Diesels don't like to be run at idle. Particularly Yanmars. Idling a Yanmar at idle or slow speed for long periods may cause soot build up in the exhaust elbow. It's better to operate them with a load at higher rpm.
That being said, you still need to let it warm up a few SECONDS or so to ensure good lubrication. Search the Internet, you'll find lots of articles by mechanics that debunk the myth of letting engines warm up for minutes before using. Their reasoning is that engines warm up quicker under load than at idle. Idling a cold engine actually causes more wear. However, they recommend moderate rpm until reaching operating temperature. It's a balancing act. Dennis C. Touche' 35-1 #83 Mandeville, LA On Mon, Jun 20, 2016 at 10:41 AM, Joel Aronson via CnC-List < [email protected]> wrote: > The 3GM manual: > > 1) Warm up the engine for more than 5 minutes. Because lube oil does not > reach all the > moving parts as soon as the engine is started. > Operate the engine at around 850-900 rpm for at least five minutes. > > On Mon, Jun 20, 2016 at 11:36 AM, Franklin Schenk via CnC-List < > [email protected]> wrote: > >> A friend of mine insists that you cannot warm up a Yanmar engine at idle >> speed. When we are still in the slip he puts it in gear and runs at about >> half throttle. None of the other sailors appear to do this. Unfortunately >> many do not give the engine a chance to warm up at all. I am open to >> suggestions and the reason for what you are doing. >> >> Frank >> c/c 29 >> >> _______________________________________________ >> >> This list is supported by the generous donations of our members. If you >> like what we do, please help us pay for our costs by donating. All >> Contributions are greatly appreciated! >> >> > > > -- > Joel > 301 541 8551 > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > like what we do, please help us pay for our costs by donating. All > Contributions are greatly appreciated! > >
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