[C320-list] Fuel sender access

[Greg Flanagan]

I am pretty sure my Tach is correct. And yes 4000 seems high but just a short burst in neutral. I have ~ 15 years and 1800 hours on this motor. It has had no major service. I have this year replaced the engine mounts. I had to replace the water muffler 5 years ago and the raw water pump was rebuilt 3 years ago. That’s all. I do my own general servicing—oil and coolant changes, filters and belts.

 I blew out the impeller this spring (an airlock in the strainer after I cleaned it) and so l took off the alternator and and opened up the cooling tubes to check for impeller blades. They were perfectly clean, as is my exhaust elbow. I attribute this to that short burst before each engine shutdown. My engine has always started in a second. My diesel mechanic friend/advisor says it’s running perfectly and do nothing more to it.


Greg
Hoop Dancer #1076
Sidney, BC

> On Nov 5, 2020, at 11:47 AM, RONALD HODEL <ronandgail2 at me.com> wrote:
> 
> Greg, 
> 
> My manual says maximum output at crankshaft is 29.1hp at 3600 rpm. 4000 sounds a bit high. And at 2800rpm my boat speed is about 6.5 knots (3 blade Gori prop in regular pitch). I’m wondering (and I’m totally a novice at this) if your tachometer is off by a bit.) I usually run at 2500 rpm. I’ve heard of people rev ing their engine before shut down but I always thought that was to clear out their turbocharger (which I don’t have). I figure .75 gallons per hour for refueling. Thanks everyone for all the information. It’s helpful in long range planning.
> 
> Ron Hodel
> Lokomaikai #1070
> 
> Sent from my iPad
> 
> > On Nov 5, 2020, at 11:30 AM, Greg Flanagan <greg.flanagan at shaw.ca> wrote:
> > 
> > I have a Yanmar Y3M30. I too use the engine hours ~ = fuel consumption? I cruise mostly at 2800rpm (~5knots). But I run it at 3000 and 3200 for periods of time. I rev it to 4000 for a minute before shutdown after docking or anchoring. And I use the diesel furnace one in awhile. I can reliably approximate 2 litres per engine hour for refuelling. That’s about .5 US gallons. 
> > 
> > Cheers,
> > 
> > Greg
> > Hoop Dancer #1076
> > Sidney, BC
> > 
> >> On Nov 5, 2020, at 11:04 AM, Jack Brennan <jackbrennan at bellsouth.net> wrote:
> >> 
> >> Hi Dennis:
> >> 
> >> The fuel consumption chart for the Yanmar 3gm30 goes from .4 gallons an hour at 2000 to 1.6 at 3,400. At a cruising speed of 2,800, you get about .89 gallons an hour.
> >> 
> >> This gets a little tricky because you don’t want to run the diesel too slowly. That encourages carbon buildup and hastens a rebuild. Diesels want to be run hard to be long-lived. (I.E., 10,000 hours or more.) Better to burn a little more fuel and have a happy motor.
> >> 
> >> If you’re running slowly for some reason, get to an open stretch of water and crank it over 3,000 rpms for 10 minutes or so.
> >> 
> >> Jack Brennan
> >> Sonas, 1998 Catalina 320
> >> Tierra Verde, Fl.
> >> Dolphin Cruising Club of Tampa Bay
> >> 
> >> 
> >> 
> >> 
> >> Sent from Mail for Windows 10
> >> 
> >> From: Dennis Cookson
> >> Sent: Thursday, November 5, 2020 12:53 PM
> >> To: C320-List at catalina320.com
> >> Subject: Re: [C320-list] Fuel sender access
> >> 
> >> Y
> >>