Mdrouin Report post Posted October 2, 2018 I am trying to build a list of people who have had a valve failure or are concerned they may in the future. Please post here or message me if you can. Share this post Link to post Share on other sites
five Report post Posted October 3, 2018 I read on one of the forums that several years ago Cummins finally admitted the ISX had valve problems. They fixed it by changing the ISX from 650 HP to 600 HP plus some internal changes. Share this post Link to post Share on other sites
manholt Report post Posted October 3, 2018 FIVE. IMHO, 650 to 605. The 600 was before the 650! Share this post Link to post Share on other sites
obedb Report post Posted October 3, 2018 I remember two members having serious $$$ problems with ISX engines. Do not know how to look that up, but I bet Carl does. Share this post Link to post Share on other sites
manholt Report post Posted October 4, 2018 Scroll to top of this page and enter ISX in search box. Share this post Link to post Share on other sites
jleamont Report post Posted October 4, 2018 The ISX also had Ceramic plunger failure within the fuel injection pump that would send ceramic shards into the crankcase and would ultimately destroy the engine. These were all HP ISX, I can’t seem to figure out the year range. The ones I had experience with were 450hp and around 2009. They did eventually redesign the pump, not sure what year. Share this post Link to post Share on other sites
five Report post Posted October 4, 2018 13 hours ago, manholt said: FIVE. IMHO, 650 to 605. The 600 was before the 650! Carl, I can only address Amer Coach, but in 2013 through 2018 the ISX was 600...excluding model year 2014, when AC did not offer an ISX. Cummins came out with the 605 in 2016, but AC just started using it (as a 605 and not a 600) in 2019 model year. We saw the new 605 at Spearfish in August. A number of our members have the 650 in earlier model coaches, usually Heritages, and have had problems. Share this post Link to post Share on other sites
deenad Report post Posted July 30, 2019 My ISX 650 has been rebuilt 3 times in 58,000 miles. Last time was pre emptive as Cummins couldn't tell me if they used the upgraded parts in 2015. After disassembly the Cummins shop said it was only a matter of time before it broke a valve off. The #6 liner was acidcetched enough to feel with your finger and the others were showing some problems. Only had about 6,000 miles since the last rebuild in 2015. Late wife had liver cancer so we didn't get out much. Driven about 5,000 miles since the rebuild earlier this year and it is running much better than ever before. In 4 years I've spent $53,000 for engine repairs. Premier RV in Junction City OR has had two break valves off and the big Foretravel dealer in Nokadoches (sp?) has had one. My CC is #6999 and I know the owner of 6998 '09 Veranda and his broke in 2016 at 12,000 miles. I've reported it to NHTSA and one other site. Share this post Link to post Share on other sites
deenad Report post Posted July 30, 2019 (edited) On 10/3/2018 at 4:03 AM, FIVE said: I read on one of the forums that several years ago Cummins finally admitted the ISX had valve problems. They fixed it by changing the ISX from 650 HP to 600 HP plus some internal changes. Actually they fixed the CM871 EPA 2007 models by redesigning the valves with new, stronger materials, redesigning the head and new programming. They also came out with new carbon scraper liners and matching pistons which I had installed in mine. Edited December 3, 2019 by deenad Year changed from 2017 to 2007 Share this post Link to post Share on other sites
manholt Report post Posted July 30, 2019 To my knowledge the old ISX 600 & 650 was the same engine. Also, the last CC models that came off the assembly line, was after going Bankrupt in early 2007! The CC Veranda came with a 500 or 600, non of the 500's had problems! A friend bought the 500 Veranda for $290k cash, brand new...no warranty! Sold it in 2014 for $395k & bought a CC 2005, 630! Share this post Link to post Share on other sites
lakebuster Report post Posted September 18, 2019 Only ISX-15 I heard of having the problems were the models rated for 650 HP. Have not heard of the 600 HP or lower HP models having the valve problems! Share this post Link to post Share on other sites
jleamont Report post Posted September 18, 2019 It was ALL ISX models that had problems, the problems depended on HP or year. The problems were different depending on HP. higher HP had Valve problems. They ALL had Ceramic Plunger issues with the injection pumps (this was based off of the engine year, not HP), camshaft issues and the list goes on.. below are a few examples on lower HP engines. Example 1; https://highwayandheavyparts.com/n-12896-cummins-isx-problems-and-failures.html Example 2; http://www.competitiondiesel.com/forums/archive/index.php/t-163822.html Example 3; https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2409873 Share this post Link to post Share on other sites
