How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Curtis B. Your Own Question
Curtis B.
Curtis B., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 26059
Experience:  Technician turned service manager on multiple lines of trucks and engines, used in industry.
30244710
Type Your Medium and Heavy Trucks Question Here...
Curtis B. is online now
A new question is answered every 9 seconds

What causes the exhaust tempature and to get to hot

Customer Question

What causes the exhaust tempature and to get to hot
Submitted: 9 months ago.
Category: Medium and Heavy Trucks
Customer: replied 9 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Curtis B. replied 9 months ago.

Exhaust temperature rises as the load on the engine is increased. The extra fuel in the cylinders cause cylinder temperatures to rise, and the exhaust goes through the turbo charger, which raises it. All relate to higher water temperature . Cooling system , fan, thermostat, water pump, and radiator all work together to keep engine in a safe operating range. Radiator has to be clean, the fan belt tight, thermostat working properly , and water pump circulating the coolant.

Expert:  Curtis B. replied 9 months ago.

Over heat occurs when one of the functions has a problem.

Expert:  Curtis B. replied 9 months ago.

What problem are you seeing?

Customer: replied 9 months ago.
The radiators are dirty but wouldn't that cause the engine temp to rise
Expert:  Curtis B. replied 9 months ago.

What is rising? Just exhaust temperature? What temperature are you seeing? Turbo charged diesel under load can be 1200F

Expert:  Curtis B. replied 9 months ago.

Exhaust manifold can be red hot!

Customer: replied 9 months ago.
Temps are between
1 engine 1269 1279
Engine 2 1198 1224
Engine 3 1269 1137
Expert:  Curtis B. replied 9 months ago.

?? All appear to be in a normal range. What is concern? What is load factor? I assume these are generators.

Customer: replied 9 months ago.
The engine get hot and DE accelerates
Expert:  Curtis B. replied 9 months ago.

All do this, are one?

Expert:  Curtis B. replied 9 months ago.

Any coolant loss? Have the radiators been cleaned?

Expert:  Curtis B. replied 9 months ago.

Can exhaust be restricted? Any change in air flow around units?

Customer: replied 9 months ago.
Two of them do
Not that I know of the air filters have been changed
Expert:  Curtis B. replied 9 months ago.

All seem to be very close in operating temperatures. I would be checking the radiators and cleaning the external fins, and checking the fan operation, and the air flow around the units, as well as the exhaust system, to be sure it is not restricted by ice/snow, etc. May be time to call in the Cat Dealer.

Customer: replied 9 months ago.
They are not awake yet
Expert:  Curtis B. replied 9 months ago.

!! I wonder why I am!

Expert:  Curtis B. replied 9 months ago.

Lost internet! Please accept to close.

Expert:  Curtis B. replied 9 months ago.

What was the outcome on the units?

Related Medium and Heavy Trucks Questions