SOHC.co.uk Forums > CB350/400
Dismantling oil filter bolt
Oddjob:
Yeah that makes sense. For some reason I was thinking the filter went on the bolt first but of course it doesn’t.
Athame57:
But what does this spring within the bolt actually do, if there is a pin crossing the circle of the spring? What and how to check?
badger_eng:
Its a bypass / pressure relief. If the filter becomes blocked, it moves allowing free flow of unfiltered oil to continue around the engine
badger_eng:
The spring compression rating will allow it to compress at a certain PSI.
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Oddjob:
The spring sits on the roll pin, it pushes against a small metal cup, with the spring sitting inside the cup. The cup blocks holes in the filter bolt, however if the filter collapses or blocks enough to stop oil flow the pressure of the oil pushes the cup down against the spring pressure and that means the holes it was blocking are now exposed. The oil uses these holes to bypass the filter so stopping the engine from seizing. Get a small sharply bent piece of metal and push down on the cup, it should move, if it doesn’t you have a problem and you’ll need to dismantle the bolt to free it off.
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