TAMD41B Oil from Breathers

[Dazzajon]

Hi all,


I've got twin TAMD41B's and oil is leaking from the crank case breathers. I was aware of this when I purchased the boat as it was picked up in the survey but the surveyor attribited to the fact that obviously the engine already sits lower at the rear than the front and when the boat gets on the plane it's even more so.


It's not leaking mega amounts of oil, but it's annoying as it drips down the back of the engine so I'm wondering whether anyone has a solution to this?


Before anyone asks, there isn't any piston blow by or anything like that as i've checked and the oil on the dip sticks is about a quarter so not overfilled either.


Cheers
D

[jimbunyard]

On ours I moved the vented upper valve cover to the middle and added an overflow bottle (just a small plastic container from Walmart), and run the engine about a quart low, or just about halfway between the 'low' and 'high' mark on the dipstick.

[a64pilot]

An oil separator is in order, they are in the valve covers of most engines, sometimes a labyrinth and sometimes just a bit of steel wool.
Sometimes they get dirty from sludge and need cleaning out.
It is of course blow by, its the only way an engine gets air into the crankcase.

You can make one if your factory ones are in good order or buy nice ones, look in the car racing catalogues for some very nice looking CNC machined and anodized ones, but they aren’t anything but a pretty can.
One on my drag bike years ago was a Mountain Dew can that sat on the swingarm, and I had more people trying to figure out how that Mountain Dew can was used to make me go fast than anything else.
You can mount them high enough so that the drain is connected to the engine sump and you never have to do anything, or just simply drain them. On a schedule, probably no more often than oil changes.