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Old 09-28-2013, 07:20 AM
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Default Cummins QSB 5.9 425HP - 850 Hours

I am thinking about selling the original port Cummins QSB 5.9 425HP motor in my boat. The motor has 850 hours and is a 2007.

How do I go about doing this? Are there dealers, etc. who are in this business?

Jim Senker

Last edited by Jim Senker; 09-28-2013 at 12:16 PM.
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Old 09-28-2013, 07:43 AM
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Why does it need to be replaced with only 850 hrs
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Old 09-28-2013, 09:03 AM
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The engine runs perfectly. I blew my starboard engine this summer and had it replaced with QSB 5.9 that produces 485HP and 3400 rpms. The new motor is the same exact block and same weight and has different injectors and compression and therefore produces more torque. The boat performance with just one faster engine, with more torque, is significant enough that I am considering replacing the port engine if I can get enough money out of it.

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Old 09-28-2013, 09:53 AM
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The engine runs perfectly. I blew my starboard engine this summer and had it replaced with QSB 5.9 that produces 485HP and 3400 rpms. The new motor is the same exact block and same weight and has different injectors and compression and therefore produces more torque. The boat performance with just one faster engine, with more torque, is significant enough that I am considering replacing the port engine if I can get enough money out of it.

Jim
I believe you have been told wrong, I believe the only difference is software. The injection system is common rail and I believe the injectors are the same. As is the compression if I am not mistaken.
The difference between the 420 and 485 and the lower hp of those engines is in the cooling system and raw water pumps, or so I have been told by my Cummins people. I am just going on the info I have been given.
And also a different turbo on the lower HP QSB's. I believe. But what I was told by my Cummins salesman was the 420 and 485 were the same just different software.
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Old 09-28-2013, 10:06 AM
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There is no 485 rating, just 425 and 480. I believe that Capt Wilde is 100% correct, the software is the only difference unless there is a major age difference, in which case some minor fittings will be different.

You would need to pay a Cummins dealer to uprate the motor. It is pretty expensive due to warranty issues but certainly nothing like the cost of taking an engine out and putting in a new one. Find an authorized dealer or better yet call Cummins Power Systems, the mid-Atantic distributor, and discuss the uprating issue with them. Have your serial numbers (both engines) on hand when you call.
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Old 09-28-2013, 10:07 AM
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You may be correct - I've been told what the differences are between the two motors and may be mistaken in my description. I spent 6 weeks on this project and frankly, I am not a diesel guy and just wanted to fish again.

The thing about the software, and I am aware of that, is that Cummins has yet to come up with the necessary software to get the new motor to perform like the original motor. It' been 5 weeks now and something makes me think they are not going to come up with it.

Jim
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Old 09-28-2013, 10:10 AM
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480 it is. I've spoken with the guys in Glenn Burnie and they tell me it is not possible to turn the 425 into a 480. I can tell you there is a difference in the confirguration of the turbo in the new motor from the existing motor. I don't know if that plays into this or not.

Jim
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Old 09-28-2013, 10:23 AM
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480 it is. I've spoken with the guys in Glenn Burnie and they tell me it is not possible to turn the 425 into a 480. I can tell you there is a difference in the confirguration of the turbo in the new motor from the existing motor. I don't know if that plays into this or not.

Jim
What is the CPL number on the data plate for each engine? That will be a major clue as to whether the uprating is possible.
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Old 09-28-2013, 11:30 AM
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Originally Posted by Jim Senker View Post
You may be correct - I've been told what the differences are between the two motors and may be mistaken in my description. I spent 6 weeks on this project and frankly, I am not a diesel guy and just wanted to fish again.

The thing about the software, and I am aware of that, is that Cummins has yet to come up with the necessary software to get the new motor to perform like the original motor. It' been 5 weeks now and something makes me think they are not going to come up with it.

Jim
I don't see why this would keep you from using the boat .

"The thing about the software, and I am aware of that, is that Cummins has yet to come up with the necessary software to get the new motor perform like the original motor "
Are trying to down rate the new 480 ? or up rate the 425 ? I belive soft ware is the only diff.

Why not check with Tony over at boat diesel , he know more about Cummins the most .
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Old 09-28-2013, 12:07 PM
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In response to the last 2 posts - I have previously talked to the experts at Cummins in Glenn Burnie MD. I believe it was Wes Denton and he said the original port motor cannot be upgraded to run at 480HP and 3400 rpms. I don't recall the specifics but I do know that this guy has been at Cummins 43 years and flies around the country to solve their marine motor problems and is widely recognized as their best expert on these motors.

To the second post from prowlersfish - I have run the boat twice with the new motor and am very pleased with the performance which is why I am considering replacing the original port motor. The software would down rate the new 480. I have had numerous emails with Tony at Boat Diesel and spoke with him about a month ago when I was in the process of assessing why the starboard motor failed. He was terrific and helped me out quite a bit!!!!

Jim
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Old 09-28-2013, 12:12 PM
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In your first post ..you asked how do you replaced your port engine...then you later post that you changed your starboard engine .... so how is it possible that you don't "know how to go about changing an engine"?????
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Old 09-28-2013, 12:15 PM
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I did this too quickly this morning - I want to know how to sell my original port motor.

Thanks,

Jim
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Old 09-28-2013, 12:16 PM
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Boat diesel.com
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Old 09-28-2013, 12:17 PM
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makes sense. Thanks.
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Old 09-28-2013, 12:22 PM
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Seems kind of odd that they would replace the 425 that blew up with a 480, especially without trying to get you to install 2 480's. They could have installed a remanned 425. Then you would have had the same engines on both sides.

Spend the money and get a new 480 so both sides match. Your gal got a new diamond ring for one hand. She needs one for the other.
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Old 09-28-2013, 12:26 PM
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That's too funny - the new 480 motor is a remanufactured motor.
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