FWIW, I had a "dry exhaust" a few weeks ago and found we could test the exhaust riser elbow by pulling off the 2" exhaust hose and then with the stop cable pulled, we turned over the engine to see water spitting out the exhaust riser into a bucket. On my Universal M4-30, it proved the exhaust injection elbow and riser were fine.
Sidenote: I wound up replacing the entire 20 feet of 2" exhaust hose because it was 33 years old and all the cooling lines which I had installed twenty years ago. About $500 for hoses and clamps but well worth it for much peace of mind. My original problem was the raw water pump bearing assembly, which allowed the pump shaft to dissengage from the engine. $140 in parts got that fixed and all was good again. Chuck Scheaffer Resolute 1989 C&C 34R Annapolis > On 06/26/2022 9:49 PM Tom Buscaglia via CnC-List <cnc-list@cnc-list.com> > wrote: > > > Yanmar exhaust elbows are evil. I’ve has Alera for 10 years and am on my > third. > > Tom Buscaglia > S/V Alera > 1990 C&C 37+/40 > Vashon WA > P 206.463.9200 > C 305.409.3660 > > > > > > On Jun 26, 2022, at 6:00 PM, Rod Stright via CnC-List > <cnc-list@cnc-list.com> wrote: > > > > > > > > > > If replaced should be good just a common problem with > the symptoms you described. > > > > Rod > > > > Sent from my iPhone > > > > > > > > > On Jun 26, 2022, at 9:50 PM, Robert Abbott > > <robertabb...@eastlink.ca> wrote: > > > > > > > > > > > > > > > > Rod > > > > > > Mixing elbow, muffler (from small SS to larger resin) and > > > exhaust hose were all replaced a few years back. I'd be surprised if the > > > problem was there. > > > > > > Rob > > > > > > > > > > > > On 2022-06-26 2:59 p.m., Rod Stright wrote: > > > > > > > > > > > > > > Mixing elbow can cause problems like you experienced. > > > > > > > > > > > > > > > > From: Robert Abbott via CnC-List > > > > <cnc-list@cnc-list.com> mailto:cnc-list@cnc-list.com > > > > Sent: June-26-22 12:40 PM > > > > To: Josh <muckl...@gmail.com> mailto:muckl...@gmail.com > > > > ; Stus-List <cnc-list@cnc-list.com> mailto:cnc-list@cnc-list.com > > > > Cc: Robert Abbott <robertabb...@eastlink.ca> > > > > mailto:robertabb...@eastlink.ca > > > > Subject: Stus-List Yanmar 2 GMF > > > > > > > > > > > > Bottom and prop is clean....boat is launched every > > > > Spring after Winter layup. > > > > > > > > Checked the throttle cable and that seems to be > > > > fine....most likely a fuel issue.... > > > > > > > > On 2022-06-26 11:44 a.m., Josh wrote: > > > > > > > > > > > > > > > > > > Is the bottom and prop clean? > > > > > > > > > > > > > > > Jun 26, 2022 09:39:09 Robert Abbott via CnC-List > > > > > <cnc-list@cnc-list.com> mailto:cnc-list@cnc-list.com : > > > > > > > > > > > > > > > > > > > > > > > > > > > > Went to take the boat out Friday for a > > > > > > short sail .....motoring out heading into a12 knt breeze....started > > > > > > to increase the RPM's and found the engine wouldn't rev about 2,100 > > > > > > RPM's ....marine diesel's are not supposed to be that complicated > > > > > > but they are to me. I wouldn't know where to start to trouble > > > > > > shoot....getting a mechanic to deal with it this week. I spoke to > > > > > > him and told him the situation and he thinks it is a fuel > > > > > > problem....engine not getting enough fuel....my fuel tank and fuel > > > > > > should be clean as I had the bottom of it replaced 2 years ago and > > > > > > the 2 fuel filters replaced. He thinks one or both of the filters > > > > > > are restricting the fuel flow.....I hope he is right but I don't > > > > > > think so. > > > > > > > > > > > > Possibly many are causes....restricted fuel > > > > > > injectors, fuel pump, etc. ....the engine has never been serviced > > > > > > in the 16 years I have had the boat > > > > > > > > > > > > Any insight or guidance to help greatly > > > > > > appreciated. > > > > > > > > > > > > Rob Abbott > > > > > > AZURA > > > > > > C&C 32 - #277 > > > > > > Halifax, N.S. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
