Originally Posted by wgoodbye
Try a flat tip screwdriver or drift punch and place against one of the indentions of the retaining ring and tap gently in the correct direction. That should be enough to get it started.
This is what I have always done, then on re-installation, just a little silicone grease on the threads, and it does not have to be stupid tight, just snug. Only reason I use silicone is it's clean and won't stain, any grease would do.
The wrench looks like a half circle with a nub on the top of the circle, it hooks into one of the indention's, it's not like a water
filter wrench that grabs all of the indention's.
Least the wrench I had was like this, I have also used a pipe wrench with a piece of leather, the pipe wrench will apply lots of force and the leather won't mar the ring, but it does not need to be that tight that it takes excessive force to remove, just like a spin on oil filter
, if you can get to them, if installed correctly you should be able to remove by hand. I have had to drive a screwdriver through one every now and again people have cranked them down so tight.