Heater Hose Check Valve? - Dodge Cummins Diesel Forum
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post #1 of 15 (permalink) Old 05-23-2019, 09:44 AM Thread Starter
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Heater Hose Check Valve?

Hey fellas,

This morning, I went to clean up the heater hose nipple before reinstalling it in the head. This is the one next to the valve cover, behind the thermostat. Hot water going to the core. I looked inside it and noticed there was a little rubber washer floating around inside a machined groove. I pulled it out with a pick tool, it's clearly a seat for a check valve but the ball and spring are missing. Quickserve calls out this part as "3916256 - Plain Hose Coupling" and Google doesn't bring up any pictures of the part I have. All the other nipples I was able to find at the shop (in core 12v heads) look exactly the same. Black rubber valve seat, no ball or spring. Anyone seen this or know about this? I don't care if there's a ball and spring lodged in my heater core but I would like to replace the part with a new one if it's broken.

A check valve there would be nice, I imagine it would keep coolant vapors from collecting in the core when using the block heater.


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post #2 of 15 (permalink) Old 05-23-2019, 10:14 AM
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That's a new one to me. I've never looked inside that fitting, but I don't see any need for a check valve there. Also, if it is a check valve I don't think Cummins would call it a plain hose coupling.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles. Started the second million on 8/24/13
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post #3 of 15 (permalink) Old 05-23-2019, 10:28 AM Thread Starter
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Yeah, that added to my confusion. It's clearly not "plain," but I would have to say that if that is incorrect, it would be the first instance of a part number being incorrect on Quickserve that I have noticed.

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post #4 of 15 (permalink) Old 05-23-2019, 10:32 AM
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It's too bad this didn't come up before I changed my water pump a few weeks ago. I could have disconnected the heater hose and took a look at mine.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles. Started the second million on 8/24/13
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post #5 of 15 (permalink) Old 05-23-2019, 10:37 AM Thread Starter
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Another thing is the one place I found this part for sale has it listed for $28. Even from Cummins, standard barbs and fittings are normally less than $10.

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post #6 of 15 (permalink) Old 05-23-2019, 10:42 AM
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There is no check valve in #3915256.

It is not a "plain coupling"; the comma between "coupling" & "plain hose" indicates it's either a straight coupling or a coupling for a plain hose.

I've seen the Cummins "plain" description refer to the fitting for an elbow/straight section at times, such as #3918267 or #3918266, for example.

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post #7 of 15 (permalink) Old 05-23-2019, 10:53 AM Thread Starter
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This is what Quickserve showed me:



It also indicates it supersedes 3911250. Is it perhaps the case that mine's the old part (I'm 95% confident whatever I have in-hand is supposed to be a check valve) and it was superseded with a standard one because they were all falling apart? You seem to have access to better info, any further light you could shed would be appreciated.

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post #8 of 15 (permalink) Old 05-23-2019, 11:00 AM
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I do have a couple of #3916256 fittings laying around at my other place, I'll rattle them & check when I'm there next.

As far as your attached image in the post above, here's what I see when I click on it - the first image indicates a coupling would be a worthwhile endeavor; the second image, not so much.
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post #9 of 15 (permalink) Old 05-23-2019, 11:16 AM Thread Starter
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Weird, there shouldn't be a link to click on. I just have IMG code there. Trying the attachment method...
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post #10 of 15 (permalink) Old 05-23-2019, 12:33 PM
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It appears that the "plain" refers to "straight" as far as the coupling itself goes, as opposed to a 90 degree coupling.

Superseded #3911250 shows the same description "Coupling, plain hose" as well, indicating it's a straight coupling just like the current # 3916256.

The 3911250 appears to have been obsoleted in 1988, before the first Cummins equipped Dodge pickup was released.

The parts catalog diagrams are from a 91.5 first gen NOS Chrysler publication, which lists the "updated" 3916256.

The "plain" (straight) coupling #5 is differentiated from the "elbow" coupling #12.

I did find the one I removed from my pickup, right after I did my forward location heater inlet line fitting delete.

It has a internally grooved base, with a 4 pronged captive washer that should serve as a flow restrictor. No check valve, no O-ring though, and the washer on mine is magnetic, not rubber.

Heater Hose Check Valve?-img_2531.jpg

Heater Hose Check Valve?-fullsizeoutput_ce0.jpg

Heater Hose Check Valve?-fullsizeoutput_cdd.jpg

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post #11 of 15 (permalink) Old 05-23-2019, 12:53 PM Thread Starter
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Interesting. Thanks for looking into that.

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post #12 of 15 (permalink) Old 05-23-2019, 04:16 PM
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Pic of the domestic made #3916256 I bought a while back, installed, then removed after a year to make room for the NPT fitting with 3/4" hose barb outlet it was replaced with.

The current fitting part # packs I have are marked "Made in China".

Observe fittingz quality rustz proofz black oxide finishz, and OEM Mopar red SAE threadlockerz still present inside thread groovez, beats current chineziumz Scummingz fake CADz platingz all day long.


Attachment 848517
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