What sealer for engine assembly?

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AntietamClassicCycle
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Location: Rohrersville, MD, US
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What sealer for engine assembly?

Post by AntietamClassicCycle »

I'm finally to the engine reassembly stage on a 3 1/2 Sport. The factory manual specifies "Arexons Motorsil D" sealer. That doesn't seem to be particularly easy to find here in the US. What sealer do you guys recommend for between the case halves? With the gasket (as supplied by NLM) or instead of?

Regards,
Charlie.
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72degrees
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Location: West Midlands

Re: What sealer for engine assembly?

Post by 72degrees »

I used "Three Bond", without a gasket. Seems OK so far. See post from Evguru:
viewtopic.php?f=34&t=3812#p18814
George 350
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Re: What sealer for engine assembly?

Post by George 350 »

Hi Charlie,

If your preferred accessory store doesn't stock Threebond, look out for Loctite 5699, it is grey in colour and works really well.
Another source of Threebond is a Yamaha or Honda dealer - Yamabond and Hondabond are the same stuff.

Hope that this helps,
George.
George
350 sport 1978, 350 Strada 1978
650 Norton 1967, 650 Kawasaki 1977 and 650 Enfield 2019
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72degrees
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Re: What sealer for engine assembly?

Post by 72degrees »

To clarify, I used Three Bond Silicone Liquid Gasket Grey - TB1215. As George says - the same as Yamabond. I'd had good results with Yamabond on other jobs but found it easier to order the TB1215 on-line (from Demon Tweeks here in the UK).
EVguru
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Re: What sealer for engine assembly?

Post by EVguru »

Threebond 1215 is specified in the Cagiva era engine manual.
Paul Compton
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AntietamClassicCycle
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Joined: 15 Oct 2012 15:03
Location: Rohrersville, MD, US
Location: Rohrersville, MD, USA
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Re: What sealer for engine assembly?

Post by AntietamClassicCycle »

Thanks all. I was thinking about Hondabond 4, it's my "go to" sealer on projects like this and it appears to be the type that was used from the factory on my K2.
3potjohn
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Re: What sealer for engine assembly?

Post by 3potjohn »

I have been using some threebond grey 1184 which seems to work,very sparingly applied.I had a bit of a weep on the top of the crankcase behind the rear cylinder after having the motor apart in about 2008 (I had some hermetite gold at the time-a mistake in retrospect)so last year when i needed to do it again I made sure to clean up the cases with a wipe of carb cleaner and get this sealed.I also try and clean out the threads on any cases as they can get a bit nasty,particularly it seems the ones around the pickup area.
Only other sealant is a wipe of hylomar when fitting the sleeve on the clutch side.
good luck John
3potjohn
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Re: What sealer for engine assembly?

Post by 3potjohn »

I meant to say I don't use any crankcase gasket, just Threebond.
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