It is normal for a small amount of exhaust to blow-by the piston rings and pressurize the crank case in any engine. On the valve cover near the rear of the engine is a small 2x2 plate that covers an oil seperation screen. >From that assembly is a small hose that's run to the intake manifold to re-circ the blow-by back into the engine.
Take all that apart and clean all the grunge out (including the hose & port into the manifold) and your problem should be solved. Should be an easy job to do. Let us know how it works out. Eric On Wednesday, July 5, 2017, Howard and Skippy via CnC-List < cnc-list@cnc-list.com> wrote: > Hello All, > For the last few years, I had a significant loss of oil whenever I ran > the engine for more than a few minutes. During 1 run through Hell's Gate > back to home waters in Raritan Bay, the oil light and buzzer sounded > (naturally at the worst time). We hoisted the sails and sailed down the > East River - not recommended! When in Raritan Bay the wind died, I got a > tow from SeaTow back to the mooring. This convinced me to rebuild the > engine over last winter, however, after a great deal of trouble shooting > and having multiple eyes look at the situation, we noticed that the bulk of > the oil was accumulating on the side of the engine with the dip stick. The > dip stick slid in easily. Further exploration led to the conclusion that > the source of the oil leak was, in fact, the dip stick. Finding a new > replacement for an old 3GM was a task as all the dealers said none were > available. An old salty engine repair man I met at the Annapolis boat show > told me he could get one. He did. I now have a tight seal and no oil leak! > If you have an old Yanmar and it has a mystery leak, check your dipstick > for proper fit. > Howard Paul, Skipper of Knot Again 35-3 > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! >
_______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated!
