no way the replacement gasket I got goes on the inside rim of the cooler. Fits fine on the outside ring. Are there two separate sizes?

 

is the part # the same as the one pictured ? no other o-ring or other sizes for that type of oil cooler . should be just that very one installed in the same location as pictured . Is your oil cooler oem ?

 

I have heard it called both ways

 

Look at this diagram,
21304 part code is the Oil Cooler O-Ring it's the only one, there is no other for these cars
http://grubbsinfinitiparts.com/nissa...5/J2130084.jpg

 

it goes behind the oil filter housing (oil cooler)

 

I got it finally. It's not exactly the "fit" I was expecting for an o-ring. Oil leak solved.

 

First, thank you for posting this excellent procedure. Second, I found the oil cooler o-ring (Dorman copy) at Rockauto for $4.50 delivered. ($2.77 plus shipping). The OEM Nissan part was available on Amazon for $10 plus shipping.

 

sweet rte up, but one question? when i did mine i did all the steps correctly but did i have to to the coolant flush all over again? i did it because the G started to over heat again. i dont know if i missed a step or did something wrong but some help would gladly appreciated

 

You have to bleed the cooling system, I'll post details tomorrow and get a mini write up ..stay tuned brotha , I got you ..

 

Thanks bud !!!!

 

DidG35, I have the same observation about the o-ring 21304JA11A not fitting the inner ring and looks like it would fit the other ring (the one Jaygotboost cleans with a Q-tip on the picture). So you did install in on the inner ring? I just can't picture it..... I have a 2005 G35, but I don't think it makes a difference.

 

After struggling for too long trying to fit the O-ring part number 21304-JA11A bought on Ebay, I went to the dealer to but the same exact part.
After coming home, I found out the one fromthe dealer was actually smaller and fit snugly on the inner ring of the oil cooler. The one I bought from E-bay seem to only fit in the outer ring, where it doesn't belong.
The one from e-bay came was in Nissan OEM bag. just like one I bought at the dealer, not sure what happen....

 

I have to do this because mine is leaking. The dealer told me that it was the upper oil pan gasket and did mention the oil cooler gasket leaking.

 

Step 5 / Picture #1 shows where the old o-ring in Orange is currently installed and new o-ring goes in exact same spot . Qtip was just me cleaning the whole thing

 

Doing my oil change change today, found out that I have oil leak. Glad to see this diy oil o ring. Btw, anybody know how to bleed the cooling system?