Medium and Heavy Trucks

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I have a c16 CAT I just left the dealer from putting in an
I have a c16 CAT I just left the dealer from putting in an oil cooler, 45 mins into the ride oil temp and water temp are running higher than normal operating temp. Only running a load weighing 19k it … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
Truck running too cool. C15 6nz had thermostat replaced.
Truck running too cool. C15 6nz had thermostat replaced. After warmup, takes 20 miles to get temp to 190. Temp drops 15 degrees going thru a small town, then it will pick back up in few miles. At 800 … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
4,737 satisfied customers
I have a 2000 year 6NZ C15 @ 550/1850 with 800,000 on out of
I have a 2000 year 6NZ C15 @ 550/1850 with 800,000 on out of frame rebuild. I am doing a ground up restoration on my 2001 Western Star, owned & operated for 16 years. I wanted to upgrade to C18 specs.… read more
Bradey V
Bradey V
Certificate
389 Pete has C15 Cat in it running hot... When I'm stop the
389 Pete has C15 Cat in it running hot... When I'm stop the truck is at 180 as soon as run pulling a load it runs hot...… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
I have a 2003 379 c15 6nz. My oil tempos at 220 with a new
I have a 2003 379 c15 6nz. My oil tempos at 220 with a new teltek gauge and sensor. My water temp shows around 220-225 when working the motor is working hard. I thought it sounds high. Have new thermo… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
Man. I have a 2011 Pete with 2009 c-15 cat sdp. I adapted it
Hey cat man. I have a 2011 Pete with 2009 c-15 cat sdp. I adapted it back to similarity of a 6nz. Mxs head, single turbo, 6 nnz ecmc. I've been getting more than usual blowby from the engine. Also I h… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
2003 Pete 6nz CAT. 26 months/$21,000 spent trying to fix.
2003 Pete 6nz CAT. 26 months/$21,000 spent trying to fix. Erratic power drop / high coolant temps. After 10 hrs driving it starts to run somewhat better with coolant temps controlled to normal … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
4,737 satisfied customers
Cat man, 2002 international with C15 have to add some
Cat man, 2002 international with C15 have to add some coolant every so often , can not find external leaks. Engine oil is fine. Where else to check. Also, water drips off the blow by hose and it has m… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
Cat Man, I've got a 6NZ that one of my mechanics forgot to
Cat Man, I've got a 6NZ that one of my mechanics forgot to put the oil drain back rubber gasket in the spacer plate. Do i need a whole new head gasket kit that has the rubber water jacket seals and ev… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
Looking for the "CAT MAN" We have a driver here with a c15
Looking for the "CAT MAN" We have a driver here with a c15 accert. He singled out the turbos a while back and has had a bunch of work done to it. Its pushing out around 900H.P. This was all done a few… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
My insured has a 2003 Pete 379EXHD with a C-15 CAT, s
My insured has a 2003 Pete 379EXHD with a C-15 CAT, his contention is that the engine code is a highly sought after C-15 adding thousands of dollars to the value of the tractor. He provided an engine … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
I have a c15 accert engine in a 04 Pete the problem is when
I have a c15 accert engine in a 04 Pete the problem is when operating around town works great but when I go on the highway the temp rises to 217 which when the fan cuts in it won't pull the heat out t… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
I have a c15 acert and a 2001 c15 single turbo in a Pete can
I have a c15 acert and a 2001 c15 single turbo in a Pete can I swap them and what problems would I have… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
I have a 2009 peterbilt,it is wanting to build pressure in
I have a 2009 peterbilt,it is wanting to build pressure in the overflow tank.I changed the radiator cap,the hose between the radiator and reservoir is not plugged,I bypassed the precooler between the … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
Cat Man, I have a 03 6nz. 100,000 miles on it after
Hello Cat Man, I have a 03 6nz. 100,000 miles on it after a out of frame. I have an overheating problem you have already gave me suggestions on. . I've checked my oil cooler, cleaned my radiator and a… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
I have a c15 cat that wont get over 150 degrees. I replaced
I have a c15 cat that wont get over 150 degrees. I replaced both thermostats and seals, bled air from the system, and still have the same problem. It is a single turbo 6NZ motor. Any ideas?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
Hi cat man I have a 2004 freightliner wit a cat c15 engine Few
Hi cat man I have a 2004 freightliner wit a cat c15 engine Few weeks ago I had a problem the truck switched off the engine and had f8 code and didn't want to switch gears replaced the computer box and… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
hi I am shopping truck. it will either be a series 60 or cat
hi I am shopping truck. it will either be a series 60 or cat 6nz. can you explain the difference in efficiency please?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,218 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

4,737 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

10,218 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

4,023 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,740 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

cumminsdr

cumminsdr

Mechanic

1,700 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

1,571 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

Chris (aka-Moose)

Chris (aka-Moose)

Technician

353 satisfied customers

24 years of experience diagnosing & repairing

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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