Bi-Pass oil filter part

[HCO41]

In the diagrams for these filters, as shown in the 49-53 parts book, there is a part that I don't have in either of my filters. It appears to fit into the bottom of the top spring, possibly to prevent chaffing of the rubber gasket on top of the filter. Is this part necessary?
When disassembling the filters for cleaning and painting neither had this washer (?). Is this part available or does anyone have a couple I could buy or can anyone give me the dimensions and how it's fitted to the spring so I can make them? Thanks,
Howard

[scooder]

It's ment to be there, the washer type thing on the spring. It's not for chaffing protection, it seals the inside from the outside of the filter.
Martin.

[HCO41]

Thanks scooter, is it made from rubber or other sealing material? I thought the interference fit of the rubber seal at the top of the filter forced the filtered oil into the center post and out the bottom to return to the crankcase.
I'll put a "wanted" in the swap meet but if someone could give me the dimensions of the "washer" I could probably make it. Thanks,
Howard

[scooder]

I'll have a measure today and tell you what I find.
Martin.

[51 MERC-CT]

Originally Posted by HCO41

Thanks scooter, is it made from rubber or other sealing material? I thought the interference fit of the rubber seal at the top of the filter forced the filtered oil into the center post and out the bottom to return to the crankcase.
I'll put a "wanted" in the swap meet but if someone could give me the dimensions of the "washer" I could probably make it. Thanks,
Howard

It is nothing more than a flat washer ( 1.25" OD x .600" ID x .025" thick ) with a rolled ID that holds it in place on the spring.
It is a footing for the spring and does not seal anything. Any sealing is done internally as part of the filter.
Go to the hardware store and get a 7/16" flat washer with a 1.25" OD and bore the ID out to
.600-.630.
Slip the washer over the center tube just before installing the cover and you're good to go.

[scooder]

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There's the sizes, I think that the washer does help seal the insides from the outside of the filter element. By pressing down nice and even on the top of the sealing rubber. Some of the filter elements have the sealing rubber as a separate part, not stuck on the filter ends. Sure the actual seal is performed by the rubber, but the metal of the ends of the element and the back up steel washers (the one we're talking about) locate the seal and hold its position to do its job properly.
Sealing rubbers rely on hard parts to work, without the hard parts, the rubber is easily pushed out of place and no longer seals.
Martin.

[HCO41]

Thanks scooter and 51Merc. I'm sure I have a washer that'll do the job. Simple part but hard to size up when I've never seen one. Thanks again,
Howard