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Author Topic: Yanmar operating temp  (Read 6658 times)

Carolina Dog

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Yanmar operating temp
« on: October 07, 2013, 09:57:35 PM »
Hi everyone. Proud to say Lucky Dog is getting close to a shakedown this weekend to Ocracoke. My 3gm30 wants to run at 165-175 at 2800 RPM. At 3200 she jumps to 180-190 and stays there. I have completely cleared and reworked the fresh and raw water side of things. Even replaced the thermostat after I ran out of options. My surveyor stated he thought she should run at 160 or so at 2500 RPM.

Starts on a bump. Runs like a clock. Throws water like a hose. Runs 160 - 175... What do y'all think?

-Marcus of Lucky Dog
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Lucky Dog

Now or Never!

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Re: Yanmar operating temp
« Reply #1 on: December 05, 2013, 08:02:00 AM »
Mine runs at 150-160 at 2200-2500.
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selene

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Re: Yanmar operating temp
« Reply #2 on: December 05, 2013, 10:19:23 AM »
Bad instrument? Actual temperature could be fine, gauge could indicating incorrectly. A friend is grappling with a similar problem.  Can you borrow one of this IR temperature "guns"? Or maybe buy one and add it to the tool collection - they are about $130 at Grainger.
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Dolce_Vita

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Re: Yanmar operating temp
« Reply #3 on: December 05, 2013, 03:02:02 PM »
Or about $35 at Harbor Freight!

I've found them to be more confusing than helpful, as the "spot" temperature can vary wildly all over the engine.  You have to measure right at the temp sensor in order to make any comparisons.

As for your operating temps, I'm a gasoline / A4 guy and don't know much about diesels; but ...

In raw-water cooled A4s, they try to run them at 140 to 160. This is because above 160 salt begins to precipitate out and accumulates on the inner surfaces of the coolong system. But you give up a little efficiency running at that low temp.

In fresh-water cooled A4s, the target temp is 180.  The engine burns clean & happy at that temp.

I would guess that similar principles hold for diesels, and anywhere between 160 and 180 is good.
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@(^.^)@  Ed
1977 P-323 #42 "Dolce Vita"
with rebuilt Atomic-4

Carolina Dog

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Re: Yanmar operating temp
« Reply #4 on: December 12, 2013, 12:29:33 PM »
The shakedown cruise was uneventful and the engine offered up no surprises. 

I did use an inexpensive IR Temp Gun and as it was definitely confusing and so I am not sure. After troubleshooting some other gauges on the boat I have decided to replace the temp gauge on principle if for no other reason. I am thinking the gauge is old and unreliable. 150 - 160 at 2700 would make me very happy.

I can borrow an uber expensive thermometer from a friend and see.

Thanks for the great feedbak as always,

Marcus
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Lucky Dog
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