Oil & Fuel RPMs at Diesel Start-up

firemanpat2910 · Mar 23, 2006

Wow why would you get on a tractor at -22 ? better yet why would you live some where that gets -22? the temp here yesterday was 90 but this morning there is some rain and its down to a shivering 59. time to break out the jackets.

On a serious note I set hand throttle to idle and turn the key if it spins for what seems like long enough with out starting
I will step down on foot throttle. If that doesnt work I remember to push in the kill switch and start her right up

Soundguy · Mar 23, 2006

I do what Toadhill does. I set the rpm between 800 and 1000 when I'm idling it to cool, then shut her down. This si the same throttle setting i use for startup, except that once started.. if it is under 1000, I'll bump it to 1000 to let it warm.

Soundguy

daTeacha · Mar 23, 2006

( Wow why would you get on a tractor at -22 ? better yet why would you live some where that gets -22? )

I have to ask why anyone would want to live in the tropics. I prefer cold weather to hot. My daughter, on the other hand, seems to think 80 is beginning to get comfortable. I've seen -27 F on the thermometer here in Ohio. When I lived in Michigan, that wasn't worth commenting about. I got in my car one morning up north of Grand Rapids and the seat vinyl split down the middle instead of flexing. Folks up there keep their fuel oil tanks in the basement because the stuff gets too thick to flow when winter gets serious. /forums/images/graemlins/smile.gif

flusher · Mar 23, 2006

That's more or less what I do. But I worry about wet stacking, so I limit my time at idle (<1500 rpm) to no more than a couple minutes.

I didn't know squat about diesels when I bought my B7510HST last May. But reading lotsa threads on TBN made me leery about idling a diesel for long periods.

BTW: how important are the warm-ups and cool-downs for a 21HP diesel like the one on my tractor? Are thermal stress concerns more important than wet stacking? Is wet stacking more of a problem with stationary diesels (e.g. diesel generators) than with diesels in tractors/construction equipment/ trucks/cars?

Highbeam · Mar 23, 2006

"I start my Kubota at probably 1/4 throttle or less. RPM gauge shows around 1200 typically once it cranks up. I let it warm up at between 1200 & 1400. Then it's off to play, I mean work."

This is exactly what I try to do. I always cool down before shutting off at 12-1400 and then always move to low idle before shutoff. Since I move to low idle for shutoff, I have to guess at 1200-1400 for startup.

My mornings are always above 20F and even in the summer I cycle the glow plugs at cold start.

Soundguy · Mar 23, 2006

( That's more or less what I do. But I worry about wet stacking, so I limit my time at idle (<1500 rpm) to no more than a couple minutes. )

That's probably on the shy side if you are worried about slobber and wet stacking..

( how important are the warm-ups and cool-downs for a 21HP diesel like the one on my tractor? Are thermal stress concerns more important than wet stacking? Is wet stacking more of a problem with stationary diesels (e.g. diesel generators) than with diesels in tractors/construction equipment/ trucks/cars )

I'd say the time frame is very important. My NH 7610s tractor.. a big(er) diesel has stickers all over it.. "WARNING" do not operate at over half rpm for 5 minutes to allow proper hydraulic and other systems time to circulate and warm up". And of course, for shut down.. " CAUTION" idle engine for 5 minutes before shut down if you have operated at full throttle".. goes on to say that this is for proper cooiling of the turbo, so that oil doesn't coke up in it's bearings.. so.. I'd say read your manual, and follow thier advice... Turbo repalcement is expensive.. been there, done that... years ago..

Soundguy

George2615 · Mar 23, 2006

A shivering 59 degrees? Here in Upstate NY that's t-shirt and shorts weather. If its above 40 its time to get the motorcycle out for a ride.

As far as the tractor goes I start at idle and bump up to about 1200-1400 RPM until warmed up. I also have a lower hose inline heater so it doesen't take that long.

KiotiJohn · Mar 23, 2006

Not that this thread needs another response, but I want the oil in my engine to get around quickly when I start, so I set to about half total RPM which is around 1500 +- and let it warm for 5 minutes.
Half throttle is a good spot to get good fuel and oil flow for the warm up without causing any extaneous problems.
John

firemanpat2910 · Mar 23, 2006

George I remember those days, grew up in North Syracuse
Dont miss cold weather at all. I have an Uncle that lives in Central Square.

George2615 · Mar 23, 2006

Totally off the topic but had to respond back to you. Its a small world. I too lived in North Syracuse in the 80's Moved to the Square in 90. Also use my tractor on some property I have in West Amboy north of Panther Lake. Visited my inlaws in Ocala, Fl. about 10 years ago. We went out to breakfast in shorts and t-shirt on one of those 59 degree mornings. I couldn't figure out why everyone was staring at us nor could I figure out why they were wearing jackets.
George