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  1. #11
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    The low pulling power seems to be built right into this 14 liter 515 Detroit. I still have 18 months of warranty on it or I would have already just pulled the plug on this project. If I'm not willing to drill out the fuel port, go with bigger injectors and a bigger turbo, then everything I've heard so far would be a waste of time.
    I've had this thing in the shop three times so far for over-heating. It could just be because it's such a suck ### engine on hills that it will always have this problem or it could be needing something done with the radiator. They have replaced the turbo. Then recalibrated the turbo. They replaced the EGR. They replaced the water pump, and it's still over-heating. I checked the radiator for built up blockage in the vents. It doesn't look that bad. I just bought a $600.00 pressure washer and had a special wand made to get the angle for trying to get it around corners to blow out anything blocking airflow. If this doesn't work then I am stuck with no other option but to take it in and let them R & R the radiator, remove the tanks and rod the #### thing out. My only consolation is that maybe the deductions will help me out when Uncle Sam wants some money at the end of the year.


  2. #12
    Road Train Member losttrucker's Avatar
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    Quote Originally Posted by Woody13 View Post
    The low pulling power seems to be built right into this 14 liter 515 Detroit. I still have 18 months of warranty on it or I would have already just pulled the plug on this project. If I'm not willing to drill out the fuel port, go with bigger injectors and a bigger turbo, then everything I've heard so far would be a waste of time.
    I've had this thing in the shop three times so far for over-heating. It could just be because it's such a suck ### engine on hills that it will always have this problem or it could be needing something done with the radiator. They have replaced the turbo. Then recalibrated the turbo. They replaced the EGR. They replaced the water pump, and it's still over-heating. I checked the radiator for built up blockage in the vents. It doesn't look that bad. I just bought a $600.00 pressure washer and had a special wand made to get the angle for trying to get it around corners to blow out anything blocking airflow. If this doesn't work then I am stuck with no other option but to take it in and let them R & R the radiator, remove the tanks and rod the #### thing out. My only consolation is that maybe the deductions will help me out when Uncle Sam wants some money at the end of the year.

    Just a question.....but have you tried just dropping a gear when pulling a hill and have the rpm's up or above 1500??

    I have an '05 and I've noticed it heats up ALOT if I lug it from 1300 to 1450 rpm's pulling hills so I had to learn to just drop gears until I had to feather the pedal instead of just pedal on the floor while watching the temp gage about to overheat

  3. #13
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    Quote Originally Posted by losttrucker View Post
    Just a question.....but have you tried just dropping a gear when pulling a hill and have the rpm's up or above 1500??

    I have an '05 and I've noticed it heats up ALOT if I lug it from 1300 to 1450 rpm's pulling hills so I had to learn to just drop gears until I had to feather the pedal instead of just pedal on the floor while watching the temp gage about to overheat
    Yep, I sure have. When you only have 6 to 20,000 lb's in the box there shouldn't even be a struggle with a 515 to pull a hill. I've tried low RPM's as well as 21 hundred RPM and the results are the same.

  4. #14
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    If that engine is overheating with a partial load then you have a problem. A mechanic should be able to fix it. It has nothing to do with the engine if the rad is plugged or the bug screen does not have air flow threw it. There are a lot of reasons for over heating.

  5. #15
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    Quote Originally Posted by JohnP3 View Post
    If that engine is overheating with a partial load then you have a problem. A mechanic should be able to fix it. It has nothing to do with the engine if the rad is plugged or the bug screen does not have air flow threw it. There are a lot of reasons for over heating.
    Bug screen is clear. There is minor build up between the cooling fins. I just bought a pressure washer and soaked and blew it out and then went and bought another wand for the handle so I could get a better angle on it. I'll soak it again and try to clear it out better. I'm not holding my breath though as there really isn't much in there blocking air flow. It's a last ditch effort before I have the radiator taken out and cleaned. Not really looking forward to having to pay the bill on that one.

  6. #16
    Light Load Member Cat nip's Avatar
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    It's that low torque. I just went from an 1850 cat to a 1550 cat and what a nightmare. I'm saving up and heading over to see Mr. Haney!

  7. #17
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    has anybody checked the thermostats? or engine fan?

  8. #18
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    Quote Originally Posted by country29 View Post
    has anybody checked the thermostats? or engine fan?
    Thermostat is fine and the fan hub was rebuilt when the EGR was changed out.

  9. #19
    Bobtail Member
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    If your pulling the rad--new cores are reasonable for price if you shop around--even a 4-core if you need--i've never had any luck taking rads out to clean and then still having a heating problem--do it right the first time and you'll be glad you did!

  10. #20
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    I'll find out this week most likely if the cleaning with the pressure washer did any good. Company left me sitting all last week after I refused to lay down in Florida for 4 days when they couldn't find me a load out of there after they had already been looking for three days with no luck. Like I told them, I'm not the guy if they can't keep the truck moving. If I have to be away from home, I'm working. PERIOD..!!!
    Anyways, if they can get me going.... I'll cross my fingers and hope that I get better cooling after cleaning the cooling fins out this week.

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