Hi Bob There is a governor on the 2 and 3GM motors that can reduce or shut off fuel flow. This happened on Persistence in 2015. If it is not a fuel problem remember that there are three controls that affect fuel flow: Throttle, Fule shutoff knob, governor. Is it possible that one of these three is limited in some way?
You can likely tell if it the engine stop knob by pushing the lever that attaches to on the side of the engine, same for a throttle cable problem. I cant recall off the top of my head if you can tell if the governor lever is stuck without tearing stuff apart Mike From: Jeff Nelson via CnC-List <cnc-list@cnc-list.com> Sent: June 28, 2022 11:46 AM To: cnc-list@cnc-list.com Cc: Jeff Nelson <jhnelso...@gmail.com> Subject: Stus-List Re: Yanmar 2 GMF I guess there is one other low cost possibility...your throttle cable is somehow jamming now permitting it to open to full throttle. Fairly low chance that is it, but worth checking before you start ripping expensive bits a part. You can disconnect the throttle cable and push/pull the throttle by hand to see if it changes anything. On 2022-06-28 11:13, Jeff Nelson via CnC-List wrote: So that pretty much narrows it down to Fuel or exhaust. Have you checked your mixing elbow to ensure it is clear? Restriction would certainly keep the revs from going up. After that it likely gets expensive in either fuel supply (high pressure pump/low pressure pump) or injector issues. -- Cheers, Jeff Nelson Muir Caileag C&C 30 - 549 Armdale Y.C. On 2022-06-28 11:10, Robert Abbott via CnC-List wrote: Prop is clean....shouldn't matter if the prop is dirty, the engine won't rev above 2,100 RPM's when in neutral. On 2022-06-27 12:32 p.m., Korbey Hunt wrote: Is the prop clean? Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ ] 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. -- Cheers, Jeff Nelson Muir Caileag C&C 30 - 549 Armdale Y.C.
