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Old 11-28-2013, 10:33 AM   #1
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Motorhome rookie

I just purchased a 1998 Fleetwood Discovery 36A motor home with a 5.9 Cummins Diesel with 275 hp. Is there a filter for the coolant? I am interested in doing oil changes and fuel filter changes, as well as air filter changes. Never having a diesel before, I am not sure which filter is for what. Are there any pros to help get me started? thanks in advance.
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Old 11-28-2013, 10:54 AM   #2
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Welcome to the forum, and congrats on your purchase.

Most Cummins use fleetgaurd filters on there engines. Them first two letters on the filter part # is a good indicator to what they are.

LF- is a lube filter
FF- fuel filter
WS- water separator for fuel system
CF- coolant filter

You can go to fleetgaurds web site and cross reference the filters you have on there to double check.
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Old 11-28-2013, 03:35 PM   #3
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spectrum581

The Cummins ISB engines don't require a coolant filter. They don't have the counter-bores/sleeves/liners that the piston travels up and down in as the large block diesels do, so the coolant additive from a filter isn't needed nor do you need to check coolant for the additive. The purpose of the additive is to prevent cavitation of the liners which, if allowed to happen for any period of time will cause a leak through the lower seal and the fix is very costly.

Having said this though it is important that you keep your coolant system full and clean and flushed periodically to assure top performance.

As a side note you should also keep an eye on your CAC and radiator stack for accumulated oil/dirt build up from the engine blow-by as it will cause you and over heating condition.

Hope this has helped and have a Happy Thanksgiving.

Tom and Barb
2000 Bounder 39Z
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Old 11-28-2013, 04:55 PM   #4
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If you go to the Cummins website with your engine serial number you can get all the information about your engine and download a manual too. Same for the Freightliner chassis,with your VIN number they can tell you all about the vehicle, from axles to shocks, air brakes, etc.
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Old 11-28-2013, 07:19 PM   #5
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welcome to irv2
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Old 11-28-2013, 09:10 PM   #6
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Also scroll down to "forum jump", check out Fleetwood owners and the Cummins forums..
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