[Japspec]

Hi guys! So, I am currently working on my father's 2017 CRV and doing some general maintenance items. Just got finished with an oil change and brake fluid flush. I then moved onto the rear diff. Luckily, I always learned to first crack open the fill bolt, so that is where I went. However, the sucker is STUCK on there good! What I have tried is a breaker bar, an impact wrench, soaking it in Kroil, but to no avail.
I would try heat with my MAPP gas torch, but I noticed that there is a sealing surface with silicone all around it right near the fill bolt, so I just don't want to end up burning the silicone and creating a leak. Anyone have any tips on what I can try to get the fill bolt off? I also noticed that a 3/8 ratchet head doesn't quite fit all the way in, so is it a different size than what I'm trying to use?

 

[Japspec]

Thanks for the suggestions guys! I guess the dealer may be a good idea here. Although, the other ideas given here are pretty good, and may be worth a shot. The impact I was using was a 1/2 inch electric Ridgid impact, I'll throw a link for it down below. Its crazy, I have been able to remove any other fill bolt I've tried, but this one is something else! And then with the silicone being so close, heat doesn't seem to be an option unfortunately. If I do take it to the dealer this time around, then should I crack the fill bolt off when I get the car back home and do something to make it easier for the next time so I don't have to take it to the dealer again? From my experience, dealers usually torque things down with a few ugga duggas making it difficult next time I try to DIY.

RIDGID 18V OCTANE Brushless Cordless 1/2 in. Impact Wrench (Tool Only) with Belt Clip R86011B - The Home Depot

RIDGID introduces the 18V OCTANE Brushless Cordless 1/2 in. Impact Wrench (Tool-Only) with Belt Clip. OCTANE Tools feature high performance brushless motors and advanced electronics, providing best-in-class

www.homedepot.com

 

[Japspec]

So guys, after procrastinating for a couple months, I finally got around to doing this again. The floor jack idea worked great! Turns out the fill bolt head wasn't really stripping, I just had to hammer the extension in further for it to grab; my mistake. That fill bolt is in a bit of a tight spot for people with big hands.

 

[Japspec]

Thanks guys! Yep wanted to come back and update everyone because I can't even tell you how many times I was searching for a solution to a problem, but the OP never comes back and posts about what works. So anyone who is reading this in the future, try the floor jack method, it worked for me!