2010 R29 overtemp alarm?

[billrh42]

I recently acquired our 2010 R29 Ranger Tug. We've put about 30 hours on the boat so far and there have been two occasions when the Yanmar engine display kicks out an alarm that can't be turned off unless we turn off the engine and restart it. The display says "check engine" with no other information. In both cases I was running at 3600 rpm and the engine temp was at or above 199f. I've been told that Yanmars run hot and they like it there but I'm wondering if the temp hit 200f and that is what set off the alarm. I've checked the oil and coolant water (both at the radiator cap and the overflow container) and all is well. Once the engine is restarted there are no issues but in both cases I lowered the rpm to 3200-3300 and kept the temp at 198f or below. This happened a few days ago and the boat was fully loaded (water and fuel) for an 11 day trip, in this instance I was only at 3600 rpm for less than a minute before the alarm went off.

Is 200f to hot for this engine or is the issue something else?

Thanks for any advice....

-Bill

 

[jerrygeisenheimer]

Bill I have the same problem with my R29 2010. The code indicates low oil pressure which is in error. The oil pressure is normal and like you the check engine alarm goes off only at very low rpm. I had the Yanmar dealer attempt to solve the problem to no avail. Currently living with the problem but have a supposed diesel expert on the case. If I find a cure will post it.

 

[Osprey]

The thermostat fully opens at 205 F. An audible alarm sounds at 226F or more. 200F is okay.

 

[jeffhowell1]

I have R-27 with Yanmar 4BY2-180

Two notes:
Bill mentions coolant water, Coolant should be YG30R
I was told by Yanmar mechanic early on that coolant should be filled to cap at engine, not overflow tank.

Jerry mentions low oil pressure reading, I had same problem last year, it was caused by bad oil pressure sending unit.
I had it replaced, and all is well well on oil pressure reading since then.
Part is pretty inexpensive, but I did have it replaced by professional mechanic

 

[SkookumR29]

Osprey is correct about those factory-stated temperatures, so your alarm is not likely a temperature problem. We have a 2011 29 and I have learned that those engines had an oil pressure sensor issue in the early days that was resolved by replacement of the oil pressure sensor. Try calling Gallery Marine on Lake Union in Seattle; they had quite a bit of experience supporting Fluid Motion and Yanmar regarding warranty and other technical issues on the BY engines.

Gallery Marine
206-547-2477
Irvin Pritchard

They are also a good resource for general Yanmar service. I recently had the cooling systems on our BY260-2 fully refreshed (heat exchangers pulled/cleaned, all new hoses, new raw and coolant pumps, etc.). They did a great job for us.

 

[billrh42]

Great feedback. Thank you all.
During the purchase process the original owner mentioned the oil pressure issue. He had it worked on back when the problem was discovered. Replaced the sender unit, changed the position of the ground wire, etc. None of those actions really fixed the problem so I'm left with an intermittent oil pressure reading. I'll be following up with Gallery Marine as it would be great to get this issue fixed.

Thanks again everyone.
-Bill