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Old 04-22-2016, 06:13 PM   #1
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Why does Cummins ISB 6.7 have two oil drain plugs

I'm preparing to change my oil for the first time, and I might figure this out with my reading of documentation. But, I notice that the oil pan has a drain plug on the side and one on the bottom. Why both?

I guess that if you are worried that your drain pan is too small, you could drain from the upper plug first and then store the oil in a container and then open the lower plug.
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Old 04-22-2016, 11:05 PM   #2
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Do you have a picture? You drain the oil from the bottom plug in the pan. Here's a tutorial link.
http://www.tildee.com/Vxkrrd
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Old 04-23-2016, 09:42 PM   #3
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I've only noticed and used a drain plug on the bottom of the pan.



Rich
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Old 04-23-2016, 09:45 PM   #4
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Also, 3 gallons aren't enough for our engines. 16-18 qts.


Rich
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Old 04-24-2016, 02:08 PM   #5
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I didn't take a picture, but here is the material from the Quickserve.cummins site. The plug on the side is an M22 and the one on the bottom is M18.

Also, when I read the Cummins documentation, it says that there are two oil pan sizes for the ISB 6.7. It seems to imply that I have the small one, but I want to be careful, since I couldn't find anything bigger than a 15 litre drain pan, and the small oil pan holds 13-15 litres.
Attached Files
File Type: pdf 73719870*-*Oil Pan.pdf (196.4 KB, 85 views)
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Old 04-24-2016, 02:25 PM   #6
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Quote:
Originally Posted by gordonsick View Post
I didn't take a picture, but here is the material from the Quickserve.cummins site. The plug on the side is an M22 and the one on the bottom is M18.

Also, when I read the Cummins documentation, it says that there are two oil pan sizes for the ISB 6.7. It seems to imply that I have the small one, but I want to be careful, since I couldn't find anything bigger than a 15 litre drain pan, and the small oil pan holds 13-15 litres.
As any other oil change goes, drain it, change the filter, fill it with the 3 gallon, run it for a minute, then shut it down for 2 minutes and recheck level on the dipstick. Top off if necessary recording the added amount. Use a permanent marker and write on the upper radiator support of the total amount of quarts or liters it needs. I also write the size of the drain plug for different vehicles.
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Old 04-24-2016, 03:09 PM   #7
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Your engine has other applications beyond pick-ups. Draining off the bottom plug may not be an option in certain applications.
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Old 04-24-2016, 04:22 PM   #8
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Send a message via Yahoo to bob caldwell
Maybe a port for an oil temp gauge...
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Old 04-28-2016, 05:15 PM   #9
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Remember it takes more than 3 gallons to fill. Make sure you read your OWN info for the correct set up. My 340 will not hold as much oil as a 360 will. As for the extra plug I have no idea why it is there but as you know use the bottom one. If you wanted make a call to Cummins with the last 6 of the vin and they can tell you about the plug and how much oil yours holds.
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