Combines Overheating problem on 81 N6

What are the symptoms of your overheatingIJ

I think what Tom is getting at there, is it really hot or is the temp. gauge just showing hotIJ I have had that problem where the sending unit or gauge or both are giving false info. A rule-of-thumb for testing your cooling is to lay your hand on the radiator cap. If you can't leave it there, the system is over heating. Either way, it needs fixin'.

I have seen several cases of engines overheating when a hose gets old and collapses. This will only show up when the engine is running high idle, as that is when the water pump has the most suction. Also the bypass hose on some systems will get plugged and fail or it's fittings. Have you owned the combine since new or did the previous owners not keep the filter(if it has one)changed. And the Antifreeze should have been_be changed every 2 or 3 yrs to keep corrosion out of the system which can block passages. A cracked head will also cause it to overheat but you have probably check that with the pressure test. Now, since you have 2 of the same machine, do both have the same motor 670HI or 670IIJ This can be easily seen by the injector pump, Roosamaster(670HI) or Ambac(670I). If they are the same, do they seem to have the same power, if there is a difference in power output then you have a fuel problem(pump or nozzles)or timing, this will also cause it to overheat. Good luck!

I know this sounds to simple,but experienced it again this harvest!!!!! my retired shop forman has an 82 l2 that is overheating.. we must do something before bean harvest because he powerwashed out the radiator twice and it still heats up to the red. sent my main mechanic with a radar thermomitor he checked engine not under load and temp was around 200 deg. when my mechanic got done powerwashing the radiator,he says a minumim of a half hour,the thermostat housing ran at 180deg. air isn't the answer and a quickie with a washer isn't either. the whole radiator must be cleaned until the water goes all the way through the core on 100% of it.this will help someone if you try it,it is our main fix of these problems. if your not asleep by now try it and good luck!!!

I agree completely. Wash it well back and forth until it is clean of dirt. It takes a long time and the water that needs to sit in there awhile will soak it up and then it will come out easily. Also check to see belts are not bottoming out in groove and tighten the tention spring if there is any left. Set freeze portection to -10F for maximum heat transfer. Check the cap or replace it. Make sure engine is able to breath even though air restriction light isn't on it could be having a hard time breathing. Check asperator to see nothing is pluged up. Most newer engines have an anti-air buildup bypass hose fastened between top of cylinder head and top of radiator. We drill and tap the 1" allen head pipe plug at the flywheel end of engine and run a 1_4" hose to a fitting we plumbed into the top of thermostat housing. Running that hose prevents air buildup which causing boiling which causes overheating. Don't forget to double check timing. Have radiator pulled and rodded out if all else fails.