mystery o ring in oil sump.

[Guest]

Hi. While cleaning my oil sump and strainer, I found an o ring laying in the pan with some other crud.
Does anybody have an idea what it might be? please see attachment. I left a bolt in the photograph for scale. Many thanks. Mike.

[GregT]

Looks big enough to be a starter motor nose sealing ring.

[Steve]

My first thought was the o-ring on the oil filler cap.

.

[fastbysuzuki]

Think I would side with Greg t on this and go with starter motor oring looks a little heavy for oil filler.

[rapidray]

What engine are you working on? The 16 valve 1100 and 1150 engines have an oring between the oil pan and cases.
Ray.

[bobgroger]

What Ray said. Don't leave it out....
#3 on the diagram

https://www.partzilla.com/catalog/suzuki/motorcycle/1982/gs1100e/oil-pump-oil-filter

[mikebgs]

IMG_4512.jpg
yes sorry for not giving the details. My Bike is a 1978 gs750. The I.D. of the o ring looks to be around 32mm, though that may be a little off because it's in pieces. I think you may be right Steve it looks very similar to the filler cap o ring that is on the cap. I guess the one now on the cap could be a replacement. Greg I'll also take a look at the starter motor nose sealing ring. thank you for the replies. Mike

[mikebgs]

Hi. When re assembling internal components such as the oil sump filter screen, is it advisable to use loctite or is just torqued to spec ok? Thanks again Mike.

[fastbysuzuki]

Personally I put the slightest dap of blue loctite on the screen screws, don't go over the top with it after all you will want to remove them at some point.