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It's a water filter
Hey Joel,
The small filter next to the oil filter is the water or coolant filter. It sets on a separate base and if you look above the filter on the base there will be what looks like a valve handle coming out from the base. This is the shut off for the filter. It turns 90 degrees (more or less) and it shuts the coolant off. Remove the filter w/o shutting it off and you will get a bath. BUT be careful, I have seen them stick and break. It is sealed into the filter base with o-rings that can stick from lack of use. If you are running an extended life coolant you can simply install a blank filter, or add its replacement to you maintainence schedule if your coolant is green. The filter is there to add the necessary DCA to the system versus having to add a liquid DCA to the system thru the rad cap. There are test strips to check the levels (search this website) that you can get at NAPA, truck shops, Cummins in their Fleetguard catalog, any where big rigs get worked on.
I could go into great detail about why you need the DCA, but it's been written about before here. Just add it to your schedule, most big truck I work on get it replaced anywhere from yearly to 2-3 times depending on the levels tested in the coolant. And if you have more than several years on green coolant, I would change it and start over. If you buy your coolant from a truck shop or look at NAPA you can find it precharged with DCA. Then you just install the filter and test it several months down the road. If you buy automotive coolant you have to add liquid DCA according to you systems capacity.
Hope it helps,
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1998 Signature 42' M11 450hp - -pulling 25" enclosed trailer with SCU sandcar inside
Lovely Wife, 2 kids, 3 dogs, 2 cats
Diesel Mechanic to the stars
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