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it says crankcase drain (tube) so it must do something like the purge valves on older cd ad qd series of motors
sends unsued fuel oil mix from the crankcase down and out the exhaust route… At idle fuel oil vapours don’t make it all to the cylinders for combustion and accumulates in the cc so it gets pushed out on the next down stroke crankcase build up of pressure.
I would not replace a tube with a brass rod piece
or something else 🙂
Joining AOMCI has priviledges 🙂
possible but wouldn’t the bearing self oil themselves from fuel/oil vapors ? circling inside the crankcase ?
Yea you are correct about that…would have to see the block/tubes …see where they come from and go to, to understand what they might be for. I’m sure there’s someone out there that works on the newer OMC’s that knows. It’s weird that they are called drain tubes in one line and metering rods in another.
Thanks everyone. I will purchase the plastic ones just to be safe.
I did trace where the tubes go to and from. They start at the top bearing (not sure if its below or above bearing since case is together) which is where the top metering rod goes then through a hole in the reed valve plate into the front of the top of intake manifold then down a C type canal to the bottom of intake manifold then through a hole with a screen on the reed plate then down the other hole where the bottom metering rod goes in crankcase just below the bottom bearing.
Thanks,
Joe
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