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Old 01-08-2019, 10:11 AM   #15
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Originally Posted by vito.a View Post
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?
Had an ISC 350 in my '02 DSDP. After 4 years I put a Banks kit on it and went another 9 years with no problems. The Banks kit brought it to 435 hp and 1200 ft lbs.
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Old 01-08-2019, 10:14 AM   #16
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Originally Posted by oldsman41 View Post
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.
I found that the Cummins "system" doesn't have anything done out of warranty. I've tried it with my present rig.
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Old 01-09-2019, 11:47 AM   #17
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I have the CAPS 350HP ISC, year 2000 RV-- I went through the leaking lift pump gasket issue, which is a pretty easy fix. Otherwise have had no issues, and like the engine.

It is on the low end of power for a 40ft RV, but does OK.

I have about 140,000 miles. I would not hesitate to buy it again.

thx Dale
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Old 01-10-2019, 05:11 AM   #18
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I haven't had any engine problems nor tranny problems in the few years we've had our mechanical 8.3. Seems to be a solid engine. A buddy has a early electronic isc and hasn't had problems with it and he's had it for 16 years.
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Old 01-10-2019, 04:54 PM   #19
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Thanks for the responses. The units Im looking at are 1996-2004 because of cost mostly. Im leary of the rest of the repairs but hope that Im up to the task of keeping things in shape. The caps system has a reputation of being expensive if it fails so I was concerned.
The bad thing is many of the used units I have found have no service records so are a crap shoot.
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Old 01-10-2019, 05:01 PM   #20
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Try to find one with 50-80k miles.
Bust it off and immediately check oil pressure and look for blowby. Oil pressure should be 75plus cold and 15 warm at 600rpm.

Check condition of belts and airfilter. If it's been ignored those won't prob be fresh..

Go for a drive, make sure it pulls 25lbs, no smoke and change the oil asap after purch. And maybe do an oil analysis

it will prob out live you.
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Old 01-11-2019, 09:03 AM   #21
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when post above says 25 lbs -- he means 25lbs (BOOST)-- mine displays 24.6 at full boost, and oil pressures as similar to what he stated.

My guess is that on an older Cummns ISC equipped RV you will spend a lot more on AC's. refrigerators, shocks, suspension, tires and such, than you will on the engine -- be prepared for those costs.

If the RV is on a Spartan chassis of that age, look at, research, and discuss the front ball joints on the IFS. If the boots are severely cracked or gone you will have a $3000 issue that only a limited number of RV places will touch.

all these subjects have been covered many times on this site -- research a lot but don't be scared off by the research that makes it sound like all older RV's are junk. They are not, however reasonable care should be taken. You really mainly hear about the complaints on all sites like this -- not the many happy people.

my thoughts --- Dale
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Old 01-13-2019, 01:33 AM   #22
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I have a friend who buys and sells generators online, auctions etc. Whenever he sees a generator with an ISC he does all he can to buy it. The ISC in a generator doesn't have the caps, I don't think, emission thing. But he says that the ISC is bullet proof. Our coach has the isc and other than a small fuel leak so far so good. I have to say that it is a solid motor. We bought coach with 80,000 ish miles and she is close to 100,000 now and other than seasonal oil and filters has been great. Also, with a fresh battery she lit up with no smoke or cough in 22 degree weather two years ago. I wouldn't hesitate to own another ISC. We love our coach!
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Old 01-13-2019, 10:36 AM   #23
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I've heard that the ISC is one of the most reliable engines out there.

I wonder if the OP is confusing the ISC with the ISB? 53 block
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Old 01-19-2019, 03:42 PM   #24
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I find the thread interesting in that a am "sorta" looking at other RV's and they have ISL"s. I am thinking to myself do I want to give up the reliability I have in my ISC for an ISL --- all relative I guess.

thx Dale
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Old 01-19-2019, 03:48 PM   #25
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They are really the same motor. The L has like a .4 inch longer stroke. Aside from the wristpin issue, the Ls are just as robust. From a power standpoint its probably about a wash, early Ls were in slightly bigger units and later ones while uprated to 425 are usually saddled with DEF/DPF
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Old 01-19-2019, 03:50 PM   #26
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1993 Mechanical C8.3. Rock solid.
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Old 02-05-2019, 05:43 AM   #27
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Have a 08 Tuscany 8.3 360hp. had in for service and they told me to get manifold checked, this was a small IH dealer in Canada. Iam from Pa. does anyone know cost of replacement Manifold? Art
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Old 02-08-2019, 06:39 AM   #28
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Have a 08 Tuscany 8.3 360hp. had in for service and they told me to get manifold checked, this was a small IH dealer in Canada. Iam from Pa. does anyone know cost of replacement Manifold? Art
I've seen quoted prices from $750 to $1500. I think there is a big variable depending on radiator configuration and ease of access.
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