cat c15 motor - coolant circulation p...

cat c15 motor - coolant circulation problem

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polly

Hillsborough, NJ

#1 May 17, 2011
We noticed after flushing the radiator that the bottom radiator pipe is not consistantly hot. Occasionally is cool towards radiator, hot towards engine. performance unaffected. the engine water temp and oil temp are normal temperatures.
any suggestions as to cause?
KHAWER

Islamabad, Pakistan

#2 May 18, 2011
AIR MAY BE TRAPPED IN COOLING SYSTEM
REMOVE RADIATOR CAP AND RUN ENGINE AT FULL LOAD AND IF WATER LEVEL DECREASES FILL THE COOLANT
AND MAINTAIN WATER LEVEL AND INSTALL RADIATOR CAP
polly

Hillsborough, NJ

#3 May 18, 2011
thanks for replying. my husband did try loosening the radiator cap and driving it that way for about 50 miles and the level did not decrease.
any other ideas? bottom of radiator temperature still fluctuating from cold to hot.
KHAWER

Islamabad, Pakistan

#4 May 19, 2011
LET ME KNOW FOLLOWING PARAMETERS REGARDING C15 ENGINE YOU MAY CAN USE INFRA RED TEMPERATURE GUN.
1 RADIATOR UPPER TANK TEMPERATURE.
2 RADIATOR BOTTOM TANK TEMPERATURE.
3 COOLANT TEMPERATURE AT GAUGE.
4 AMBIENT TEMPERATURE.
5 WATER PUMP INLET TEMPERATURE.
6 WATER PUMP OUT LET TEMPERATURE TO BYPASSLINE
7 WATER PUMP OUT LET TEMPERATURE TO OIL COOLER.
8 FROM OIL COOLER TO CYLINDER BLOAK WATER TEMPERATURE.
9 FROM CYLINDER HEAD OUT TO WATER TEMPERATURE REGULATOR HOUSING TEMPERATURE.
NOTE PLEASE TAKE ALL TEMPERATURES AFTER SOME MILLAGE COVERED AND AT ENGINE FULL RPM.
Kyanez

Frisco, TX

#5 Mar 11, 2012
I have a 2008 Peterbilt w/cat engine. There is coolent coming out of the driver side air to air hose and the top turbo looks wet with coolent also. Any help?
Ken

Marion, IN

#6 Mar 12, 2012
Kyanez wrote:
I have a 2008 Peterbilt w/cat engine. There is coolent coming out of the driver side air to air hose and the top turbo looks wet with coolent also. Any help?
It sounds like the "preheater" is leaking internally. That's the only way coolant can get into the air-to-air system!

On the passenger side of the engine, behind the alternator is a cast-iron box (about 8 inches wide, 12 inches tall) that is connected by a metal flex hose to the 2nd turbo. On the front is where the air-to-air hose connects. Inside this box is a miniature "radiator", and coolant flows through this to "heat" the intake air before it reaches the engine.

If replacing it yourself, be warned that it is harder than it looks...and DON'T damage the metal flex-pipe between this box & the turbo! That little itty-bitty pipe costs $315 to replace :(
oscar

Atlanta, GA

#7 Jun 12, 2012
C-15 cat water keeps comming out if relief line under radiator cap will not keep water in radator after it runs for a few minutes ......high pressure in radiator
J gonzalez

Royersford, PA

#9 Jun 18, 2012
I just had the same problem with the coolant coming out of the radiator cap n tried what u did and took it to cat and it's most likely your head gasket that was mt problem
David

Red Deer, Canada

#10 Dec 13, 2012
Over hauled c15 550hp in 2004 Pete. Drive it down the road and water temp will get hot over 200 and then can air turns cold engine won't cool down till truck is stopped. This is with no trailer on and - 10c outside. Any ideas? Put new rad in and new thermostat. Water pump?
Dwight

United States

#11 Jul 16, 2013
Got a c15 single turbo engine. Replaced thermostat, flushed radiator, replaced CAC and it still runs hot while bob tailing. No leaks or overflow. Any suggestions.
Dwight

United States

#12 Jul 16, 2013
This is on an 01kw 475.
Lonnie

Fort Worth, TX

#13 Jul 19, 2013
Tubo gets hot fast It's not blowen smoke the pyro temp rises fast some coolant jelling from thermostat to the. Little tube goin to the turbo any idea
driver

Vienna, WV

#14 Sep 3, 2013
C15 2004 Pete rad fushed n cleaned new thermostats good water pump did bottle test no bubbles but will overheat on long pulls loaded on short step climbs it will not. And the trucks load. Have any ideas cuz we r out

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#15 Sep 4, 2013
driver wrote:
C15 2004 Pete rad fushed n cleaned new thermostats good water pump did bottle test no bubbles but will overheat on long pulls loaded on short step climbs it will not. And the trucks load. Have any ideas cuz we r out
Have you cleaned the fins of the radiator, the condenser & the charge-air cooler? Also check to see that the wires going to the "coolant diverter valve" are not melted together & shorting out. The original wiring harness runs too close to the turbos, and gets damaged by the heat. This valve is located on the passenger side, middle of the engine below the turbos. It will have a 1" heater hose connected to it, and two wires.

When this valve works properly, it reduces your engine temp by 10 degrees. I have had to replace these wires on all of our W900's.
Fred

Detroit, MI

#16 Sep 23, 2013
We just had a platinum overhaul (700,000) and the engine was running hot prior to going in. Not overheating (yet) just emitting a lot of heat and running much hotter than is used to. Overhaul did not fix the problem. Left there and had the radiator pulled and rodded out.. still the same problem. Any suggestions?
Ken

Marion, IN

#17 Sep 24, 2013
Fred wrote:
We just had a platinum overhaul (700,000) and the engine was running hot prior to going in. Not overheating (yet) just emitting a lot of heat and running much hotter than is used to. Overhaul did not fix the problem. Left there and had the radiator pulled and rodded out.. still the same problem. Any suggestions?
If you have a twin-turbo Acert, then read my post above about the coolant diverter valve.
Sid

Noida, India

#18 Sep 25, 2013
Hi
Shaq

Dundas, Canada

#20 Jan 21, 2014
I have CAT C15 engine had it overhauled and drove 375,000 miles.
Do i need to get the tune up of engine.

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#21 Feb 9, 2014
Shaq wrote:
I have CAT C15 engine had it overhauled and drove 375,000 miles.
Do i need to get the tune up of engine.
It wouldn't hurt to have the valves adjusted, and the rocker arm bolts inspected for proper torque. Caterpillar recommends this to be done at 250,000 mile intervals. I personally adjust & inspect all of our C-15's every 150,000 miles, about once a year.
Breether

Hilliard, OH

#22 Apr 4, 2014
I am almost there, but now I am stuck. I unbolted the front housing to the water pump and removed it. I have unbolted the oil filter housing from the oil cooler and now here I am looking at this and can't figure out which bolts to undo to release the oil cooler. My sister is typing this so and will watch for your answers. Thanks for all your help!!

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