1. I have a TO-20, and I have had the same problem trying to locate the correct oil filter.
The WIX 51107 should be the correct oil filter for the TO-20, but my local auto parts store doesn't have the 51107 in the WIX book any more. (I believe the 1107 is the NAPA version, but it's made by WIX.)
Instead, they list the WIX 51010 for BOTH the TO-20 AND the TO-30, which, as you noted in the manual, should not be correct: the TO-20 requires an "inside-to-outside" filter, and the TO-30 is "outside-to-inside".
As far as I can tell, none of the filters that cross-reference to the WIX 51107, the "correct" oil filter for the TO-20, is made any more.
Here's an excerpt from an e-mail message I received from a VERY popular online seller of parts for vintage tractors, regarding the "oil flow" issue:
Upon further research, of the few major manufacturers of filters, it
has come to light that the filters are now being made that direction
of the flow is indifferent.
Verified with Tisco (they have been selling parts for 75 years) they
now supply these for both as the same filter. Technology has made a difference in 60 years.
You can take that for what it's worth.
Many sellers are listing the Baldwin P40 as the correct filter for the TO-20.
I have both the Baldwin P40 and the WIX 51010, and while the overall dimensions are the same, the ends of the two filters are completely different: the WIX is solid metal, and the Baldwin has a raised rubber washer, that looks like it would seal better than the WIX.
I can't help with questions 2 and 3, because, quite honestly, I haven't changed my oil and filter yet, because I was afraid I'd run into precisely the kind of problem you described! :cry:
Regarding the screen, canister, etc., you might want to check the archives, as this has been discussed previously. Jason and John (UK), among others, have lots of experience.
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