M54 upper coolant hose O-Rings size?
 

Hello guys can anyone tell me what size O-ring is required for the upper coolant hose on M54B30? My hoses are in excellent condition but I have a slight drip from the deformed O-rings around the tip of the expansion tank. I'm sure they are o-rings because I was changing the expansion tank soon and I found them to be deformed but still connected them but started to swim... Please if you can give me the size in millimeters because i am from Europe I am talking about. OEM No. 11537500733

You can get complete o-ring kits for coolant overhaul I haven't seen the size for that exact one though. If you have a digital calipers just take it out and measure. (if you don't have get one)


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- This E46 thread talked about radiator hoses O-rings sizes:

https://forum.e46fanatics.com/showthread.php?t=906997


- Another approach is to disconnect the hose, remove the O-ring and measure it yourself. However, over the years, the O-ring probably flattened out, so you may have to round up the thickness a bit to simulated factory size.

Good find! Looks like the other o-ring the OP is after is 16x3.

I bought the full kit from the guy on eBay, but without taking a hose off, I don't know which o-ring goes where. I only knew the 38x4 (which I posted on another forum for him) because I recently changed out those o-rings and measured the new ones so I could replace them in my kit.

AM.

No, the O.P. referred to the large radiator hose.
So according to that E46 link, it us 4x38 mm.

That fits sound about right. I know I took one out to try to find a local replacement but the cs was too fat.


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Sorry, my reply didn't make sense just looking at this forum. I had posted on bimmerfest to answer about the size of the large orings. Thus, he only needed the size for the smaller one.

AM.

Hello guys i'm sorry but I was a business trip, and I did not have time to write. Ok, can I understand that the small o-ring is 16x3 or?