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Curtis B.
Curtis B., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 26523
Experience:  Technician turned service manager on multiple lines of trucks and engines, used in industry.
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What causes the exhaust tempature and to get to hot

Customer Question

What causes the exhaust tempature and to get to hot
Submitted: 11 months ago.
Category: Medium and Heavy Trucks
Customer: replied 11 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 11 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 11 months ago.

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

Expert:  Curtis B. replied 11 months ago.

What problem are you seeing?

Customer: replied 11 months ago.
The radiators are dirty but wouldn't that cause the engine temp to rise
Expert:  Curtis B. replied 11 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 11 months ago.

Exhaust manifold can be red hot!

Customer: replied 11 months ago.
Temps are between
1 engine 1269 1279
Engine 2 1198 1224
Engine 3 1269 1137
Expert:  Curtis B. replied 11 months ago.

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

Customer: replied 11 months ago.
The engine get hot and DE accelerates
Expert:  Curtis B. replied 11 months ago.

All do this, are one?

Expert:  Curtis B. replied 11 months ago.

Any coolant loss? Have the radiators been cleaned?

Expert:  Curtis B. replied 11 months ago.

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

Customer: replied 11 months ago.
Two of them do
Not that I know of the air filters have been changed
Expert:  Curtis B. replied 11 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 11 months ago.
They are not awake yet
Expert:  Curtis B. replied 11 months ago.

!! I wonder why I am!

Expert:  Curtis B. replied 11 months ago.

Lost internet! Please accept to close.

Expert:  Curtis B. replied 11 months ago.

What was the outcome on the units?