Yea I did that today and started it up and it sounded fine. However I didn't put it in gear or take it out of the slip. The racor was full and I didn't see any water in it either.
Now it does vibrate pretty good under operation. I looked at the engine mounts though and none seemed to be cracked or anything. What should the mounts look/feel like? How much vibration while running should it have? On Sat, May 26, 2018, 6:50 PM Josh Muckley via CnC-List < cnc-list@cnc-list.com> wrote: > Kevin, > > Fill the fuel tank with 6 to 10 gallons of fresh fuel, try it out, and get > back to us. Check your racor filter for air. Low fuel/air in the > line/water in the line can all cause rough operation. These Yanmars have a > lot of backlash in the engine and when you get rough operations the clutch > plate springs can bang. If you have a loose/broken/soft engine mount it > can allow the engine to bang around pretty good too. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > > > On Sat, May 26, 2018, 2:30 PM Kevin Paxton via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Hey Everyone, >> >> Well we were lucky enough to be able to take out our 34 this past >> Wednesday for the Blue Angels show in Annapolis. On our way back our Yanmar >> 3GMF would occasionally make a knocking sound. I'm hoping you guys might >> know what could have caused it. >> >> When it happened: >> * We were about to enter into the mouth of the Magothy and I was taking >> down the main. My wife had the helm and yelled up saying that something >> didn't sound right with the engine. She throttled down and when I got back >> everything sounded ok. She said that it sounded like it was going to die. >> Like it was running out of fuel. >> * We kept it running slowly for a bit without issue. Then I tried to >> speed us up again. After about 5-10 mins it started making the noise again. >> To me it sounded like a loud knocking or banging sound. I immediately >> reduced power again and it immediately went away. >> >> Conditions: >> * At the time it started occurring we had about 1/8 of a tank of fuel. >> * Heavy, choppy waves for a large portion of our trip due to lots of >> power boats. However, at the time it occurred, seas were calm. >> * At start up after we sailed for a bit the prop had trouble opening and >> I had to reduce power a couple of times to get it to open. >> >> Observations: >> * I didn't see anything incorrect or worrysome during operation. >> * No leaking oil, fuel, or water. >> * Racor water separator doesn't show any water in the bowl. A little gunk >> in the bottom but not much. >> * When power was reduced, everything sounded normal and operated normal. >> >> Thoughts/Questions: >> * Could low fuel/dirty fuel/water in fuel make this happen? >> * Could this be more of a vibration from the prop not opening properly? >> If that's the case, could it be indicative of something in the strut or >> cutlass bearing? We have in the past had A LOT of problems with the prop >> not opening. >> * I did notice that during operation on the way back that occasionally >> the undulation of the waves caused some stress. I'm assuming just because >> of stresses on the prop. >> >> Today I filled up the tank and started it up in the slip. It started >> immediately and didn't sound like anything was wrong. I brought the >> throttle up and down and everything sounds absolutely fine. So I'm at a bit >> of a loss as to what to check/do. I do know that I still need to change the >> oil and I am planning on changing the fuel filters as well. >> >> I did notice that I am able to see the notch in the prop shaft where it >> meets the gearbox. There does not seem to be anything on the shaft that >> would indicate that it shifted at all though. Is this normal? >> >> Would love some help from some of the yanmar experts on here please. >> >> Kevin Paxton >> '82 34 #473 >> Japhys Spirit >> Cornfield Creek, Pasadena, MD >> _______________________________________________ >> >> 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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