Bob Cat skid steer with 1011 Duetz diesel

Animal

Well-known Member
I have a friend that owns this machine, when it is cold it runs well as it warms up it starts running bad until it dies and wont start until it cools down. This problem just started this past week end when our temperature got to 80 degrees. When you start this machine the block seems to get hot fast and the oil cooler hoses are cold. Is their a thermostat that can go bad with these oil cooled motors, or can they air lock in the oil cooler? Any help would be very appreciated.
 
Yes there is a thermostat on them. It is located near the oil cooler lines on the block. There is a series of pipe plugs. I believe it is the top on. Never really did se any issues with the thermostats in them. When it is losing power and dies what color smoke is coming out the exhaust if any?
 
Deutz engines seem to use the 1011 designation on that range of engines i. e BF3M 1011 BF4M 1011.they do have a thermostat,it is under the plug arrowed in the drawing,12 is the thermostat valve,that's a four cylinder in a compressor but I think they are all the same.
AJ
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Its not black stacking at all. When started after sitting overnight it runs like a champ. Block gets warm real fast, but the oil cooling hoses do not. Cracked the top hose on front of the engine and cranked it over, had plenty of oil pressure there. Just have a feeling that thermostat is hanging up.
 
Remove the hoses from the oil cooler and check it for flow. Have seen them plug up a few times. You can always take the thermostat rate out, run the machine and see if the condition changes. If it's not smoking any smoke at all when it looses power and dies kind indicates a fuel issue.
 
I think also that there is a fuel issue and there may be nothing wrong with the oil cooling,all the fore runners of that engine had a gauze so fine in the lift pump the slightest bit of curd would block it,if the top comes off the lift pump clean the gauze,make sure the filter is clean also,the idea of the thermostat is for the oil to warm up quickly then it opens and lets the oil through the cooler,what are the gauges reading,service the fuel system and go from there as you may find that when the engine gets warm enough the cooler will get hot as that is the way it is designed.
AJ
 
Fellas, We have removed the priming ball and installed an electric fuel pump. We have fed the pump both from the tank, and to make sure of the pickup tube, we also fed it from 5 gal. fuel can. It has good fuel pressure everywhere. This is a real mystery.
 
Did you remove the screen In the end of the lift pump aj was talking about to see if it was restricted? Also try hooking a remote fuel source directly to the injection pump inlet. Bypassing the filter head and lift pump( I usually use a Coffey can with a 5/16 steel line Brazed in the bottom of it and fuel line the rest of the way) let the fuel gravity feed to the pumps. If it stays running then that eliminates engine issue. Also could possibly have weak fuel shut off solinoid. There were two different styles. Check the resistance of that to verify.
 
We have done both of your suggestions. As far as fuel delivery to the pumps, I do not think it is an issue.
 
OK you seem confident it is not a fuel to the pump issue,next time it stops have a wrench handy and loosen an injector pipe and crank the engine over and see if it spurts out fuel,if not the fuel shut off solenoid may have an issue,but it may only be doing what it is told to do by some sensor,I am not familiar with the Bobcat setup but have worked on those engines in compressors,generators etc,there was a few safety shut down devices fitted,has the Bobcat got anything like that,usually its to do with the oil pressure or temperature,has it got gauges or warning buzzer,could the stop/run solenoid be getting hot and letting the plunger release,if it is spurting out fuel see if there are air bubbles in it,if so an injector nozzle could be sticking open letting the compression get into the injector pump causing an air lock,but that is a long shot.
AJ
 

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