Lower oil pan gasket replacement - Chevy and GMC Duramax Diesel Forum
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Old 05-16-2011, 10:50 AM   eBay Motors  #1 (permalink)
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Lower oil pan gasket replacement

I've got oil seeping from the lower oil pan. I've heard the upper pan gasket is a motha' to replace, and that the lower is much easier, but it still looks like a tight fit for the cross bar just below the pan. Can someone help me out with a procedure? Thanks much.

Also, any recommendations on RTV gasket material (namebrands)?
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Old 05-16-2011, 11:44 AM   eBay Motors  #2 (permalink)
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Remove the crossmember, then remove the bolts to the lower oil pan. Once the bolts and nuts are removed, get a flat "Putty Knife" to "cut" through the sealer between the upper and lower pan, it needs to be pretty flat so you don't bend or damage the pan. Then remove the pan.

To remove the upper pan you need to remove the tranny as there are two bolts that go into the pan from the back through the bottom of the tranny adapter.

I use GM Sealer, it is pretty sick stuff, I think the part # is GM P/N 12345739
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Old 05-16-2011, 11:54 AM   eBay Motors  #3 (permalink)
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Thanks bigdaddydiesel. Is the crossmember just an un-bolt and remove operation?
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Old 05-16-2011, 12:03 PM   eBay Motors  #4 (permalink)
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Yes sir, you'll need an 18mm wrench and socket or two wrenches, but just unbolt the two bolts oneither each side and drops right out...
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Old 01-24-2014, 04:10 AM   eBay Motors  #5 (permalink)
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There is no gasket on the lower oil pan. The AC Delco Sealant is great stuff, a little pricy at $16+ per tube, but it works. When you have the pan off you need to clean everything and let the motor drain out. When you put the sealant on and bolt on the pan you must let it cure for at least a day before adding fresh oil. There's a YouTube video for the "banana pan" install that has a couple of tricks for getting the pan off, but it's pretty easy.
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Old 01-25-2014, 02:28 PM   eBay Motors  #6 (permalink)
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My rear oil pan is leaking to but I was told my upper was leaking as well... Everyone ive talked to said u have to pull the motor to replace the upper seal... Any ideas or advice?
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Old 01-26-2014, 04:51 AM   eBay Motors  #7 (permalink)
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The lower pan is a snap....the upper is a bear. My local dealer said three grand. Yikes!
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Old 04-02-2014, 06:23 PM   eBay Motors  #8 (permalink)
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doing the lower right now looking for torque specs. one thing I learned with oil pans is torque or it ing leaks lol or you over tighten it and it still leaks and bows the pan. I bought a lower pan gasket from vatozone(15$) and buffed off old rtv, going to put a bead of rtv on pan mainly for ribs and then gasket so I don't have to buff upper oil pan again should be nice for future reference.
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Old 04-02-2014, 06:30 PM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by GarrettSanchez View Post
doing the lower right now looking for torque specs. one thing I learned with oil pans is torque or it ing leaks lol or you over tighten it and it still leaks and bows the pan. I bought a lower pan gasket from vatozone(15$) and buffed off old rtv, going to put a bead of rtv on pan mainly for ribs and then gasket so I don't have to buff upper oil pan again should be nice for future reference.
Garrett the torque spec from Alldata for the lower pan bolts and nuts is 10 N-M or 89inch pound
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Old 04-02-2014, 09:36 PM   eBay Motors  #10 (permalink)
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Factory specs call for 89 INCH pounds... There is no gasket. They are put together by robots and only use the factory ACDelco Sealant ( P/N 10-2010 ). The ACDelco stuff is great, but pricy $16-21 a tube...the most important thing is to let the sealant cure for 24 hours before you put oil back in the crankcase otherwise it will not cure properly because it needs air to cure. The oil level is an inch or so above the area where the lower and upper oil pans meet so unless the sealant cures properly it will leak.
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