Cummins ISX High Oil Temp!

If it is possible, I may just remove the oil thermostat at least for summer. Hot oil =thin oil and less parasitic draw on power and improved fuel mileage and emissions performance. I am no engineer and I get that. But at what cost does this higher efficiency come at?

 

Curious as to which Komatsu parts were used?

 

I would like to know that as well. I have a lathe if I need to make spacers or something.

 

Ok. To correct my prior misinformation. The factory stat for an isx is typically a 4952629 and 235*. A 4952631 is a 215* stat that is listed as oe for some N14's. It is claimed by some to be a direct replacement. The picture I was shown looks identical to the oe 235* stat except it has a different part number and 215* stamped on it. Also, the idea of running without one is a bad one. Thermostat is what directs oil to cooler. To me, the whole concept is silly. I understand that the oil temperature needs to get up to 215* or so to help rid of condensation moisture. I know that the engineers are wanting the oil thin to reduce parasitic draw, ss was previously mentioned, but that does come at a cost. If you are on a long constant pull oil temp might eventually Crest 250* But, by raising the oil temp and everything it is in contact with to 235* it is taking a big bite out of the available heat absorbing mass of the engine and oil. Kinda like those water cooled transmission coolers bringing the oil temp up to the coolant temp. Doesn't leave as much "cushion" for the oil and mass of the transmission to absorb the heat created by work before you are starting to exceed the working limits of the oil. I may try the 215 stat and see if it is compatible. Under unregulated conditions oil temp is usually 10 to 25 degrees above coolant temps in my experience. Seems to me that having such a high temp stat could mask a problem that might otherwise be noticed by watching oil temp vs water temp.

 

Just wondering if problem was ever resolved. I tried the 215 thermostat and still overheating oil.

 

Me too. Mine will run right up to 250 when loaded. Never really goes past. I am starting to question my water pump, oil cooler and maybe radiator. Thing is, my radiator temp never gets out of hand. Never goes over 210 either with fan on manual or automatic. Oil does run a bit cooler with 215 oil stat when empty, but about the same as before when loaded. Hard to get pyro over 850 or boost over 35psi and has done it since we have owned it which is long before it was modded. have just never seen an oil cooler fail like that. They always leaked instead of getting plugged up. But always been a Cat or JD. This is 1st ISX...

 

Mine was in-framed 25k miles ago and egr and dpf delete done about a month before that. Everything was fine until truck enterprises called themselves updating my computer. After they messed programming up took it straight to shop to same guy that programed it the first time. First day everything was good. Everyday since it gets 260 plus if I don’t let out of it on long pull and even will do it empty on same long pull (5 miles up) 70 mph empty and low 40s loaded. I have changed oil, filter, oil thermostat, oil sensor. Also tried the 215 degree thermostat and had same results as w9l.

 

Has anybody come up with a solution I just bought a truck with a cm870 in it and during hard pulls on 80 in Pennsylvania load it I'm sitting right at 250 oil temperature the entire length from the Ohio line to the i80-81 split....

I'm wondering if they're also might be another problem I have lack of power and quite a bit smoke under load .... Turbo actuator? EGR stock open? ......... I figured if the EGR is stuck open that might be the reason for the higher temperatures .

 

Had two customers come in for high oil temps and did the 215*f oil cooler T-stats and made no or little difference so pulled the oil cooler out ( isx 2350) and replaced the element, problem was solved. What I did find is a coating of sediment on the elements of both engines, so it might be possible to do a good coolant system flush with a good cleaner and achieve better results before going to the expense of replacing the elements. Be sure to replace the coolant filter at regular intervals as well.

 

Finally solved my oil temp problems by replacing oil cooler element. It was full of sludge and stopped up. I put this off until last because everything I had read said replacing oil cooler did no good but it was definitely my problem.