Re: Stus-List Yanmar 3gm oil leak
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!
Re: Stus-List Yanmar 3gm oil leak
I had stuck rings and know what that looks like. Cylinder 1 and 2 were 165 and 155 respectively. 3 was ~360. I managed to get them unstuck and the last time I checked they were all greater than 400. They dipstick and HP pump shims have always leaked at the same rate. Josh On Jul 5, 2017 2:17 PM, "Bill Dakin via CnC-List" wrote: > The only time I've known this to happen on internal combustion engines was > when the combustion gas pressures passed the compression rings and passed > the oil control ring to cause crankcase pressures to force out oil spray. > Oil spray within the crankcase is normal, it is when the negative pressure > outside forces it out of filler. Now might be a good time to run a > compression test on the cylinders for the heck of it. > bd > > > 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 n >> > > > > ___ > > 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!
Re: Stus-List Yanmar 3gm oil leak
The only time I've known this to happen on internal combustion engines was when the combustion gas pressures passed the compression rings and passed the oil control ring to cause crankcase pressures to force out oil spray. Oil spray within the crankcase is normal, it is when the negative pressure outside forces it out of filler. Now might be a good time to run a compression test on the cylinders for the heck of it. bd 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 n > ___ 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!
Re: Stus-List Yanmar 3gm oil leak
I had the same leak. I was able to get a new dipstick from the local Yanmar dealer (Cook Engines). Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR On Wed, Jul 5, 2017 at 8:54 AM, 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://urldefense.proofpoint.com/v2/url?u=https-3A__www.pay > pal.me_stumurray&d=DwICAg&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H > 8p7CSfnc_gI&r=9w3G7Cf8YfQnrjmtuNxwDJYr3JMv9f1pAfgAJ9xXYQQ&m= > oqYmV54HHgbitDTDUy3Uk6XJivEO44hctfW2lb4QLzY&s=AN2mPSo1FyW6nZ > M1cACxWTrI551wqUgDNM1bwALNFFw&e= > All Contributions are greatly appreciated! > -- Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR ___ 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!
Re: Stus-List Yanmar 3gm oil leak
I experience a similar condition. Mine is compounded by the HP pump shims weeping oil. I'd be willing to try a new dipstick first if one was available and not too costly. Truly I probably only need the dipstick gasket. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Jul 5, 2017 11:56 AM, "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!
Stus-List Yanmar 3gm oil leak
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!
