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B18 flame trap

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Old Jun 23rd, 2022, 14:11   #1
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Default B18 flame trap


I'm retrofitting the full crankcase breather system to my B18. The secondhand breather box that bolts to the side of the engine has a small brass mesh on the air intake pipe. I can't find a part number for it (or proof of its existence in a B18 context) anywhere. I also have a crankcase breather valve, part number 418982, which is effectively a one-way valve. As the brass mesh looks like its seen better days, can I remove it as I'm guessing that the breather valve is all I need?
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Old Jun 23rd, 2022, 15:53   #2
Ron Kwas
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That "Flame Trap" is a standard part of the Oil Trap looks fine, and it gives any oil droplets lots of surface area on which to precipitate out, fall back into the Oil Trap, and make their way back to the Crankcase...I'd leave it as it is after cleaning the OT with mineral spirits.

The "one-way valve" is aka the PCV has a preferred attitude of installation, because of the low force spring applying the force on the internal shuttle (should/must be vertical!)...that is why it is typically located right above OT in the B18 installation.

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