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Old 04-24-2017, 08:03 AM   #15
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I do not know if your coach still has an EGR (Exhaust Gas Recycler/cooler) or not. I have an 08 cummins 425 and when my coach began loosing coolant on a regular basis, that was the culprit. A cummins authorized motor fixer put in the redesigned cooler and it has been fine since. You may not have it if your rig uses DEF. jmo mark
Our dutch star had about 50K miles on it when the EGR became the issue. The replacement cost was about 4500 and that included parts and labor. mark
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Old 04-24-2017, 09:03 AM   #16
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Cummins liners are not forgiving if the coolant is not maintained bought my 08 Diplomat 2 yrs ago and the first thing I did was drain the radiator and refill with long life coolant problem solved no more testing or adding supplements especially on the ISL with no coolant filter
So my 9ISL does not have a coolant filter ?
I thought on my PDI they talked about a filter.
Guess I will have to dig into that more.
Thanks
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Old 04-24-2017, 09:27 AM   #17
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When my friend bought a 07 with a 400 ISL I was shocked to find it didn't have a coolant filter started checking with Cummins and found they deleted the filter from this line of engines. So the test strips and adding supplements or changing to the long life coolant is very important. Just looked at a friends new Tiffen on a Freightliner chassis and it came from the factory with the red coolant
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Old 04-24-2017, 12:35 PM   #18
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When my friend bought a 07 with a 400 ISL I was shocked to find it didn't have a coolant filter started checking with Cummins and found they deleted the filter from this line of engines. So the test strips and adding supplements or changing to the long life coolant is very important. Just looked at a friends new Tiffen on a Freightliner chassis and it came from the factory with the red coolant
Red coolant, no coolant filter on this ISL engine. Will inquire with Cummins as they put it back together about long life coolant. I don't want to have to go thru this again!

Thx for the tips and advice folks. Will update this and let you all know how it ends up.
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Old 04-25-2017, 09:19 PM   #19
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This cooling system issue is for all Cummins engines except for B series.
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Old 04-25-2017, 09:26 PM   #20
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Results of not keeping the SCA's in the proper range:
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Old 04-25-2017, 09:34 PM   #21
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But you didn't replace the cylinder head and all six liners I'll bet. The OP has a 2011 and has (according to his statement) had ithe Coolant checked along the way and now the liners are shot. Hmmmm, just doesn't sound right to me.
Unless the OP checked the SCA's himself he can't really know if it was done or not. In a Class 8 truck they usually have to add enough coolant over the course of use that the SCA's are kept in bounds.
Another thing to watch out for is the expiration date on the test strips, they have a very short lifespan and I've found expired ones at the local Cummins shop. Had to ask them to get me pack of four that weren't expired.
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Old 04-25-2017, 09:35 PM   #22
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This cooling system issue is for all Cummins engines except for B series.
With CAT the 3126 and C-7 are parent bore engines also, no SCA's required for them.
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Old 04-25-2017, 11:21 PM   #23
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re: coolant "filter", yes Cummins deleted this add-on to keep their engines price competitive against cheaper brands, but the engine casting still has the boss for it and many have had it added after purchase.

At least up to 2007 build year (usually 2008 model year coaches) you can add a coolant DCA cartridge called a coolant filter. The flange for the filter is plated & gasketed off; Cummins has a kit, just ask for it.
IIW toddb, I'd do that while engine is being re-sleeved. Then put filter cartridge change on regular PM list.
I check mine w/strips, and yes the strips have a short (in comparison to our coolant change cycle) shelf life, so I buy the 4-pack from a NAPA that has a truck parts counter and toss at least 2 of them out for out of date.

FWIW, I've never changed 100% of coolant. My DCA stays w/in range per the strips. I use the radiator petcock, drain all coolant that comes by gravity which is about 7.5gal or maybe 60%, then refill (my regular mechanic takes the used coolant to recycle). Been doing that every 3-4 years since new w/2 test strips every year (2nd strip is to verify the 1st strip result). YMMV.
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Old 04-26-2017, 01:29 PM   #24
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This cooling system issue is for all Cummins engines except for B series.
What is a "B series" engine?
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Old 04-26-2017, 01:32 PM   #25
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What about the Gen Set on these coaches? They are diesel also. Do they need to be checked and the coolant changed on a regular basis also?
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Old 04-26-2017, 01:56 PM   #26
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What is a "B series" engine?
The B series is the 5.9 engine. They don't have sleeves that are replaceable.
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Old 04-26-2017, 02:04 PM   #27
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What about the Gen Set on these coaches? They are diesel also. Do they need to be checked and the coolant changed on a regular basis also?


Yes, they are diesels but they are not wet sleeved designs and don't require SCA/DCA. Most owners will use the same coolant as they use in their engine just for simplicity. There is a schedule for coolant replacement.
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Old 04-26-2017, 02:44 PM   #28
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The B series is the 5.9 engine. They don't have sleeves that are replaceable.
Specifically any Cummins labeled ISB, where the B is the key letter. The newer Dodge trucks use a 6.7 ISB, so it's not restricted to just the 5.9. In fact, the 4BT 4 cylinder used in many commercial delivery vans is also an ISB.
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