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Discussion Starter · #1 ·
Hey guys I've been working on this for the past 2 weeks and can't find a solution. I recently bought a 2011 STI and I'm doing all the maintenance work to it myself, so I can learn more. I changed engine oil, transmission oil, front diff, and now I'm working on the rear diff. The drain plug for the rear diff won't screw back in. I try to tighten it down and it tightens then gets lose again once I continue tightening. I've tested it without the gasket(crush washer) and I just tried tightening with just the bolt and no gasket(crush washer) and it fully tightens when I just use the bolt, but when I put the gasket(crush washer) on the bolt and try tightening it, the bolt will tighten for a few rotations then loosen up again. Looking for any suggestions on what I should try next.
 

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2020 Subaru WRX STI
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Sounds like you dont have enough thread, the bolt isnt long enough. You could try going to a hardware store and finding a longer bolt, make sure its the same thread and slightly longer.

Initially, was the bolt torqued down and snug with the gasket before you removed it?
 

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Discussion Starter · #3 ·
Sounds like you dont have enough thread, the bolt isnt long enough. You could try going to a hardware store and finding a longer bolt, make sure its the same thread and slightly longer.

Initially, was the bolt torqued down and snug with the gasket before you removed it?
Sounds like you dont have enough thread, the bolt isnt long enough. You could try going to a hardware store and finding a longer bolt, make sure its the same thread and slightly longer.

Initially, was the bolt torqued down and snug with the gasket before you removed it?
I will try finding a longer bolt. The bolt was very tight when I first tried taking it off to drain the old oil. I had to use a breaker bar and the old gasket looked completely destroyed. Maybe a previous person who worked on it over torqued it.
 
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