what would happen if the thermostats were removed. i have a detroit engine & during the summer months the water temp gets too high too quick. & takes the fan longer to get temp back to normal. replaced thermostats. water pump o.k. new radiator, new hosese. e.t.c. when going up hill loaded, temp climbs really fast. not losing water. i remember removing my thermo's in my old 1970's cars & they ran a lot cooler during the summer & i would just put them back in before the winter. i dont know how a diesel engine would run without thermostats. i just know last year i had to run my fan a lot. & trying to figure something out that may help me before the hot days get here. the truck came with 190 thermo's i put in 180 thermo's wich helped a lot but it stays min 190 to 215. running 40,000lbs up slight hill i have to run fan. was thinking either remove thermo's or putting in 170 or 160 degree thermo's..?????? thanks

 

There's a small hose, maybe 3/8" dia. that comes off the thermostat housing and goes to the radiator tank. Pull it off the radiator, and run the rpm's up. Coolant should shoot out of it, I mean shoot out. If not, take the hose fitting out of the thermostat housing and dig the mud out of it.

 

I would fix the problem instead of putting a bandaid over it. Pulling the t-stat may not even help.

 

That's what I was getting at, Allan.

Even though my Detroit was consistantly blowing head gaskets, even with a blown head gasket, IT NEVER HEATED. Something is wrong somewhere and the bypass hose is the only thing I can think of.

 

i agree. i have spent money on process of elimination, because no one could tell me exactly what is causing temp to rise. so to fix.. i have to know what is wrong & even williams detroit cannot reach a conclusion. all say basically the same thing as when i 1st encountered this issue.. goes like this... sounds like thermostat. put in. still run too warm..next.. sounds like radiator. put one it.. still runs too warm.. next water pump.. put one on.. next... ya know that is about the right temp. i know my truck & what temp it has run for 8 years uphill down hill loaded/unloaded. & i know when it runs at a consistant higher temp than ever before. the last diognosis i heard was sys may need to be cleaned with cascade run thru sys to remove buildup that is too thin to see with the naked eye. lol. believe me i dont mind spending any amount of money to fix any problem. but i hate throwing good money after bad. i will look at hose coming off thermo housing as suggested.i do remember taking off & replacing all my hoses. will have another look. thanks for the help. if hose is clear.. i guess i'll have to try different temp thermos or remove them this summer. i am at a loss at to what to try next. add up the cost of all i've done plus the downtime & still have the problem?? sooo unless someone can give me advice that i have not already tried. i have no choice but to remedy this myself as foolish as it may sound.

 

Do you have a pyrometer?

Ask a competent shop to connect to the ecm and check the injector calibration codes. If they are all set the same, you've found your problem.

If not, i might recommend pulling the fuel return restricted fitting to see if it's been tampered with.

Bob

 

What do calibration codes do exactly?

 

Yeah, Bob, could you elaborate some...This CAT I'm driving right now (I made a post about it under bad kitty cat) doesn't get hot, but you mentioned Pyro - this one will go to 1400 at around 1300rpm and is getting horrible fuel mileage. It has a recent turbo, new CAC and new hoses on it...

 

i have no pyro meter. however i am schedualing a day to have injectors put in since they have over 1.1 mil miles on them. with the exception of one that i had put in a year or so ago. also as others here... the injection calibration codes means what & how does the codes affect the temp ?? thank you.

 

...an electronic fine tuning of the EUIs