No RPM past 1500 without dying

[KrisVictor]

Hello and thank you for making this such a great site.

I've been reading numerous posts and I must say there are an awful lot of smart people in here. I hope someday I may have an answer to a question.

My problem with my L2650DT-7 have me completely stumped. It may be very simple and I may just be overlooking the problem.

Without any attachments or load, my tractor will start and idle with no problem at around 450rpms. I can increase the rpm's to around 1500 before I hear/feel the engine "bog down" and the rpm drops and sometimes the engine dies. When I let up on the gas pedal and let it go back to idle, there's no problem. It idles fine.

I see no excessive smoke (black or white) except during quick acceleration which seem natural.

The fuel is gravity fed and on idle, I see air space about 1/4 inch below the top of the fuel bowl. I don't know if this is normal. I removed and cleaned the bowl and filter. I've never had to "prime" a diesel engine before but I don't think this is the issue. The tractor idles fine.

I've seen posts about air in fuel line. How do you remove this air and how will this affect the running of the engine at higher rpm's?

I've also checked the air filter. I cleaned it and will probably go ahead and replace it.

I'll be replacing the oil filter also.

Is there another filter I need to replace?

Thanks to all!

 

[Eric McCarthy]

With out a doubt it sounds like you have air in the fuel lines. What you need to do is take 2 wrenches and crack the injectors and turn the key over and pump diesel threw the lines and get the air out. Not a hard task to tackle. A set of line wrenches like you'd use on a break job for a car would be idea.

If you look here in the picture the metal tube lines going to the engine block are the fuel lines that lead to the injectors.

 

[Eric McCarthy]

Oh and forgot to mention I live in the area. I'm in the west end of Henrico so if you need to you can call me and I can more or less talk you threw it over the phone.

 

[JWB]

Just an educated guess but I would bet that the fuel system (tank, lines, filter holder ) have algae/sludge partially restricting the fuel system. Check the tank nipple for restriction. It sounds like its starving for fuel at higher rpms. Try a cleaner like CRC or stanadine. I have drained the tank, dumped the filter bowl and filled with straight diesel cleaner. Added clean fuel and the correct cleaner to the tank, bled and let it run for a while. The straight cleaner in the bowl gives the injectors a nice "shot" to help clean em. Its worked well for me in the past and doesn't cost much.

 

[kuboman]

Change the fuel filter.

 

[Bulldog]

Make sure your tank vent tube is open. If your tank can't get air in it won't let fuel out like it should. It will just barely let enough thru to let the engine run.

Your idle speed sounds like it's to low. I believe it should be around the 650 -800 rpm range, both of mine are. A higher idle is better for the engine. First start up idle rpm during warm up time is suppose to be done at half the rated rpm, basically 1200-1500 rpm.

 

[Rust Addict]

There are 2 fuel filters on a B6000. One is referred to as a water seperator and has the sight glass bowl, and replaceable paper element type cartridge. The other is an in-line hose clamp automotive style filter. Factory set-up to have both. If you've never changed them both, good idea to start here. Once the filters are clean, try a can of fuel injector cleaner mixed to a high concentration in the fuel tank. You probably have two air bleed points, one a the injector pump, and one a the fuel bowl shut off. Bleed the lines at each point after each filter change. Good luck.