How do I remove old gasket sealant? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 12 Old 07-25-2014, 07:06 PM Thread Starter
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How do I remove old gasket sealant?

I'm replacing the stator on a 2003 Honda Shadow.

It calls for gasket sealant and does not have a fibre or rubber gasket.

What's the best way to remove the original silicone gasket sealant without damaging the engine case?

I'm thinking gentle scraping with a not-sharp blade of some sort.

Also, the new sealant recommends a 2mm to 6mm bead. I think I'm going with the 2mm bead. There's no oil immersion in that part of the case, so it's mostly to stop tiny drips that have made it through the crankshaft seal.

Ideas? What do you do?

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post #2 of 12 Old 07-25-2014, 07:44 PM
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Sometimes that sealant is pretty hard. Try the edge of a plastic scraper, maybe a credit card first. I usually go straight to a small wire wheel with a dremel. Sometimes a little paint/anodizing comes off though.

Razor blades are guranteed to scratch the sealing surface, but probably not a big deal in your case. Or on your case. No 420 for me.

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post #3 of 12 Old 07-25-2014, 07:55 PM
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You can get plastic razor blades anyplace that sells painting supplies.

They're my usual go-to solution for things like these. If the old sealant has gotten too hard, you may need to upgrade to an actual steel razor blade in certain spots.

If wielded correctly and changed often (keep at a very shallow angle, don't let them get notched), razor blades won't scratch the aluminum. Just inhale deeply and be patient...

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post #4 of 12 Old 07-25-2014, 11:29 PM
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I have an old, blunt kitchen knife that I cut and squared the tip off and beveled the end, but not to a sharp edge. Been using it for the last 30 years. I'm too casual to entertain the idea of using a razor blade.
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post #5 of 12 Old 07-26-2014, 12:26 AM
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Supposedly there's no solvent specific to silicone sealant. Napthalene, as in cigarette lighter fluid, might work better than others. I'd try butane or propane valved from a pressurized cylinder to freeze it.

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post #6 of 12 Old 07-26-2014, 07:47 AM
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A razor blade and patience. Keep the blade flat against the surface. Minor nicks will be filled when you apply the new silicone.
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post #7 of 12 Old 07-26-2014, 07:54 AM
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Acetone will soften it.

A kiwifruit knife is the best I've found. Very hard plastic and one edge is serrated.

I spent about 2 hours on the clutch side without success, then raided the kitchen and finished the job in 5 minutes.

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post #8 of 12 Old 07-26-2014, 01:41 PM
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You might try some lacquer thinner in it first to soften it. I used to use it on VW valve cover gasket sealer (Gaskacinch, I think) and it took it right off. No scraping necessary, just a wipe with a paper towel.
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post #9 of 12 Old 07-26-2014, 03:02 PM
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I used brake cleaner on a rag to get all the easily removed stuff off and cleanup after chunks were removed. I found a plastic piece of junk i had hanging around to use as a scraper and that worked ok although i like the idea of a plastic razor blade. I will have to look for those for next time.

The razor blade idea might work if your careful. I used to use that to get plastic off my chrome pipes and it didn't damage anything. Just hold it really lightly so it barely touches and at a very level angle.
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post #10 of 12 Old 07-26-2014, 07:20 PM
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Not sure about any solvent but I've always been a razor blade fan as long as the gasket surface is wider than 3/8" Anything narrower and I prefer hard plastic - I've nicked too many narrow case edges using anything metal, especially on an aluminum case.
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