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Old 07-10-2007, 02:45 PM   #1
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Does the Cummins ISL 400 on our Coaches have a coolant filter? How much coolant do I need? I'm changing to Fleetguard Optimax. (reminds me of my last 2-stroke Mercury that blew it's power head here on Lake Powell. Now run a Honda 4-stroke on the bass boat)
All comments will be most appreciated.
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Old 07-10-2007, 02:45 PM   #2
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Does the Cummins ISL 400 on our Coaches have a coolant filter? How much coolant do I need? I'm changing to Fleetguard Optimax. (reminds me of my last 2-stroke Mercury that blew it's power head here on Lake Powell. Now run a Honda 4-stroke on the bass boat)
All comments will be most appreciated.
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Old 07-10-2007, 04:13 PM   #3
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Our 03 40fdts has an ISL 400 engine. and it does have a coolant filter. Cant tell you how much coolant to use. However if you buy Fleetguards coolant make sure it is not the "premixed" type, meaning it has already been cut with 50% water. Convenient but costly. There is no reason why any good antifreeze should not work perfedctly well. When you change the coolant filter you will be adding a chemical additive package to the coolant at the same time. BTW the filter is located up high on the side of the block. They are usually hard to unscrew, so have patience.
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Old 07-10-2007, 04:52 PM   #4
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Stretch- ScumMike here. I was told the ISL in mine has no coolant filter. Where on the block is it (right, left, fore, aft) and what does it look like? SM
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Old 07-10-2007, 05:01 PM   #5
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SM

This is for Stretch......it looks like a filter!!!

Just kidding. Mines on the drivers side up high, mid engine, IIRC just under the exhaust manifold? But we have a lowly ISC 330.
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Old 07-10-2007, 05:27 PM   #6
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">I was told the ISL in mine has no coolant filter. </div></BLOCKQUOTE>

If your ISL has the Final Charge Extended Life Coolant, then there is no filter.
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Old 07-10-2007, 09:29 PM   #7
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Mike: I think I read where the newer ISLs dont have a coolant filter. Really no need for it any more. A while back Cummins had a severe problem with electrolysis eating thru the wet sleeve cylinder liners. The coolant filter/conditioner has/had a sacrifical annode plus a soft water chemical pack that was designed to slow down the electrolysis. After Cummins solved the problem with a new alloyed liner the filter was not needed. I guess my 03 ISL 400 may have been among the last.
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Old 07-11-2007, 08:49 AM   #8
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Thanks guys for your input. I think I've found the answer. The engine takes 11.5 qts of coolant. By using the Optimax coolant, no filter is needed. The gen-set uses 4.2 qts of coolant so 4 gal. is a perfect fit.
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Old 07-11-2007, 06:32 PM   #9
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Chris:
You still need to find out if you have a coolant filter on your engine. If you dont change the spin on filter the steel canister will eventually rust out or electrolysis will get it. The spin-on can is the thinest metal in the cooling system. And again, the word "filter" is a misnomer. It is really a chemical treatment for the cooling system.
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Old 07-12-2007, 06:53 AM   #10
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Hello Chris:

I think the amount you indicated for coolant of 11.5 gts is incorrect you probably mean 11.5 Gal. My ISC 350 takes 10 Gal of 50/50 mix of coolant. So I but in 5 gal of coolant and 5 gal of Distilled water. You will need at least 5.5 gals for the engine and .5 gal for the gen if you mix it with water. Unless you purchase the premix coolant than you will need to purchase about 13 gals for both engine and gen.
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Old 07-13-2007, 08:22 AM   #11
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I just service the cooling system in my gen-set. I never buy the pre-mix because when you flush the cooling system you can never remove all the coolant from the engine. I add 100% coolant to the system in the quantity to achieve a 50/50 mixture then top off with distilled water.
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Old 07-13-2007, 08:26 AM   #12
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It's time to have my coach engine coolant serviced. I'm looking to have it done this summer in the Eugene OR area, any recommendations?
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Old 07-13-2007, 02:05 PM   #13
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Danny,

Cummins Northwest,
91201 Coburg Industrial Parkway
Coburg, OR 97401
Coach Care (R.V.) Toll-Free 866-236-2167

4 miles north of Eugene on I-5 at exit 199.
They are next door to Marathon Coach plant and across the street from the Monaco plant.

Cummins Northwest
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Old 07-18-2007, 10:01 AM   #14
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Dave F:
My Cummins manual says 11.5 qts. of coolant (engine only) page 7-8 Cooling System. Does the other app. 8 gal. go in the radiator and surge tank?
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