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Thread: 600 horse cummins

  1. #1
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    600 horse cummins

    We are looking at a 07 Kenworth heavy spec tractor...seems the C15 is getting hard to find in the newer trucks.. This cummins motor decent?Truck has about 130 K on it. Any trouble to look forword to? Is the Interbrake option the same as the retarder on the C15? I'd appreciate some good input. Thanks!

  2. #2
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    Cummins has their own integrated jake brake that works awesome. I don't know of a driveline retarder available for the ISX. A c15 needs the brakesaver (driveline retarder) in addition to the jake to out brake the ISX. I will say that a good overhead does wonders to the ISX performance and fuel economy. I'd recommend not waiting til 200,000 miles to get the overhead done. I went from a ok engine to understanding what people were talking about the ISX.

  3. #3
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    I own a fleet of KW T-800 and WL-900 tractors all Cummins powered with 525hp N-14's and 600hp ISX's. The ISX is a very good engine with a ton of power,but as good as it is it can't hold a candle to the N-14's when it comes to durability. After being in the business for over 40 years,the Cummins N-14 is the best,most durable truck diesel engine I have ever seen.In fact,other than the odd leaking accessory drive seal or a cam follower box leaking a bit at around 700,000 miles,we have never had one that needed a rebuild before a million miles. BTW/I never owned a CAT (1693-TA,3408-TA or any version of the 3406) that went much over 700,000 miles without a catastrophic failure.

  4. #4
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    Thanks for the information. The only problem Ive got now is my long legged driver says he cant sit in the KW..... On the cat millage thing we have about 850 on our Pete with the C15 and is doin ok.. rolled rods and mains at 500 .Thanks again for the info and any more would apreciated

  5. #5
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    Just stay away from the isx cm2250 engine (the new common rail engine ) it is plaged with problems, we have seen nothing but failures with this one.
    like TCS said the N-14 is by far the most trouble free of the bunch. the isx cm870 (erg and air actuator turbo) is ok, the egr valve and cooler is the weak point but there are ways to delete this to be more reliable. the isx cm871 (electric turbo actuator and dpf) has a few issues with regens/emissions, turbos and coolers. All these engines have a problem with camshaft flaking/rocker follower break down, just monitor with a yearly inspection. When the jakes start to feel weak we have found that the valve rocker shafts detent holes for the jake wear out of round and leak oil pressure, replace the shafts and control spools and springs and the jakes will work like new again. Just a light touch on some issues with the isx

  6. #6
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    I own a fleet of t800 s and 379 s along with some Pete and Kenworth dump trucks but all trucks are ummins powered I have n-14 525hp ISX 600hp ISX15 600hp and some little ISL s cummins are a good motor I had trucks with cat motors in the 90 s and 80 s when cummins had the dreaded 444 but cummins 600hp are great motors

  7. #7
    Senior Member truckdoctor's Avatar
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    I worked on a fleet of heavy spec trucks at the last company I was at. They were just starting to switch over from Cat to Cummins with their newer trucks. We had two ISX's that would continually eat egr coolers. Normally we didn't find out until they sucked coolant and locked up the engine. I remember one of the drivers called me and was telling me that he was having power problems while hauling a crane. While I was asking him what was going on and trying to figure out the problem over the phone, it lost the cooler and locked up. We had to send another truck after him to finish hauling the load. There was onlr one truck that we didn't have that problem with and I believe it was because all he pulled was an end dump. Both of the heavy spec trucks were inframed each time they locked up which was at roughly 100,000 and 200,000 miles.

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