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Old 07-10-2011, 09:41 AM   #1
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coolant filter valve

I have a 1997 Monaco Windsor with an 8.3 Cummins engine. I am cleaning my cooling system and have drained the coolant, added the cleaner, and flushed it after running the engine for a couple of hours. Now it's drained and I removed the set screw holding the coolant filter valve. I can't move the coolant filter valve to drain the pressure to the filter. I HAVE to do that so that the pressure in the filter is down, but the valve is stuck. I sure don't want to break the handle to the valve, but the darn thing won't budge. Does anyone have a fix for me?
I'd sure appreciate a response here or via email. atlasven@me.com

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Old 07-11-2011, 03:07 AM   #2
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Try using a penetrating oil like PB Blaster on the valve threads and let it soak for awhile. Over night would be good, if you give it a couple doses.

Mike, RVIA & RVSA Certified Master RV Technician
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Old 07-11-2011, 10:07 AM   #3
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Common problem. Mine has been frozen for 9 years at least.

I just twist off the filter encased with a ziplock bag. I might lose a pint of coolant at most.

Then have the new filter ready and spin it back on.

Or....I could free up my broken valve, buy a new one made of brass rather than plastic, remove coolant and replace the valve.

I am too lazy for that hassle.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
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Old 07-11-2011, 10:22 AM   #4
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If it's rubber hose up to valve, pinch it off
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Old 07-11-2011, 02:36 PM   #5
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coolant valve

If you look on the side of the filter housing next to the oil filter there is stops on the valve, using a wrench on this end is less likely to break the valve. Been there and done that. About 50.00 bucks at cummins parts house if you break it. Good luck. Dan
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Old 07-12-2011, 08:34 PM   #6
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I want to thank all who replied to this post. I tried PB Blaster but it didn't work. I finally just forced the filter off and put on a new one. It seems to be the only sensible and economic thing to do. I talked to Cummins and they said that it could be a costly mess to try to get the valve off. Hats off to you all.

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