Cm870

[Rawze]

(09-21-2023 )Benjamin9669 Wrote:  Before you go assuming. No. I am just going off what the dumbass said. He said “there is no tsat” on these 870’s. “It depends on the climate”. I am literally just going off what the dumb ass said. I know they have a tstat. I tried telling him there is one. Many times.

You need to ensure that whoever did the oil coolers made sure the thermostat was installed... and that it was functioning properly.

NOTE: Some ISX models only have a single oil cooler element in them, some have dual elements. Depends on application, but ALL ISX's have an oil thermostat, and a minimum of at least ONE oil cooler element.

You stated you "had the oil cooler done".. and that some complete idiot told you that there was no thermostat?. This would make me really question their ability to work on these engines.. as EVERY SINGLE CM870 ISX HAS a DAMN OIL THERMOSTAT!!!.. AND IF THEY SAID THAT NOT ALL OF THEM DO, >>> then for all you know at this point.. it could now be missing!.

The oil does not overheat as badly as you describe unless something is very wrong. A missing oil thermostat after the oil coolers were re-done, could very well be the case.

People do dumb things!... They do stupid s$it like removing the oil thermostat, so if you are not the sole original owner of the truck since brand new .. someone somewhere .. or that idiot who did the oil coolers.. could have very well removed it like a dumb s$it .. and this certainly would cause the oil overheating issues that you are asking about.

It could also simply be that the oil thermostat that is stuck open, and failing too.

SO..,. the next step, after verifying that it is actually overheating (oil temp sensor is not reading higher than it should), it looks to me, like it is to replace the oil thermostat and go from there... and believe me, replacing that oil thermostat is not such an easy task.