110 YanMar

[Ainokea]

For those who have this engine model in their R-25's I have some questions.

What RPM are you turning W.O.T. and what temp is the cooling system showing. If you happen to know how many knots you are getting as well please let me know. I am trying to do some trouble shooting.

Thanks to all the Tug Nutters in advance!!

Frank

Ainokea

 

[Trinity]

Hi Frank

we turn about 3500 RPMs and the Temp guage indicates 180 degrees.

Temp is a little hard to nail down as I don't hold it at WOT for more than a few minutes.

Knots varies depending on wind, current, etc. ...I've seen anywhere from 15 to 19.

--Kerry and Nancy

 

[j&lgray]

We can run the Laurie Ann all day at 3,100-3,200 RPM because that is what Yanmar engineered the engine for. The temperature gauge is a rock solid 175 degrees. Depending upon the sea conditions we run at 12 to 15 miles per hour. WOT is about 3,500 and our speed would only be a guess, but it would likely be 15 MPH. (From all of out time on the inland rivers, we use MPH rather than knots; subtract one from all of our numbers for knots.)

By the way, the most common performance problem is a seized turbo that results in speeds of no more than 10. Since our turbo was fixed, we can run at these speeds pretty much no matter how the boat is loaded. If your temperature gauge is higher than 175, look first to the impeller before any deeper mechanical causes.

Best of luck!

 

[bbrh842]

Frank,

WOT for Tug O' War is 3400 rpm, temperature is 175.
Speed is 13 to 14 knots depending on if I can find the "sweet spot" with the trim tabs.

If you are having overheating problems at WOT, first thing to check is RPM.
If engine is overheating and not turning at least 3200 RPM, it is overloaded.
Barnacles on prop or bent blade would be most common reason.

If WOT RPM is O.K. then engine is not overloaded.
Might be Sea Water Cooling system causing overheating.
Easiest thing to check first is that sea water intake is not clogged with debris.
Then remove basket from sea strainer and look INSIDE the basket.
If sea water intake and sea strainer are O.K. then replace impeller in raw water pump.

There is an easy way to check if Sea Water cooling system is working properly.
While running at WOT, raise the step on the engine compartment and feel the metal fitting on the front of the heat exchanger. This fitting has a rubber hose attached to it that goes around the side of the engine to the mixing elbow. This is the sea water outlet from the heat exchanger. If this fitting it too hot to touch, you are not pumping enough sea water. If you can GRAB this fitting, and HOLD on to it, without getting burned, then Sea Water cooling system is O.K. The overheating problem is with the Fresh Water side of the cooling system.

Mike

 

[SPaddock]

Mike,
Can you talk about how you diagnose a seized turbo?

Thanks,
Steve

 

[bbrh842]

Steve,

I believe it was Laurie Anne that reported a siezed turbo.
However I believe I know the answer to your question.

If the engine is on, turn off the engine.
Remove the thing that looks like a tin can full of holes from the turbo inlet.
Stick your finger into the turbo inlet and spin the turbo.
It should spin freely.

Mike

 

[RICH002]

RT Tug turns 3450 with the temp a little higher about 185 after a few minutes of wot. like all the others it depends greatly on current and wind what speed we get. i have seen 16 knots with the tide coming in and the wind at our back. on a prettty normal day slack wind and tide we can get 13 to 14 knots