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Dismantling oil filter bolt

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Oddjob:
There is evidence of some aftermarket oil filter bolts being assembled wrong. I've done a few of the bolts now, it's fairly easy. However getting the insides to slide easily down the tube can take a little doing. I can't remember exactly now how they are supposed to be assembled but lets say it's plug, spring. Some of David Silvers bolts were spring, plug. Meaning they wouldn't work as they were meant to. In fact they wouldn't not work at all. Or they'd be permanently reducing the oil pressure by opening areas not meant to be opened except when the filter blocks. I've also found pressure relief valves on the oil pump itself jammed solid. 3 out of 4 were stuck in place.

It's where I find the little plastic wheels I use on my Dremel come into their own. You can use a really fine grade of wheel to essentially polish the components to allow them to move very freely when needed. Very easy to do with no effort at all.

badger_eng:
Mine was the original Honda type Oddjob. Knowing me, I would have photographed it as I went along (kiss of death that statement eh)
If needed, I can trawl the archives and send on to whoever needs.

Just let me know if required and I’ll check on the comp 👍

Oddjob:
Just found my stash. I have 3 disassembled. Just a cup like plug and a strong spring along with the roll pin. I must have left them dissembled in order to zinc plate the bolt but my illness last year put paid to that. I did however find an oil filter washer in the same box, that made me look around and find an exact copy in stainless steel so I ordered 50. I'm doing a 1976 Kawasaki Z100A1 at the moment for my brother in law, I found that just like Honda they also used the same type of washer to prevent the spring under the filter from going through the rubber grommet in the filter and of course his was missing. I had to make one out of a gearbox thrust washer as they were no longer available even from specialists like Zpower. I think it's spring in first, followed by plug. Then held in place by roll pin. That would mean the plug would be exposed by the filter spring and thus able to be forced back against the oil pressure and so allow openings in the filter bolt being exposed and allowing oil to bypass the filter in the event of a blockage.

Athame57:

--- Quote from: Oddjob on August 26, 2026, 12:39:41 PM ---Some of David Silvers bolts were spring, plug. Meaning they wouldn't work as they were meant to. In fact they wouldn't not work at all. Or they'd be permanently reducing the oil pressure by opening areas not meant to be opened except when the filter blocks.

--- End quote ---

Eeek! Mine is a DSS one too.  :o  I entered this thread thinking of something else, I've never thought to take a closer look at the bolt but I will now. If it is in right, ok but how to test? I'd rather not be pulling apart, knowing me at best I'll need my big magnet to hunt missing pin, or at worst I'll end up with an eye patch like Long John silver, never mind David Silver.  ;D
I think I'd rather take  a leaf out of John Webley's book.

badger_eng:
The schematic is correct

The cap is nearest the hex on the bolt, followed by the spring. Both then held in place by the roll pin.

No stress…. easy peasy job to do.

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