missing washer on oil filter

[4redjf]

Finally getting back to my bike. Figured i would change the oil and filter. All went well till i started thinking about the oil level in the sight glass. which after running the motor and driving it a mile or so, still no oil showing in the glass. i did put 114 oz in, spilled my measuring cup , is why i didnt get 118oz. It has been on the center stand for overnight and still nothing showing in glass. SO....
Once i was reading about it, i realized that that there was no washer to be found between the oil filter and the spring. I used the k&n filter and put it back together just as it was previously.
So, heres my questions:
What is the size of the missing washer? and how will i know how much oil to put back in after i drop the oil filter to install the washer after i find one?
I will use a clean pan to capture the new oil but residue left in the pan and i was already 4 oz short.
I'm guessing that the washer was stuck to the old filter or i didn't have one, ever. I got the bike one year ago, changed the oil then but dont recall knowing if the washer as there then.

updated: Apparently the PO didn't have the washer on last year and i never checked when i changed the oil.
Washer p/n is 92022-1012 size is 20.5x30x1mm
So, now i must figure out where to get one. I'm assuming they are steel washers.

any input on this is appreciated. Thanks, Jeff

[SgtSlag]

Yes, they are steel, if you are discussing the internal washer (there is a crush copper washer, I believe, on the outside of the oil pan, on the filter bolt). Its purpose is to protect the rubber O-ring, in the center of the filter, so that it is not punctured by the spring between it, and the external filter cover. I believe the spring provides the bypass function, for when the filter becomes blocked, and needs to be bypassed.

Other than that... Many Voyagers run for years without that washer, as it is very easy to miss transferring it. The chances of your oil filter becoming blocked, are extremely low, if you change both oil and filter, every 3,000-5,000 miles (full synthetic oil can go 5,000 miles). The spring will bite into the rubber, possibly limiting the bypass of a blocked oil filter. Ma' Kawi won't spend a penny on a useless washer -- they must have believed it worth the cost to include it in the oil pan, so it is a good idea to have it in there. Any washer of the correct size, and roughly the same thickness, will work. Cheers!

[4redjf]

Yes, they are steel, if you are discussing the internal washer (there is a crush copper washer, I believe, on the outside of the oil pan, on the filter bolt). Its purpose is to protect the rubber O-ring, in the center of the filter, so that it is not punctured by the spring between it, and the external filter cover. I believe the spring provides the bypass function, for when the filter becomes blocked, and needs to be bypassed.

Other than that... Many Voyagers run for years without that washer, as it is very easy to miss transferring it. The chances of your oil filter becoming blocked, are extremely low, if you change both oil and filter, every 3,000-5,000 miles (full synthetic oil can go 5,000 miles). The spring will bite into the rubber, possibly limiting the bypass of a blocked oil filter. Ma' Kawi won't spend a penny on a useless washer -- they must have believed it worth the cost to include it in the oil pan, so it is a good idea to have it in there. Any washer of the correct size, and roughly the same thickness, will work. Cheers!

Thanks for the comments. I haven't rode this bike much since i got it last year due to many things at home. But I changed the oil last year and other fluids after i bought it and didn't remember if the washer was there or not. Changed the oil, and rode it maybe 1k miles for the year.
Well, i went and got more oil and put it back together and should have 118oz of oil in it now, and without the washer.
I've bought the washer off ebay today too. Just to have for the next time i change the oil, which is next year now. I always do change the filter with the oil, and i'm using the blue jug, rotella 15w40 Synthetic. I used it in my Goldwing 1800 for years and seemed to work fine with regular oil/filter changes. Oh, by the way, the "piggyback" oil drain plug i put in last year, due to stripped threads, worked great. So if anyone encounters a similar issue, then just look in to the piggyback drain plug. The plug is slightly oversize and cuts treads and then to drain it, just hold the larger bolt and unscrew the inside smaller one out for draining. Worked like a charm this time.
Well, Thanks again for the comments. Hoping to get some riding in later on in april.