On the Yanmar QM, GM, HM series there is no turbo so the suction may not be as strong or the intake pipe diameter is smaller so less force is felt on the hand. Either way, I've stopped my 3HM35F engine numerous times by covering the intake with my hand. Then again I'm not stopping it at full throttle or in a run away condition. I've heard that some engines have an emergency stop plate or emergency stop lever that is used to block the intake pipe.
I left the fuel line shut this last winter. When I started up in the spring to head over to the travel lift everything ran fine and warmed up easy...until I was just off the dock. The engine started running poorly and I immediately jumped down to open the fuel valve. The engine died anyway. It turned out that the suction on the fuel header had drawn enough air in to the Racor through tiny leaks that I had to re-prime the entire fuel system - twice! All while dead in the water and single handing it! Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Tue, Sep 3, 2019, 10:14 PM Charlie Nelson via CnC-List < cnc-list@cnc-list.com> wrote: > Finding and identifying the fuel shut-off lever is a good thing for any > skipper with a diesel axillary engine--before you need to locate it when > the engine refuses to quit--don't ask me how I know! > > OTOH, I would not recommend putting your hand over the air intake > pipe/filter housing with the engine running. > > I tried that recently on my 28 hp Beta and the suction was so great that I > had to get my hand out of there before the engine came near to quitting. > > I almost had a 3 inch diameter suction 'hickey' on my palm before I > decided to stop the engine with another method--that is when I found the > manual fuel shut-off on the engine! > > BTH, using the main fuel shut-off on the outlet of the fuel tank should > also work--but there could be a fair amount of fuel to be burned down > stream of this valve before the engine is starved. > > Charlie Nelson > Water Phantom > 1995 C&C 36 XL/kcb > > > > > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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