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01-06-2019, 07:47 AM
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#1
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Senior Member
Join Date: Nov 2018
Posts: 129
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Paranoid about early ISC 8.3 Reliability
Ive been looking at older DPs most have either a mechanical 8.3 or the early electronic isc. I feel relatively confidant of the mechanical one but the seemingly endless stories of the isc problems make me wonder if its a time bomb waiting to go off. If I stay mechanical im stuck with a very small selection of decent coaches, the newer engines give me more selection of units and features but I dont want a disaster in the making. How bad are the early ISC,s?
Im not ready to full time yet so this would be a weekend travel machine but once a year have to go on a longer 3000 roundtrip.
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01-06-2019, 08:11 AM
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#2
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Senior Member
Join Date: Jun 2018
Posts: 251
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Where I work we have 4 8.3 engines, 3 mechanical injection, 1 with the caps fuel system. 3 of these are in fire trucks, so they are driven hard. The guys don't care about it, just get there fast. The 4th one is in a vactor truck, pretty much overloaded at all times. All 4 of these engines have been great. When I was looking for my motorhome I was looking for an 8.3 because of my experience at work. I ended up getting an 8.9. I would not hesitate to get either one.
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2002 Holiday Rambler Imperial 38PKD
370 Cummins ISL
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01-06-2019, 08:22 AM
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#3
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: May 2015
Posts: 245
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I have a 170K on my ISC plenty of power with no problems. Take the chance and roll the dice.
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2004 Travel Supreme DS04
2014 Jeep Grand Cherokee Summit
2002 Newmar DSDP 4095 Cummins ISC 350
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01-06-2019, 10:17 AM
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#4
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Senior Member
Join Date: Mar 2013
Posts: 168
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The key word in your post is "seemingly". Not sure where you are getting your information. These engines are renowned for being bulletproof. I have the CAPS era ISC 8.3 uprated to 350 hp which is the most Cummins will authorize. In 18 years it has seen 85K trouble free miles.
Out of the hundreds of things that can go wrong on these complicated machines, that big diesel engine back there is the last thing I think about.
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2000 HR Imperial 38 WDS
350 Cummins, Aero Muffler & AFE Filter
980 watt solar, 600 amp/hr LiFePo4, Victron
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01-06-2019, 11:35 AM
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#5
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Senior Member
Newmar Owners Club Fleetwood Owners Club
Join Date: Jul 2013
Location: DFW
Posts: 1,473
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What years are “early”?
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2009 Fleetwood Excursion 40E
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01-06-2019, 11:42 AM
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#6
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Senior Member
Join Date: Aug 2016
Posts: 107
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Cummins
First off the 8.3 is a good workhorse they do fine in moderate sized Motorhomes. I know guys with small dump trucks that overload the trucks bad and the motors grunt and groan but dont give up. You will have a hard time killing one in a Motorhome unless the previous owner did no maintence what so ever.
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01-06-2019, 11:50 AM
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#7
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Senior Member
Texas Boomers Club Holiday Rambler Owners Club
Join Date: Jun 2002
Location: What? Like right now? ;-)
Posts: 1,302
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1999 thru prob 2004 coaches are likely to have an ISC and some an ISL both based on the caps fuel system. And as long as you dont have any leaks at the pump housing, they just work. After 2005 you are more likely to have some type of particulate filter and more electronics for injector control.
Mine gets 9.3mpg at 62cruise for the last 6000 miles (2 trips to maine and back from tx). Rarely downshifts on hills and then will still stay 56mph at 25lbs of boost.
Its not the drivetrain you need to worry about. Most coaches that age are starting to need major repairs. You better be prepared to throw some $ at it.
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2003 Scepter 40PDBB - Roadmaster RR8S - Cummins ISC350 - purch aug16
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01-06-2019, 11:54 AM
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#8
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Senior Member
Join Date: Jul 2018
Posts: 4,875
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ISC? Great engines.
The problem child Cummins seems to be the ISX; there seems to be cylinder 6 valve failure problem with them in motor homes...
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2005 Four Winds Majestic 23A
“To the world you may be one person; but to one person you may be the world.” - Dr Suess
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01-07-2019, 07:21 AM
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#9
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Senior Member
Join Date: Dec 2016
Location: Las Vegas, NV
Posts: 350
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I absolutely love my 8.3 ISC — 350 HP. No DEF and no DPF.
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2000 Country Coach Intrigue "The Beast"
40 ft Cooks Delight - 350HP ISC Cummins
Coach #10984
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01-07-2019, 08:36 AM
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#10
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Senior Member
Spartan Chassis
Join Date: Feb 2010
Location: Fort Worth
Posts: 1,584
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Quote:
Originally Posted by apatz
I absolutely love my 8.3 ISC — 350 HP. No DEF and no DPF.
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DITTO for my 2004!
__________________
2004 38DS04 Travel Supreme
Cummins 8.3 ISC 350HP CAPS
Spartan Mountain Master
2023 F-150 Towed
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01-07-2019, 04:28 PM
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#11
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Senior Member
Monaco Owners Club
Join Date: Oct 2009
Location: Tucson, AZ
Posts: 6,558
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The 8.3L Cummins ISC is a great engine. The only common problem with the Cummins ISC is a cracked exhaust manifold. Just change it to the newer design.
Some folks are still running a Banks kit on on an ISC with over 400hp.
Are you confusing the ISL wrist pin issue with the ISC?
__________________
97 Monaco Windsor- Sold
07 Monaco Executive McKinley- Sold
04 Monaco Signature Chateau IV
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01-08-2019, 09:12 AM
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#12
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Junior Member
Join Date: Jul 2014
Posts: 26
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Hello - how do I know if I have an old or new design of the exhaust manifold ??
Thanks
Alan
2002 ISC 350
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01-08-2019, 09:16 AM
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#13
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,626
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Quote:
Originally Posted by apatz
I absolutely love my 8.3 ISC — 350 HP. No DEF and no DPF.
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So far, so good!
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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01-08-2019, 09:53 AM
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#14
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Senior Member
Join Date: Aug 2016
Posts: 107
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8.3
Alan you can have Cummins check out the manifold for you and tell you if it a new style if the person had it done at a Cummins shop it will be in the records system.
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