TRSCobra Posted January 12, 2012 Share Posted January 12, 2012 I cleaned my MAF the other day and the stock o-ring has stretched to the point where it won't stay in the groove when I reinstall it in the MAF housing. I've gone to 5 different parts/hardware stores and can't find any that are the correct thickness to seal properly. The SAE sizes are either too thick or too thin, and I just can't find any metric orings anywhere. Is there a subaru P/N I can't find or a confirmed size/place I can get one? Link to comment Share on other sites More sharing options...
Max Capacity Posted January 12, 2012 Share Posted January 12, 2012 Buy it from your local dealer. Did use use a spray cleaner on the sensor ? 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
joop1987 Posted January 12, 2012 Share Posted January 12, 2012 If you can't find it anywhere, McMaster has any size you want: http://www.mcmaster.com/#o-rings/=fru9iz Link to comment Share on other sites More sharing options...
frank_ster Posted January 12, 2012 Share Posted January 12, 2012 if you dry the o ring off it will shrink back to size Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
Max Capacity Posted January 12, 2012 Share Posted January 12, 2012 if you dry the o ring off it will shrink back to size May be put it in some cold water...us guys know what that can do...LOL Worst case put some non-silicone gasket sealer in the grove and let it tack it a bit then put the sensor back in. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
KCwagon Posted January 12, 2012 Share Posted January 12, 2012 Try putting the o-ring in the freezer for 5 minutes and give it a try. Link to comment Share on other sites More sharing options...
GTTuner Posted January 12, 2012 Share Posted January 12, 2012 I used an A/C o ring that I streched to fit in there. Link to comment Share on other sites More sharing options...
frank_ster Posted January 12, 2012 Share Posted January 12, 2012 May be put it in some cold water...us guys know what that can do...LOL Worst case put some non-silicone gasket sealer in the grove and let it tack it a bit then put the sensor back in. i wrote that .. then deleted that in fears you perfectionists would not approve Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
Max Capacity Posted January 12, 2012 Share Posted January 12, 2012 i wrote that .. then deleted that in fears you perfectionists would not approve Great minds think alike. I'd like to think there are a few of us around here that know how to improvise. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
TRSCobra Posted January 12, 2012 Author Share Posted January 12, 2012 I put it in the freezer overnight and used a light coat of oil, but it still won't work. Link to comment Share on other sites More sharing options...
TRSCobra Posted January 12, 2012 Author Share Posted January 12, 2012 ** Problem solved** Went to a subaru dealer and looked in thier o-ring bin. Found one that works perfectly.(But it cost me $6!) Subaru P/N 806925100 in case anyone has this problem in the future. Link to comment Share on other sites More sharing options...
Mr. Sinister Posted January 13, 2012 Share Posted January 13, 2012 Worst case put some non-silicone gasket sealer in the grove and let it tack it a bit then put the sensor back in. Why non-silicone? On another note, you can also cut the gasket to make it shorter, then use some form-in-place gasket material for a good seal. Works great in a pinch. Link to comment Share on other sites More sharing options...
Max Capacity Posted January 13, 2012 Share Posted January 13, 2012 I was waiting for someone to ask. Silicone is not friendly to O2 sensors. So you don't want to use it in the intake or exhaust system, pre O2 sensors. I have a very smart Audifile buddy, he told me that. I'm sure there must be some info on the web about it. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
GTTuner Posted January 13, 2012 Share Posted January 13, 2012 I was waiting for someone to ask. Silicone is not friendly to O2 sensors. So you don't want to use it in the intake or exhaust system, pre O2 sensors. I have a very smart Audifile buddy, he told me that. I'm sure there must be some info on the web about it. This is 100% true. If you spray down your engine compartment with silicone to shine it up, order a set of oxygen sensors while your at it. If your using any type of form in place gasket make sure it is "oxygen sensor friendly". Link to comment Share on other sites More sharing options...
TRSCobra Posted January 13, 2012 Author Share Posted January 13, 2012 Aren't most gasket makers labeled "sensor safe" nowadays? Link to comment Share on other sites More sharing options...
Mr. Sinister Posted January 13, 2012 Share Posted January 13, 2012 I was waiting for someone to ask. Silicone is not friendly to O2 sensors. So you don't want to use it in the intake or exhaust system, pre O2 sensors. I have a very smart Audifile buddy, he told me that. I'm sure there must be some info on the web about it. Good to know. I would've thought that it'd be fine as long as you let it cure before re-installing it. Link to comment Share on other sites More sharing options...
GTTuner Posted January 13, 2012 Share Posted January 13, 2012 Aren't most gasket makers labeled "sensor safe" nowadays? Yeah, they still make the old stuff. The old permatex blue that smells terrible is still out there. Link to comment Share on other sites More sharing options...
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