Yanmar 2TNV70

[DRJensen]

I am using a Yanmar 2TNV70 from surplus center to run my ST gen head. Do you think it should be warmed up at a lower rpm when starting. I have my governor set for 2800 +/- rpm and I turn the engine over to build oil pressure prior to light off. It cranks about 15 seconds to build 40 psi, then I engage the fuel soleniod and she fires. I do bring it up to about 160 F water temp before loading it. I live in Florida so ambient temp is normally mild to DAM its hot LOL  . What do you guys think, I am doing harm to my engine? We start our fire diesel at work once a week and it comes right up to 1800 rpm, but it has an engine heater on it keeping it warm.

Thanks Dave

[Henry W]

Let the engine warm up before applying load.

If you have an engine controller let the engine warm up at 1800 to 2000 RPM until it reaches operating temp. Some engines will have a hard time to reach operating temp in cold weather without a load, but you should be fine with the Yanmar 2TNV70. Then, ramp the engine speed up to 2800 or what ever the engine is designed to run at for around one minute. Then, load it up.

Henry

[Seafarer12]

I hope you like buying starters for it cranking it that long.They aren't designed to run that long. Warming up for a minute or two won't hurt it but It really isn't needed. Most applications for these engines are constant speed so they hit it right off the bat. I have some emergency diesels at my work that go from cold to 400kw in less than 30 seconds, now thats slamming them.

[Henry W]

The Recent 2 Cylinder Yanmar and Kubota engines warm up rapidly. It won't take much time at all in Florida's climate. Seafarer12 makes a good point with the starter. They are not designed for long turnovers. If you want to pressurize the oiling system there are battery pumps available just for that application. I never felt I had a need for one because I feel it is something more to go wrong. Most wear happens on the pistons and cylinders when they are cold. Once the pistons and cylinders reach operating temperature the tolerances tighten up and wear is greatly reduced. This is why I warm the Kubota's up with no load for about two minutes. Than I apply the load. It will most likely state something like that in your manual also.

Henry

[highwater]

Just noticed this morning that SC shows only 1 of these left in stock.

Randall

[DRJensen]

Quick question about exhaust temp limits for these little engines. I used an infrared temp gun to check my exhaust temp while at different loads. At the highest load about 4500 watts the exhaust pipe metal temp right at the flange where it bolts up was 600 degrees F. With about 1000 watts it read 360 +/- degrees F. Also the oil pan metal temp was indicating the lube oil was running @ 200 degrees F at 4500 watts and about 190 degrees F at the lower load with oil pressure indicating a tick below 60 psi. I am running the Rotela 5w-40 synthetic oil. Do these temps seem to be within normal operating range???