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Old 09-23-2021, 03:49 PM   #1
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Wax valve help

Trying to learn what wax valve will work in my 2001 Country Coach, 8.3 350 turbo. Sauer Danfoss 553/1/09857/210 seems to be the one, but will others work also, like the 190 or the150. ??? If you have knowledge about these valves I would appreciste your advice.
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Old 09-23-2021, 07:34 PM   #2
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This is right out of my manual

"The wax filled thermovalve is mounted at the top of the radiator sensing
coolant temperature. The thermovalve controls the action of the switchingvalve. When the radiator is cool the hydraulic fluid is allowed to flowthrough the inlet and outlet ports of the thermovalve and return to thehydraulic reservoir. As the coolant temperature inside the radiator rises toapproximately 185° the wax inside the thermovalve begins to melt and
expand. This begins to restrict hydraulic fluid flow through the thermovalve. The restricted hydraulic fluid pressure then begins to move the internal spool valve of the switching valve. The process will continue until coolant temperature inside the radiator reaches approximately 199°F. At this temperature hydraulic fluid flow through the thermovalve is stopped, moving the spool valve to full open position"

Whether you can use a different thermovalve, my guess is yes, it will just change what temperature your system runs at.

My thermovalve is B5531-09857-210 also. My engine normally runs ~183F but will go up when pulling a grade.
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 09-23-2021, 08:57 PM   #3
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My valve was installed by Source Engineering. Typical Cummins installation here Source Engineering Inc | Custom RV Chassis | Eugene, OR
Here are a couple of pix installed on a ISC in a Country Coach. Norml temps run around 180 and since install, I have never seen 200 even on a hot day, long climb.
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2002 Country Coach Intrigue
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Old 09-23-2021, 10:01 PM   #4
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The last three digits are the temp it operates at. Yours at most should be a 190. I think mine is a 180. Fully closed at 193, fan on full high.
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Old 09-25-2021, 09:40 AM   #5
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I have seen the last three numbers of engine thermostat is 180. So is there any advantage of a 210 over the 190???
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