Here is the skinny: I have a Pisces marinized Isuzu 2ba1 2 cylinder 27hp diesel
with around 2400 hours that does not have the crank case breather routed to the intake horn (factory set up, not modified). There is a small amount of blow-by causing a bit of smoke in the cabin
when running. My plan to correct this (re-ringing is not an option right now and there is no power loss or other issue with how the engine
runs) is to install a new blower and vents utilizing 4" hose instead of 3", and to fabricate a metal hose and attachment points connecting the breather to the intake horn. My questions are: 1. Should the mushroom breather be replaced with a sealed connection linking the breather tube to the intake, or should I fabricate a tray under the mushroom for the tube to the intake, allowing it breathe at atmospheric pressure? Is there something about the design of this particular engine
being the reason for this not being done at the factory? 2. Am I setting myself up for a potential runaway caused by the oil
vapor from the crank case the engine will now be breathing? Thanx for any knowledge/advice shared!