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LARRY CATON.
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May 15, 2025 at 9:49 am #296452
Does anyone have experience with using a ThreeBond product in place of 3M-847 ? For example, to seal crankcase halves or hold spaghetti seals in place while assembling gearcases? https://threebond.com/
I’d never heard of ThreeBond, but saw it mentioned multiple times on motorcycle forums. Apparently, Yamaha, Honda, and others have sealants called YamaBond, HondaBond, etc. that folks say are re-branded versions of a ThreeBond sealant.
I contacted ThreeBond by completing a form on their website. They responded within an hour, but I feel like their Sacramento, CA representative is giving me the runaround. I asked if they could recommend a product for sealing crankcases, and he replied that they can’t and I should follow OEM recommendations. I wrote back saying that OMC is out of business, and I need a sealant comparable to 3M-847. He said that they don’t have a cross reference for 3M-847. Geeesh!
Finally, I said that I need a low viscosity sealant, resistant to oil and gasoline, suitable for assembling crankcases without a gasket, preferably with an open time of several minutes to allow for positioning and assembly. I decided to post here while I wait for a response.
1956 Johnson 15 Hp, FD-10
1957 Johnson 5.5 Hp, CD-14
1958 Johnson 5.5 Hp, CD-15May 15, 2025 at 11:30 am #296455would permatex aviation sealer work ?
Permatex 80019 Aviation Form-A-Gasket No. 3 Sealant, 4 oz. : Amazon.ca: Automotive
Joining AOMCI has priviledges 🙂
May 15, 2025 at 1:45 pm #296456I’ve never used them but Threebond products have been around for a good while and they are commonly used for sealing crankcase halves. They would work as an outboard crankcase sealer but if it’s a straight metal joint with no spaghetti seal, then I typically use Permatex anaerobic gasket sealer on my OMC motors. It works great and is a lot easier to use than the sticky, gooey, messy 3M847. The 847 can be used on crankcase halves that use a spaghetti seal but not a straight metal to metal joint. I also used Permatex Moto-Seal to seal the crankcase halves on an Evinrude motor – it’s very similar to the Threebond products.
For sealing OMC gear cases, I recommend Permatex Ultra Black. It’s WAY easier to use than 847 and seals just as well.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."2 users thanked author for this post.
May 15, 2025 at 7:29 pm #296469I’ve never used them but Threebond products have been around for a good while and they are commonly used for sealing crankcase halves. They would work as an outboard crankcase sealer but if it’s a straight metal joint with no spaghetti seal, then I typically use Permatex anaerobic gasket sealer on my OMC motors. It works great and is a lot easier to use than the sticky, gooey, messy 3M847. The 847 can be used on crankcase halves that use a spaghetti seal but not a straight metal to metal joint. I also used Permatex Moto-Seal to seal the crankcase halves on an Evinrude motor – it’s very similar to the Threebond products.
For sealing OMC gear cases, I recommend Permatex Ultra Black. It’s WAY easier to use than 847 and seals just as well.
I am with bob on this post. Those new silicone base sealers are great! The bigger the glob the better the job? Not!
dale
May 16, 2025 at 11:39 pm #296504Most snowmobile guys use Threebond
On crankcase halves “Good Stuff!”
and recommended by John at
Nutters Speed Shop.
May 16, 2025 at 11:40 pm #296507Most snowmobile guys use Threebond
On crankcase halves “Good Stuff!”
and recommended by John at
Nutters Speed Shop.
https://youtu.be/Q6OOup4vEqM?si=7qi3Ap33seRNS-dU
1 user thanked author for this post.
May 28, 2025 at 10:58 am #296842I’ll try the Permatex anaerobic sealer next time I split open one of the Johnson CD crankcases.
I used the Ultra Black on a spaghetti seal gearcase. It worked well and was easy to apply.
1956 Johnson 15 Hp, FD-10
1957 Johnson 5.5 Hp, CD-14
1958 Johnson 5.5 Hp, CD-15May 28, 2025 at 11:12 am #296844Thanks Bob,
I’m new to the game and haven’t used most of these products. When I was a teen in the 70s the Indian Head gasket sealer was the only thing I used regularly for automotive gaskets. Then they came out with the RTV silicone products. I don’t know if I did something wrong, but back then I used the RTV on oil pans and valve covers with mixed results. Now, there’s a huge variety of RTV products and I had lots of success with them when I owned a 1972, 120 Hp OMC sterndrive. The high heat version worked well on the exhaust manifold gasket and saved me a trip to the machine shop.
I saw on the Three Bond website that they too have an anaerobic sealer that’s intended for metal to metal flanges. I thought the sales rep would’ve steered me that way but he ghosted me.
1956 Johnson 15 Hp, FD-10
1957 Johnson 5.5 Hp, CD-14
1958 Johnson 5.5 Hp, CD-15May 28, 2025 at 11:30 am #296846In the snowmobile video they used Three Bond 12-11. It’s an RTV that from the datasheet (attached) seems capable of forming thin films with good performance in the applicable temperature range, chemical resistance, and blow out pressure.
1956 Johnson 15 Hp, FD-10
1957 Johnson 5.5 Hp, CD-14
1958 Johnson 5.5 Hp, CD-15 -
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