel it with your fingernail, it's fine. If there is a slight ridge there, you can usually clean it up with some emory paper. If a couple quick strokes with emory paper doesn't clean things up, you need the sleeve. If there is a deeper ridge which will not clean up quickly with the emory paper, you need the sleeve.

Something to remember about the sleeve is, when you get it, the new seal which goes in the timing cover will be a matched size to the sleeve, so will be a bit bigger than the original one would be. Do not try to use a sleeve with an original seal it will be ruined short order and you'll be pulling it all back apart to do it again.

As a side point. In these applications, the harmonic balancer can be brought in to where you're heating the sleeve. Have it set and ready to go. That will help so the sleeve has a minimal amount of time to cool. Just don't muss up the wife's kitchen, as she'll probably get pissed at you :P

  • If you don't know how to or have never used emory paper, please ask a new question and I'll spell it out for you. Commented Jul 24, 2015 at 20:07

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