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Old 02-22-2021, 07:17 PM   #1
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Radiator cap Isl9-400

Hey guys,
Had the coach serviced two days before we left from Havasu to Bolsa Chica state beach. I went to check the oil and found my radiator cap was missing from the overflow tank. I looked in my service manual and there is no info on the cap. So I will ask, what is pressure for this system? And is it a standard size that I can pick up from a auto parts store? I am amazed that the level in the tank is not low. Thank God it was not hot during this trip!

Thanks
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Old 02-22-2021, 07:56 PM   #2
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Pretty sure mine is 16psi.
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Old 02-22-2021, 08:33 PM   #3
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My oil fill cap was off after an oil change.
Lucky for me it had a cord holding it. It stinks you have to look over the work of so called professionals.
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Old 02-25-2021, 09:14 PM   #4
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I run a 7lb to keep from splitting the plastic tank.
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Old 02-25-2021, 10:31 PM   #5
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Quote:
Originally Posted by shootist View Post
I run a 7lb to keep from splitting the plastic tank.
After a lot of research on line I found a Cummins ISL manual, it says 13 pound minimum. This is for water pump cavitation controll around the wet liners.
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Old 02-26-2021, 06:36 AM   #6
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Replaced our overflow tank with a metal replacement. It came with a 16 PSI cap from Veurinks RV Center. I would agree with Shootist's thinking on protecting the "plastic" tank, but would personally run with Mit12's research into what Cummins has to say about it.

In most situations where numerous options exist, there will be one that is based on factual information, and the Cummins specification, complete with the back-up reasoning, is pretty concrete input. Thirteen PSI or more and you should be good to go!
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Old 02-26-2021, 04:29 PM   #7
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This is right out of the Quickserve manual for my ISC..
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Old 02-26-2021, 10:59 PM   #8
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The ISC is not a wet liner engine like the ISL so they do not have the same issue with cavitation around the liners that the ISL has.
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Old 02-27-2021, 06:30 AM   #9
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Quote:
Originally Posted by Mit12 View Post
The ISC is not a wet liner engine like the ISL so they do not have the same issue with cavitation around the liners that the ISL has.
Actually it is. the ISC and ISL are exactly the same base hardware. The L is only a longer stroke.

Quote:
w.rvtechmag.com › tech › 27_coolants
The reason for this is that larger engines create more heat and the wet sleeve ... like the 8.3 liter Cummins ISC, 8.9 liter Cummins ISL, etc all use wet sleeves.
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Old 02-27-2021, 06:56 AM   #10
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….wont comment on ISC vs ISL--but suspect both are wet sleeve engines....not sure what "normal duty" vs "light duty" means but since both are an option, I would go with the temp rating--I occasionally see temps above 110F during longer, steeper climbs on hot summer days....so I run a 15lbs cap on my ISL with a steel expansion tank....
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Old 02-27-2021, 09:10 AM   #11
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Quote:
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I occasionally see temps above 110F during longer, steeper climbs on hot summer days....so I run a 15lbs cap on my ISL with a steel expansion tank....
110 or 210F ?
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Old 02-27-2021, 09:14 AM   #12
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Quote:
Originally Posted by jimmy braden View Post
Actually it is. the ISC and ISL are exactly the same base hardware. The L is only a longer stroke.

CORRECT.


Only the Cummins B engine is a parent bore engine.



All larger Cummins engines ARE wet liner engines.
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Old 02-27-2021, 09:20 AM   #13
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I stand corrected. When I looked for information on this the sire I got said that the ISC was not a wet sleeve block. I guess I got bad info.
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Old 02-27-2021, 04:13 PM   #14
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Somewhat aside, but not completely, I wonder how an older engine even can take advantage of the higher pressure. Since the main 'advantage' of a higher pressure cap is allowing a higher coolant boiling point and most pre tier 4 motors are not really designed to run over 205 degrees (mine never gets above 195) I dont see what it offers. I cant imagine that a water pump can generate 15 psi of jacket pressure running at the cruise rpm of most ISC/ISL diesels. AN ISB maybe..

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110 or 210F ?
I think he mean surface temps..

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