My last bus was a 8V71 with a four speed standard trans on a 35' frame, now I have a 1980 Eagle 6V92 turbo with 740 Allison auto. First 1,000 trip in the convertion. It seems to me the 8V71 had more power, is this the norm ? I have changed fuel filters, looked at air cleaner looked clean, don't know if I should expect more or not? On our first trip we over heated on a mt pass, 90 out side, is this also normal?. What is the temp that the auto shut down applies? My temp gage must be wrong or bad it shut down at 158. Not good with wife flagging traffic on a mt pass with air brake's locked on! Got it running but need advice so we don't have this happen again. Help RMC
How long have you been driving this bus with an indicated temperature below 158?
We have an 1981 eagle with the same motor, and tranny, we don't have any overheating problems and plenty of power, many things could be causing the problems, clogged injectors, plugged aircleaner, did you change both fuel filters? If you overheated at 158 degrees I would think your temp guage is not reading correctly, the overheating problem is probably the radiator being low on coolant or plugged, the belt tensioner may need to be looked at too. Could also be old or bad fuel, many possible problems. The 40 ft eagle probably weighs conciderably more than the 35 fter you had so that will create a different power situation too, many variables, mine has no shortage of power so I know that the motor should be capable of moving the coach along nicely.
your shut down should be around 210 and your 8v71 might have more power if it was set at over 300hp and your 6v92 might be set at 250 hp have some one check your setting on the 6v92
How do I reset the automatic heat shut down on a 6V92 eagle 10? I have changed the dash completely and not sure how to rest it? On the motor I see the thermostat sending unit and to the left and down a little I see another temperature sending unit with three wires connected to it ,is this my emergency shut down control? And if so which wires do I need to jump out, or or how do I reset.
I have two aux 20 gal fuel tanks that I relocated from original set up and I think I disturbed a lot of sediment in them. I'm going to try a nother new filter to see if that helps power. Thanks RMC
We drove the bus for about a thousand miles but it never got above 158 even on hills, so every thing seemed OK. It then got so hot on a long grade it shut down. The only way I got it going was to put a hot wire on starter solenoid Then pull over till it cooled down now it won't start any other way.
Maybe start with the temp. Buy a infared hand held temp gun and check the temps at the water rail. If the gage is right then that would go with small injector/ low power. Sounds like a problem with the key switch start terminal or a broken wire. Are the wires loose on the starter? I am assuming you have a non DDEC unit. Your automatic shutdown is not something I know anything about. It must be manual and should reset its self when the temp drops. If its DDEC and it shuts down going up hill, put some oil in it even if it looks like its ok. Check the wiring diagram for that circuit and test the breaker in the drivers service panel for continuity.
Install a new mechanical temp guage in the engine compartment. Now you will have something to compare the dash guage reading to - all the time.
Dash guage seems like it might be defective.
Check coolant level,check for coolant leaks,operation of radiator cooling fan, clean fins of radiator,check coolant flow. 8)
There are thousands of threads on overheating and proper operating temperature on the BBS but there is unanimous agreement that the correct operating temperature for a diesel engine is between 180*F and 190*F.
Make sure that your temperature indicators are reading correctly and make sure that your engine is operating in the correct temperature range. You can check the gauges by putting the sender into a pot of water on a hotplate. If you don't have an accurate thermometer to measure the water temperature, just heat it it until it is boiling and make the temperature correction for you altitude. It will fall between 200*F and 212*F.
If your gauges are correct and you are running the engine that cold, come back for suggestions on how to get the temperature up.
It sounds like the thermostat isn't installed or isn't working correctly.
Also these DD's need to be 'Burped' completely. If there is air in the system the senders will never heat up since they are made to be in liquid.
You may also want to check the thermostat. It's possible that someone changed it out for a 160° stat instead of the required 180°-190°. 160° never lets the engine warm up enough to give full power or burn the fuel completely. 160° stats are built for off road equipment and stationary engines.
As others have said, install a mechanical gauge on the engine and run it either to the dash or hanging in the engine compartment.
Good luck,
Dallas
GO BUSSING!
if you don't have a gauge for both sides of the 6v92 i would put one on if one side gets hot it takes time for the single gauge to read with 2 gauges you can monitor both sides