help!! hot running hj61

[Sausagegrinder]

I have a 89 HJ61 RHD 12ht and I have went through the whole cooling system from a new rad(re-cored) to fan cluch, thermostat(I tried 2 new ones 195 and 180, flushed system , timing checked, cooling system checked for exahust gases, valves adj. injectors checked, cooling system vac'd of all air, no coolant in the oil, no oil in the coolant ,cleaned the A.C condenser, all is perfect!! I still have a problem with heating, I am in Saskatchewan Canada it does get hot here in the summer but the temp of the engine will run at 210-220 deg f pulling itself down the highway on a 30 deg c day, I could make it over heat at will!! Exhuast temp is between 600-800 deg f at cruising and if I push it i will see 1200 deg F . , pulling a 2500lb boat is out of the question!! (It is sad my dodge mini van can tow more than my cruiser!!!!)The truck is an auto also, which I have added a tranny cooler to the sytem to help keep that safer.
CAN ANYONE TELL ME IF THE COOLING SYSTEM IS JUST ADAQUATE AND THAT IS THE PROBLEM OR IF ANYONE ELSE HAS HAD THIS KIND OF PROBLEM AND FIGURED IT OUT BECAUSE I CAN'T!!! THANKS

 

[roscoFJ73]

It does seem to be running warm. Is it overfuelling?,blowing black smoke? I see you had other work done on the fuel system ,but you didnt mention that.

Is the engine coolant temp gauge ok?
Its a difficult one as you seem to have done all the right things.
I had a HJ61 for short while and it stayed cool a cucumber in 30c

 

[Sausagegrinder]

Hi thanks for the resonse, I have installed a mechanical Auto meter gauge in and have used a infared thermo also, under normal driving it doesn't seem to push black but it does push out quite a bit under load. I thought over over fueling but the EGT doesn't seem to refect that? This is very frustrating!!

 

[Talos]

I have a HJ-61 too and I´m seeing temps up to 300C (580F) in while cruising at 90km/h.. that´s post turbo mind you, but with a trailer (2000Kg 4400lbs) it goes up some 50C to 350C (670F) and I can (and have) thrash it to 600C (1100F) up a very steep and long hill but I held 90km/h all the way up (only did this once)
I thought my temps were normal

the engine is stock, but does smoke a bit when taking off...

what would be "normal" egts for a HJ-61 cruising at 90-100 km/h (60 mph)??

 

[Jan-78FJ40]

I have a HJ-61 too and I´m seeing temps up to 300C (580F) in while cruising at 90km/h.. that´s post turbo mind you, but with a trailer (2000Kg 4400lbs) it goes up some 50C to 350C (670F) and I can (and have) thrash it to 600C (1100F) up a very steep and long hill but I held 90km/h all the way up (only did this once)
I thought my temps were normal

the engine is stock, but does smoke a bit when taking off...

what would be "normal" egts for a HJ-61 cruising at 90-100 km/h (60 mph)??

I think you are talking about two different things. The first post talks about water temp first (up to 220F) and EGT second (up to 1200F).

your truck seems to run significantly cooler.

Sausage, what boost are you running? A combination of overfuel and underboost will give you high temps. Is the turbo ok?
Anything dragging?
I have a turboed 2H, and I have to lay off the throttle on highways on hot days, otherwise she hits 220 easily. but a hot day here means 45C, not 30.
cheers,
jan

 

[Sausagegrinder]

Thanks Again!! The boost is running at 8 psi I have looked at the turbo and and it has no slop and spins great, I have turned the boost up to 15 PSI then the over boost light comes on the factory gauge, and it doesn't seem to make much difference I thought it might help with over fueling if that is the problem. How much boost are you running on your 12h? And Talos on your 12ht? Do we have any idea what is stock and what is safe?, I also have my EGT post turbo. I looked back and the days I really had the problems we hotted than 30 they we high 30's with the humadex into the 40's and I was seeing the same kind of temp your 12h will.

 

[Fantom]

A friend on mine has the same model truck with an auto as well. We were having a fun time trying to figure out what the issue was and he too went through everything, rad cap (it will make a difference!), thermostat, water pump, fan clutch. In the end he had the rad recored (along with the tranny cooler in the bottom) and flushed the tranny and cleaned the filter. So far it is working. His problem was that the engine would run a bit hot, then the tranny would heat up and then the engine would run hotter and so on. When's the last time you checked/changed your transmission fluid as well. When you were doing all the fun stuff to the coolant did you notice anything in the actual fluid and chambers, any extra build up, anything floating. If may be possible there is something blocking the system. I know there are various opinions about doing system flushes, in older vehicles they can do more damage then good in the long run.

 

[daboheme]

Auto or manual gearbox?

Was the injection pump timing checked when you had the injectors done? Check it just to make sure.

My HJ61 only gets hot (and that's about two-thirds up on temp gauge) when tackling passes and having to drop down to third (and subsequently no lock-up of torque converter). I suspect my TC is f'ed anyway.

 

[Garry]

I had my radiator upgraded to 4 row core. No overheating that baby Although I don't run a turbo either. (my ten cents worth) How is the viscus clutch on the fan?

 

[Sausagegrinder]

I have change the rad cap went higher pressure went with the same pressure didn't make any noticable diffrence, the pump timing has been checked and it is bang on, I have not done anything with the tranny , I will give that a try I am in deep enough now why stop!! It is an Auto box, new fan cluch. Thanks again for giving me someone to bounce problems off of.

 

[Tapage]

One think it's overheating and other it's run a light hoter .. starting from 180F to 200F I thought it's normal ..

If I run my turboed 2H close to 3k rpm more than 30 min .. it come hotter .. if calm down to 2200 rpm it come to the normal temp .. 185 - 190ºF on the city driving no matter what it keep at 180ºF

I'm boosting 14 PSI and get max 1100 EGT ( adjust my fuel to that )