turboguzzi Posted August 2, 2017 Share Posted August 2, 2017 decided to follow a member's advice and change the A/C o-rings before a recharge got a neat 270 kit to choose from, and still, could be cool if someone actually knew what are the sizes, so it's not a trial and error thing and yes, did some googling, but the one thread were i saw o-ring dimensions they were definitely not for my model (1995 Leg SW MT5) the three different sizes P/N are: 73039AA060 73039AA080 73039AA090 thanks i advance! TG Quote Link to comment Share on other sites More sharing options...
AdventureSubaru Posted August 2, 2017 Share Posted August 2, 2017 I just bought the standard mixed bag of rings from Oreillys. There was more than enough there. Easy to compare them as you go. Pull the old one, find it's match in the bag and swap. 1 Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted August 3, 2017 Share Posted August 3, 2017 yeah, I just eyeballed it, 1.8 or 2mm thick i think. Some size that required the minimal amount of stretching without being 'saggy' . so far so good. try to get some oil on your little finger to wipe on the new ring and gently wiggle/twist as you insert the hose adapter. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted August 3, 2017 Share Posted August 3, 2017 The exact size is irrelevant. You go by fit. You want a snug POP when it goes into place. Without cutting into the o-ring and without being too loose. GD Quote Link to comment Share on other sites More sharing options...
turboguzzi Posted August 3, 2017 Author Share Posted August 3, 2017 was asking because the old ones are totally set into a deformed triangle/round/square section, you know what i am talking about .... thought there was a chance that someone happened to have measured OEM ones before fitting will go with feel/fit/eyebal like always, was just trying to be more scientific tnxs in any case Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted August 3, 2017 Share Posted August 3, 2017 there may be part numbers or dimensions in this thread;http://www.subaruoutback.org/forums/99-do-yourself-illustrated-guides/43428-diy-c-air-conditioning-leak-refrigerant-repair-5-less-15-minutes-less.html Quote Link to comment Share on other sites More sharing options...
turboguzzi Posted August 3, 2017 Author Share Posted August 3, 2017 actually it was in that forum that i found also a list, but none of the dimensions worked on my system, they were all pointing at 2.4 mm rings, mine were much thinner. must be for other models. found them here: http://www.subaruoutback.org/forums/110-gen-2-2000-2004/44938-c-air-conditioning-oring-o-ring-sizes-log-only-no-replies.html problem solved for the time being by "feel", car filled this morning and cools great, lets see how they hold and if any one does have the OEM dimensions, he is welcome to post 1 Quote Link to comment Share on other sites More sharing options...
forester2002s Posted August 3, 2017 Share Posted August 3, 2017 Here are some measurements that I made on the old rings that I recently replaced (I tend to hoard old parts, just in case...): - These are for a 2002 Forester - Subaru O-ring #73039TA020 cross-section dia. 2.2mm; ID 11.0mm - Subaru O-ring #73039TA040 cross-section dia. 2.2mm; ID 16.8mm These are probably accurate to about +/- 0.1mm. A used a digital-caliper, but it's not easy getting a stable reading on the soft rubber O-rings. Quote Link to comment Share on other sites More sharing options...
turboguzzi Posted August 3, 2017 Author Share Posted August 3, 2017 good! thanks for that! this are more like the sizes i fitted discovered this page that shows that same oring has several numbers http://parts.subaru.com/a/Subaru__Legacy/_54104_6021151/AIR-CONDITIONER-SYSTEM/B11-730-01.html my kit has same diamters but 2mm , so all good , the 2.4mm were too big Quote Link to comment Share on other sites More sharing options...
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