deenad Report post Posted December 3, 2019 On 7/30/2019 at 3:23 AM, manholt said: To my knowledge the old ISX 600 & 650 was the same engine. Also, the last CC models that came off the assembly line, was after going Bankrupt in early 2007! The CC Veranda came with a 500 or 600, non of the 500's had problems! A friend bought the 500 Veranda for $290k cash, brand new...no warranty! Sold it in 2014 for $395k & bought a CC 2005, 630! Actually CC produced up through at least May 2008, which is when my Magna with ISX 650 was produced. The highest number of Magna I know of was 7032, which also had an ISX 650 and has dropped a valve in #6 twice. Being fixed by Cummins this week with a reman engine. Share this post Link to post Share on other sites
manholt Report post Posted December 3, 2019 Deen. They all (Monaco) produced new coaches, after BK, until they ran out of chassis...without warranty. 2007-10 on CC, 2009 on Beaver, 2008 Holiday Rambler, not sure about Safari but suspect 2007. Most makes & model's was bought by Navistar, who sold to Allied and it's still owned by Allied who turned the Motorhome division over to REV Group, who today also have Renegade, Fleetwood & American Coach (div of Fleetwood). Tiffin and Winnebago, did not file for Bankruptcy! CC, Beaver & Safari, was not resurrected, by Navistar or Allied. Share this post Link to post Share on other sites
rayin Report post Posted December 4, 2019 Read the truckers forums, for more information. Talked to the owner of a HDT repair shop today about the ISX problems. He said they are now sure the NOX reduction stuff(SCR) required be EPA was causing the problems. He went into great detail, describing what the inside of a failed ISX looked like; I cannot remember everything he detailed. A company in Florida figured out how to delete that, and was widely advertising their work. A trucker was caught without it, admitted where and who did the delete. The company was fined $200,000, then required to go back and re-install everything on every truck they worked on, to the tune of approx $6 million, they filed bankruptcy instead. That's what I was told, true? I doubt the man would lie about something that easy to verify if one wanted to spend the time. Share this post Link to post Share on other sites
bm02tj Report post Posted December 4, 2019 Not all tree hugging things are good maybe a few are ok Share this post Link to post Share on other sites
manholt Report post Posted December 4, 2019 Ray, scroll back up & read Joe L. post...he's the expert. bm02tj. Conservationists are fanatics, most don't have a clue,, except for second & third hand information...Had to deal with them all the time, when I was working. EPA is a bloody disaster... Share this post Link to post Share on other sites
rayin Report post Posted December 4, 2019 5 hours ago, manholt said: Ray, scroll back up & read Joe L. post...he's the expert. bm02tj. Conservationists are fanatics, most don't have a clue,, except for second & third hand information...Had to deal with them all the time, when I was working. EPA is a bloody disaster... OK, what I was told is inline with what Jlamont posted. That shop owner said when they took apart this one particular ISX,they had to chisel out the deposits on the EGR valve manifold opening. I have no dog in this fight, however, it sounds to me like a class-action is overdue. Share this post Link to post Share on other sites
manholt Report post Posted December 4, 2019 The 600 & 650 is now the 605 and I have heard nothing bad with it. Have a lot of friends with that engine in both Newmark & Tiffin, they all run 15k to 20k miles per year! Share this post Link to post Share on other sites
jleamont Report post Posted December 4, 2019 The ISX was discontinued. The replacement is the Cummins X15. Supposedly this is bullet proof with its designs. Time will tell.... https://www.cummins.com/engines/x15-performance-series-2017 Share this post Link to post Share on other sites
manholt Report post Posted December 4, 2019 OMG, that's a lot of engines in the X series to chose from, low to high HP, high to higher Ft. Lbs! I'm impressed. I looked at the X12, 450 HP at 1750 Torque! WOW That's 500 lbs more than the old 400 series at 1250...question is, can you run it with the Allison 3000? Share this post Link to post Share on other sites
dickandlois Report post Posted December 4, 2019 Carl, The 3000 input Torque is 1700 Ft. Lbs. The correct torque converter should solve the torque the transmission see's Rich. Share this post Link to post Share on other sites
jleamont Report post Posted December 5, 2019 We have a few on order. If they prove themselves I’ll let you know. Share this post Link to post Share on other sites
jleamont Report post Posted December 10, 2019 Sure is pretty Share this post Link to post Share on other sites
