Cat 3406B getting hot!!

sounds like the whole thing needs to get cooked out and back flushed. Engine block AND radiator. Sounds like a neglected system over the years.

 

My old b same way putting new 5 row radiator to solve the problem just a 1200 .00 problem

 

how hot is it getting? if you go with a new radiator just get a 4 row with the cooling fins at 14 per square inch, it will cool better than a 5 row will. change the thermostats maybe it is sticking. another thing people over look is the cac. if it has a leak it will make the engine work harder.

 

200! thats not hot for a cat. 215 and up then you should get worried. sounds like someone has the screws turned up a little. 200 is perfect running temp for a cat especialy if the outside temp is 100 deg.

 

sounds normal for what you got. the only other thing to do is go with 180 stats and a 4 row rad. heck mine runs at 200 deg. on a 100 deg. day grossing over 100,000 lbs. but thats with a 4 row rad and 180 stats. i dont worry until it hits 215 and the fan wont cool it down. then its time to drop a gear and keep the rpm,s up.

 

190 is nothing for her , even 200 is fine for a cat once it goes over 200 the aux fan should kick on by itself , of course you can monitor it too in hot weather and turn it on yourself especially if your in traffic pulling close to gross or over on a hot day. What do you use for coolant? Is it a 50/50 mix ? You don't say how hot she gets ? Maybe trying to flush the system and go from there, also what thermostat is in it , maybe the previous owner put the wrong one back in , that can happen very easily . Hope you make out OK .