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Old 12-24-2018, 11:40 AM   #1
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ISX Yes or No

Final stages in purchasing 2012 Newmar with ISX 600 . Total trouble free miles are 62,000. Engine oil and coolant analysis are being checked but have not received the report at this time. Cummins forum on the ISX are raising doubts.
Undecided about the purchase at this time but would like to make the purchase.
I can afford repairs but really donít want the headache. Am I being to cautious?
Thanks for advice.
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Old 12-24-2018, 03:12 PM   #2
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Quote:
Originally Posted by dcleaner View Post
Final stages in purchasing 2012 Newmar with ISX 600 . Total trouble free miles are 62,000. Engine oil and coolant analysis are being checked but have not received the report at this time. Cummins forum on the ISX are raising doubts.
Undecided about the purchase at this time but would like to make the purchase.
I can afford repairs but really donít want the headache. Am I being to cautious?
Thanks for advice.
Read on the American owners site that the 600 and 650 ISX are swallowing the #6 Valve because it has heat build up...cost to repair per the site is 25k to 40 k to fix...C
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Old 12-24-2018, 03:38 PM   #3
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Quote:
Originally Posted by dcleaner View Post
Final stages in purchasing 2012 Newmar with ISX 600 . Total trouble free miles are 62,000. Engine oil and coolant analysis are being checked but have not received the report at this time. Cummins forum on the ISX are raising doubts.
Undecided about the purchase at this time but would like to make the purchase.
I can afford repairs but really donít want the headache. Am I being to cautious?
Thanks for advice.
I have an ISX that did have the valve issue. If you get the engine build date or the engine number I can tell you if it has the updated valve.

Does it need DEF? It is a 2012 but may have a 2009 or 2010 built engine.Other than the valve it has been a great engine.

I went from a 39' with a C7 getting 6 to 7 mpg in a 25 to 30k pound motorhome. Ran good but you hit a hill or want to pass someone and no dice. Now I have a 50k pound motorhome that gets 5.7 to 6.5 mpg and will pass people up a hill. Going through PA / NY on 81 I set the CC at 65 and when I hit a long hill it just groans a bit and hold 65.

If it has 60k plus you may be safe. If it has the older valve expect 15k to 25k for a new head and EGR cooler. I paid 25k for updated, head, injector, cylinder, piston, turbo and ERG cooler at a Cummins shop.

I would recommend trying to knock it down 25k more if it has the older head. Then have it done. Ours runs cooler and smoother with the new head. At the end of the day it's a great engine that was rushed to meet the EPA requirements and the valve is the weak link.
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Old 12-24-2018, 06:06 PM   #4
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We have a 18 London Aire with the new X15 engine. Have been RVing for over 40 years and have had Newmar diesel coaches for over 20. Owned a truck/auto service location for 25 years plus taught auto/truck tech. for 14 years. ISX problems in the RV area has to be well below 5% and the 650 HP seems to be the worst with the damage. I would be a little concerned but would go a head and make the deal.
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Old 12-24-2018, 06:26 PM   #5
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Get them to drop 50 off the price. At least then its worth your trouble if something happens.
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Old 12-24-2018, 06:29 PM   #6
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The older CM871's (DOHC) are the problematic ones. The newer SOHC ones aren't as troublesome although i have seen someone with the ISX12 that has been out of commission for almost a year now getting repairs.
So far my 650 has done it twice, once under warranty and one for $33,000, 2,530 miles after we bought it. Now it's exhibiting more definitive symptoms of about to happen again after almost 4 years but less than 5,000 miles. Seems Cummins can't verify the new parts were used to rebuild mine so I need to have it redone at my cost again. Budgeting $25,000 for it in Feb.
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Old 12-24-2018, 08:32 PM   #7
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Thanks to everyone. I will get the build date and or the engine number as soon as I can so the valves can be identified. Also this engine does use Def. An NRVIA inspector is performing a pre buy inspection including oil and coolant analysis. I will
Update as I move forward.
Thanks
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Old 12-24-2018, 08:42 PM   #8
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Thanks to everyone. I will get the build date and or the engine number as soon as I can so the valves can be identified. Also this engine does use Def. An NRVIA inspector is performing a pre buy inspection including oil and coolant analysis. I will
Update as I move forward.
Thanks
Mine passed an oil sample 2,600 miles before the valve broke.
If the engine takes DEF then it shouldn't have a problem and is a SOHC engine.
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Old 12-24-2018, 09:20 PM   #9
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So if the engine takes DEF ,does that automatically mean that the engine has the good valves and it should not have valve problems ? Should I still get the build date and engine number ?
Thanks
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Old 12-24-2018, 09:30 PM   #10
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So if the engine takes DEF ,does that automatically mean that the engine has the good valves and it should not have valve problems ? Should I still get the build date and engine number ?
Thanks
In a word (or two) only Cummins knows and they won't talk.
See my earlier post, #6 above.
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Old 12-25-2018, 05:42 AM   #11
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So if the engine takes DEF ,does that automatically mean that the engine has the good valves and it should not have valve problems ? Should I still get the build date and engine number ?
Thanks
The failure is related to the emissions method. Heat and acid cause the failure. The single cam uses DEF so the system is different, not sure how.

But the valves are the same. Here is a link to a summary of when the new valves with engine numbers came in.

http://www.engineprofessional.com/TB/TB040318-2.pdf
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Old 12-25-2018, 09:03 AM   #12
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Great information Mark D , thank you for the knowledge and shared information. Would a
detailed engine analysis report performed by Cummins Power Center also be helpful ? Just asking, I have no problem investing for more information if it’s needed.
Thanks
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Old 12-25-2018, 11:15 AM   #13
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Great information Mark D , thank you for the knowledge and shared information. Would a
detailed engine analysis report performed by Cummins Power Center also be helpful ? Just asking, I have no problem investing for more information if itís needed.
Thanks
Probably not. Mine was running 100% until it wasn't.
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Old 12-25-2018, 11:25 AM   #14
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And, as I said earlier, Cummins can not verify which valve was used in the heads. Add that to the fact that Cummins uses old inventory first so in my timeline of an early 2015 rebuild it would he possible to get the newer head and the older valves.
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