Generator starts, runs, and produces power fine. Only has 170 hrs on it. After about 4 hours of use it will shut down showing the low oil pressure fault. Oil pressure gauge shows pressures ranging from 47-52 psi when the generator is warm. Any suggestions on what this issue might be. Is the sender going bad?
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MEP-805B low oil pressure issue
- Thread starter ryanb72
- Start date
- 17,202
- 25,448
- 113
- Location
- Burgkunstadt, Germany
That could be. It would be nice if you were there to see, when it shuts off, what the pressure really is. The Gauge is to be taken with a grain of salt. Have you put a manual oil pressure gauge on it?
- 1,148
- 1,320
- 113
- Location
- Basehor, KS
Yes, otherwise Genset won’t even start
Also check oil pressure transducer opening for dirt accumulation since you gotta take it out anyway
Do you guys have a part number or picture of the “T” I need.
- 17,202
- 25,448
- 113
- Location
- Burgkunstadt, Germany
Hold on a second. There should be a place on the right hand side where the AOAP, (Army Oil Analyses Program) Has a valve to take oil samples. Take a look. Some gen sets have it and some do not. It its on there, simply rigg the meter to it. In any case, there should be a port, with a plug in it that you can use.
- 17,202
- 25,448
- 113
- Location
- Burgkunstadt, Germany
Look to the left of the two red MPU connectors. See a data plate hanging by a wire tie? Thats a AOAP valve. No, this is not a MEP-805. But most of the sets should have something like it. I am too dumb to figure out how to mark the picture, so you just got to go with the flow.
- 17,202
- 25,448
- 113
- Location
- Burgkunstadt, Germany
And this is a MEP-805A. See the valve below and to the left of the IP? Sadly, I have no pictures of an MEP-805B.
- 1,148
- 1,320
- 113
- Location
- Basehor, KS
@Guyfang in the end he probably is going to wind up taken the opt out to check for dirt accumulation on/in the small pinhole of transducer.
We found this to be the most common source of malfunction of the opt.
We found this to be the most common source of malfunction of the opt.
- 1,148
- 1,320
- 113
- Location
- Basehor, KS
Oil Sludge tends to accumulate on / in the pinhole opening.
The diameter of the pinhole varies by transducer.
Brake Cleaner or Carb Cleaner is usually sufficient to clear out the pinhole and the internal cavity
Note: the transducer in this picture is just for demonstration. The transducer on your Genset may look different or has more electrical connections, but will have a pinhole in the threaded part
The diameter of the pinhole varies by transducer.
Brake Cleaner or Carb Cleaner is usually sufficient to clear out the pinhole and the internal cavity
Note: the transducer in this picture is just for demonstration. The transducer on your Genset may look different or has more electrical connections, but will have a pinhole in the threaded part
Thank you guys. I really appreciate it. Glad I found these forums. Going to give it a try this weekend. also working through some fuel sender issues but from reading other forums on here I think it is just corrosion causing the issues. Been limping this thing along dealing with a lot of power outages at our ranch lately.
LuckeyD
Member
- 27
- 91
- 13
- Location
- Vilseck, Germany
Good Day: Had to read this all several times. Lets mess it up a bit. A B model TQG using a JD engine shutting down after 4 Hours running time all by its self. It just ran 4 hours no problems. As a TQG shuts down from another issue, the low oil pressure indicator comes on as engine RPM slows as all circuits are active but the engine has an issue. Suck, squeeze, bang blow and we have an issue in the bang. After the sender is inspected, please ensure connections are together and tight. Had these issues on Tikrit. It was a fuel issue. Hard to find. One was a dry rotted fuel hose all cracked up and the other was a bent fuel pickup or a lose fuel connection. They would run a while until it started sucking air rather than fuel. Usually as things warmed up. May want to look into that. Had the fuel pick hose several times as rebuild used air hose for brake lines instead of fuel resistant hose. After a fashion it n longer started. Other things to look at: How much dirt is in the control box. The R 40 is touchy on the bottom of the box, and use a small screwdriver and check those wires on the terminal boards. Put a thumb on those ribbon cables. The ESD 5551 engine control is another possibility as dirt gets in there and it accumulates around the reset pushbutton. Check the modules if any are not tight on the mother board. Any slop and your asking for issues. This is one you have to be there as it shuts down as Guyfang stated above. Had a real hard one where a trace on the motherboard was cracked and after warm, no connection due to expansion. 30Kws were noted on most FOBs for running over 35,000 hours with normal servicing. We had some at 54,000 hours still running fine.