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D6c cat loss of oil pressure

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Steve.ahlgren85

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Jun 4, 2016
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Darwin, mn.
Had to replace a couple hydraulic lines was that developed leaks with the removal of the torque converter, got that done, did some pushing dirt yesterday, everything was working great .engine running great, started to lose power slowly ,noticed fuel leak on one of the injector lines coming from fuel pump,tightened that up, but still have the same problem. It wants to run when cold, power down when warms up. I have to do some troubleshooting, maybe timing is off a little. Thanks for checking in!
 
DMiller

DMiller

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Hermann, Missouri
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Cheap "old" Geezer
May also need check for restrictions in fuel lines from tank or in tank as to power loss. Timing should not change effect between cold/hot engine. Is it actually dropping RPM or just slowing down as to pushing at same rpm?
 
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Steve.ahlgren85

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Darwin, mn.
You can hear the engine losing rpms,like it is not getting enough fuel. IT shut off on me yesterday, but started back up again. I will check for fuel restrictions, but don't think that is a problem .Could dirty injectors be causing this?,Thanks for the suggestions DMiller!
 
DMiller

DMiller

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Dirty nozzles would show up right off of start. These are not like gas engines, the injection pump either sends fuel or doesn't, positive displacement and unless the flow is restricted to feed the pump the engine should run at speed.
 
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Steve.ahlgren85

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Darwin, mn.
Could find no restrictions of fuel from line to the tank As I was watching for leaks at the head, I noticed air, fuel leak at #4 cylinder, pulled injector out and found that nozzle was not tight on the base. I tightened that up,no more leak there. Was not firing on all cylinders, located #6 cylinder as the one not firing smoothly, pulled injector out and, cleaned it up, blew air backwards through the nozzle, put it back in but still is misfiring on just that one cylinder. I am going to try a new injector, see if that helps. Any thoughts on why yesterday the engine shut off on me??I Had it running today for a short while, about 10 minutes.Thanks
 
O

oarwhat

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Dec 14, 2009
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buffalo,n.y.
I'm going to bet your filters are getting clogged with algae . How old is the fuel? Was the tank ever cleaned out?
 
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Steve.ahlgren85

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Jun 4, 2016
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Darwin, mn.
No, tank was not cleaned out. I just added 25 gallons, topped it off. That could be the problem, just didn't think of it..I got the machine last summer, who knows how long that fuel had been sitting in the tank. Tank was full when I brought it home!!
 
kshansen

kshansen

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Rusted said:
What was the fuel pressure gauge reading ?
Click to expand...

Very good question, one that someone who had an idea of what they were doing would check as soon as the engine seemed to loose some power.

If there is a suspected problem with the nozzle/injector on #6 just swap it with say #1 and see if the "problem" follows the nozzle/injector.

Not knowing the condition or age of what is in the tank is not a good sign.
 
S

Steve.ahlgren85

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Darwin, mn.
Fuel pressure gauge was reading full fuel pressure!I will try swapping the injector nozzles,that is a great idea. Should you replace all the nozzles, or can you just replace the one misfiring?
 
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Steve.ahlgren85

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Darwin, mn.
I am thinking that I will drain the tank, clean it out, start with new clean fuel, new fuel filter. I have never heard of slime in fuel tank, but then again, what do I know!!
 
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Jackie j

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Oct 27, 2015
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Us
You shouldn't be able to blow air thru the nozzle.......like kshansen said swap nozzle to another cylinder and see if problem misfire follows. Algae does grow in diesel somehow, many of our machines have had algae issues. I have also had fuel caps not venting cause similar problems. Would run perfect for a while until the tank got enough vacuum that lift pump couldn't pull fuel anymore, then engine would stall until vacuum lifted and system was primed again....
 
Hobbytime

Hobbytime

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usa
did you invest in a set of manuals for the machine yet? most of the trouble shooting , adjustments and info you ask would be at your fingertips..I have whatever manuals I can buy for each machine and piece of equipment I have...the $$ spent on manuals will save you 10x that amount if they keep you from making a costly mistake than just keep going on what you think is the right way togo.. then after you read the manual, you can ask better and more defined questions here..this is from another tinkerer of machines and equipment..
 
kshansen

kshansen

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S

Steve.ahlgren85

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Location
Darwin, mn.
Interesting article!I cleaned out the vent on the fuel cap, It was pretty dirty. I am replacing the track adjuster, will not keep track tight!
 
Hobbytime

Hobbytime

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with the introduction of biodiesel has brought this problem up much more, also the reduction of sulfur in regular diesel....
Did You Know?
Ultra Low Sulfur Diesel (ULSD) fuel has more problems with microbial contamination than previous higher sulfur fuels. Since ULSD can no longer carry water dissolved in solution, more water is shedding to the bottom of fuel tanks, creating a life-support system and breeding ground for microbes. Parrafin content has increased as sulfur and aromatics decrease, providing a major food source to microbes. Additionally, sulfur is a natural poison to bacteria and fungus and its reduction has further exacerbated microbial contamination problems in ULSD.
 
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