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Insight on a Cummins N14

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Old 09-21-2010, 06:07 AM   #16  
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Tim
The only other grief I have experienced with the N14, besides timing sensors and push tubes from overspeed, is the wiring behind the engine, leading to the battery box.

Yeah, that special wire that provides all the power to everything electronic... and is the only place that green doesn't mean GO.

But yeah, bulletproof.

I will use your vernacular from a response you made in a post I did about a ground cable. "Ground effect widow maker", just on the power side. I love the way the ecm power line is routed.


Hope things are well for you up in the Great White North.
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Old 09-22-2010, 01:15 AM   #17  
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Scott, check the idle oil pressure with the engine at full operating temp. It should be right around 20psi then 40 above 1000 rpm.
I've never seen a Cummins, let alone a N-14 hit close to 40 psi. Humm...
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Old 09-22-2010, 12:03 PM   #18  
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I've never seen a Cummins, let alone a N-14 hit close to 40 psi. Humm...

I have NTC motors making 100psi on cold start, then running 60+psi all day long. Any N14 I have ever dealt with that was in good mechanical order has always made 40 psi over 1000-1200 rpm. We have a 2001 Pete 359 with an N14 460hp, it has made 50 psi on cold start since it left the dealer lot new and runs 40-45 all day long, 400k on it now with well over 22k hours on it. Chevron Delo 400 and Hastings filters are the only oil and filters ever used on it.
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Old 09-22-2010, 12:40 PM   #19  
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I've never seen a Cummins, let alone a N-14 hit close to 40 psi. Humm...
I guess you havn't driven many cummins. In 35 yrs thats all we have bought & my N-14 runs 40 psi all day long while under load. Granted the big cam 3 I had before this one ran at 38 psi I had 350 before that one & a 290 before that & they all ran close to 40psi.
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Old 09-27-2010, 09:42 PM   #20  
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N14 in later years (2001-2002) is statistically one of the most reliable HD truck engines ever made. The warranty data proves it.

Also the later ISMs were exceedingly reliable.

If you have any questions on 2010 or current generation Cummins HD engines (15L 11.9L) then I can probably help you a bit on that. I eat, sleep, and breathe those things (fuel system) all day, every day.
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Old 09-28-2010, 01:17 PM   #21  
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N14 in later years (2001-2002) is statistically one of the most reliable HD truck engines ever made. The warranty data proves it.

Also the later ISMs were exceedingly reliable.

If you have any questions on 2010 or current generation Cummins HD engines (15L 11.9L) then I can probably help you a bit on that. I eat, sleep, and breathe those things (fuel system) all day, every day.
Thanks Justin. As I'm wading thru all the truck ads, I'm hoping that whatever I find will have that N14 in it. What's the scoop on the late 90's and early 2000's M series motors? Are they somewhat small? I see some of them putting out in the 400HP range, but if they're a small motor I'd think the reliability and longevity would suffer.
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Old 10-05-2010, 08:56 PM   #22  
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Ms have always been in the 11L range, going back to the M11, then later the ISM.

The ISM has a sterling reliability record in recent years. The latest version is still new, but the models up to 07 were very good units. The 425hp rating should work well for you.
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Old 10-06-2010, 06:57 PM   #23  
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the 4000 series Allisons in the new fire trucks with 500hp ISM's looks to be a killer combo.
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Old 10-07-2010, 05:12 AM   #24  
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As an update to the whole thread, I'm going to look at a truck on Monday that has an ISX in it. Naturally, it's the only motor that hasn't been discussed here.
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Old 10-07-2010, 01:40 PM   #25  
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I guess you havn't driven many cummins. In 35 yrs thats all we have bought & my N-14 runs 40 psi all day long while under load. Granted the big cam 3 I had before this one ran at 38 psi I had 350 before that one & a 290 before that & they all ran close to 40psi.
Yeah, your right. I've only owned 3 N-14s and driven several hundred N-14s and ISXs the rest of my 18 year driving career. I guess all the gauges are off on these new trucks that I don't drive. Operating oil PSI is lucky to hit 38 and most times runs about 35.
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Old 10-07-2010, 01:42 PM   #26  
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As an update to the whole thread, I'm going to look at a truck on Monday that has an ISX in it. Naturally, it's the only motor that hasn't been discussed here.
ISXs have had an issue with EGR coolers. (our new ones are still having issues) If the truck eats coolant, check it.
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Old 10-07-2010, 05:31 PM   #27  
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ISXs have had an issue with EGR coolers. (our new ones are still having issues) If the truck eats coolant, check the it.
The 'it'? Can you elaborate?
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Old 10-07-2010, 07:10 PM   #28  
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it = the egr cooler.
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Old 10-07-2010, 07:25 PM   #29  
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Yeah, your right. I've only owned 3 N-14s and driven several hundred N-14s and ISXs the rest of my 18 year driving career. I guess all the gauges are off on these new trucks that I don't drive. Operating oil PSI is lucky to hit 38 and most times runs about 35.

35psi is about right. That's what the regulator is typically set to.

More oil pressure isn't a good thing if you don't need it. Think about it-- if you can lube the engine successfully at 20psi, what's the advantage of 40psi?

Where does the work to make that oil pressure come from? How about from the fuel your are burning?

Lower psi= better mpg.
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Old 10-07-2010, 07:29 PM   #30  
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ISXs have had an issue with EGR coolers. (our new ones are still having issues) If the truck eats coolant, check the it.

Cummins has devoted a TON of effort into the EGR coolers. Lots of testing and experimenting, and even a change of suppliers to improve the quality.

If the truck eats coolant, the EGR cooler is the first place to look.

But the 2010 products have *vastly* improved EGR coolers over the 07 products (I'm pretty sure the 07 coolers have been improved also for svc).

The EGR coolers were eating Cummins' lunch on warranty cost. Lots of incentive to fix it, and some *really* smart people working on it (not me-- legitimately smart people).

JH
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