Temp and Pressure 6BY260

[Lys]

Hello: We rcently purchased a new R29 "William Tell" and wish to get our relationship with the 6BY off to an amicable start.
My previous experience with a Yanmar 3YM30 is unhelpful with my immediate concerns, as are the manuals.
Some specifics would help us to heed general warnings (threats) like "avoid idling for a long period" if we are warming the engine or, to "watch for spikes in pressure and temp", without knowing what the underlying temp and pressure should be.
Purhaps someone out there could share with us his/her knowledge as to the temp and pressure readings that would indicate the engine has warmed sufficiently. Also,the temperature and pressure to expect for various cruising ranges ,such as 3200-3600rpm. Thanks

 

[rjohnson58]

It's is an old post, but I was going to ask the same question. I also have a 6BY and run any where from 191 at 2000 rpm's up to 207 at 3200 rpm's. I hope that helps. I am curious what temp others are running at too.
Y-Knot
Rick and Becky

 

[walldog]

Rick and Lys,

I am sure some of the 6BY engine owners will chime in here eventually. My 4BY180 has temperature ranges similar to the 6BY engines. That is to say much hotter than my previous R21 with the 18hp Yanmar. The BY engines by design run hotter that our previous engines. I bring it up to about 180d before going above 15-1600 RPMs. The warmer waters down here in the Gulf of Mexico off the Southern coast of Texas bring my temperatures up a few degrees above the ranges we run when we are in the Pacific North West. I run around 190-194d at 1600 RPMs. At 2000 RPMs we see about 198d. At 3200 RPMs we are in the 203-205d range. At Wide open Throttle 4000-4050 RPMs, which we run for about 5 minutes during each hour of cruising, we see around 210d. I find at the higher RPMs a small amount of debris in the strainer will cause an increase in temperature. Here in the Gulf, I have started physically opening the strainer to clear it before each cruise as a visual inspection is not good enough. Might be my old eyes.... Yanmar's high temperature alarm is well above 210d F. I do not remember just how high, as I have never set it off. These engines like to run. Long periods of idling and low RPM cruising need to be offset by short periods of high RPM runs. Check the oil, keep the strainer clear and have fun.

On Edit: We also bring the temperature back down to around 190 before shutting down. This usually occurs before we arrive at the dock.

Herb