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Old 05-30-2022, 06:31 AM   #1
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Oil Drain Plug - change it out?

Good morning. I've changed the oil on my Cummins ISB6.7 a couple of times already. To be honest, during both oil changes I didn't bother looking that close at the drain plug to get a sense of its condition. It is currently doing well holding the 15 quarts in the pan. My first question is are these replaced occasionally even if it is holding up well since the last oil change? If I recall correctly from my last oil change and if my assumption of the pic below is correct, there is a rubber gasket up against the plug head. Is the gasket replaced instead of the plug? I know this is a basic oil change 101 question, but I don't want to perform the next oil change and find a slow leak that I will need to address. The price for these are all over the place. Sites selling Cummins parts are selling the OEM plug for ~$32 plus shipping. Some sites catering to the diesels in Dodge trucks have them for $15 plus shipping but I don't know if they are OEM. Part # 3973071. Just curious what others do (besides the Fumoto option). Thanks



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Old 05-30-2022, 06:44 AM   #2
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no need to replace it if it isn't leaking.

I'm not sure if the rubber is integrated into the drain plug or if it can be bought separate. On some vehicles there is a crush washer you replace when you drain the oil. Seems Cummins eliminated that with the rubber gasket, which probably won't be an issue for a very long time (10 plus years)
I know you don't want a leak but if it does, it most likely will show itself as a drip and probably a small one initially. May not even seen a spot on the ground just oily around the pan when it does start to fail. Can't hurt to have a spare so if you ever see it start you can swap it out on the the next change.
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Old 05-30-2022, 07:00 AM   #3
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I'd think keeping an oil resistant o-ring that engages the inner edge of the pan contact area handy would be adequate insurance.
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Old 06-01-2022, 07:12 PM   #4
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I'd think keeping an oil resistant o-ring that engages the inner edge of the pan contact area handy would be adequate insurance.
After you need one is too late.
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Old 06-02-2022, 02:13 AM   #5
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After you need one is too late.
62 years of changing my own oil. 38 vehicles, 2 fleets, NEVER had a catastrophic leak from a drain plug, OR any kind of drain plug leak. Did have a rubber Fram oil filter gasket on a 2002 fail. Some of those vehicles accumulated over 300K miles with Mobil 1 oil changes every 5-7K, dependent upon oil analysis, so hundreds of oil changes.
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Old 06-02-2022, 05:49 PM   #6
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Thanks everyone. Yes I agree wimpy, definitely wouldn’t expect a catastrophic failure. My question was simple, but I screwed up the way I asked it. Was wondering if others that have the same plug simply change the rubber gasket (not listed on parts diagram blowup). If so, where did they get it? Or, just keep on using the existing drain plug. The only issue I want to avoid is at some point if I don’t change it, it will start leaking. It will most likely be noticed after disturbing it after doing an oil change. Then I live with the leak until the next oil change or I drain the 15 quarts, replace it, then put the oil back in (not ideal). The rubber gaskets eventually will crack etc. Not super worried about it and will likely use the one I have on the next oil change. Just figured I’d use this forum to figure out what others do. I suppose after the next one I’ll just buy another plug and be done. Still have 6 months left on this one, so I’m good for quite some time. Thanks for the feedback from all of you. I appreciate it.
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Old 06-03-2022, 04:48 AM   #7
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That is the same drain plug on my Cummins ISC 8.3L

The copper crush washer for that oil drain plug is Cummins part number 3920773 which is a common size that can be found at any auto parts or Ace Hardware store.

You can use the copper or the black or red synthetic crush washers as well.
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Old 06-03-2022, 06:00 AM   #8
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That is the same drain plug on my Cummins ISC 8.3L

The copper crush washer for that oil drain plug is Cummins part number 3920773 which is a common size that can be found at any auto parts or Ace Hardware store.

You can use the copper or the black or red synthetic crush washers as well.

Thanks! This is exactly what I was looking for.
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