Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: Ashdowner on March 02, 2017, 03:28:36 PM

Title: What's my oil filter bolt got inside it?
Post by: Ashdowner on March 02, 2017, 03:28:36 PM: Can't really see it very well here but the second hole from the right of the oil filter bolt is blocked by a piece of cylindrical metal (brass?) which has a spring below it (to the open end of the bolt) and this is held in place by a pin (small hole 2nd picture) going through the bolt. My question is what the hell is it? Also the holes in the bolt have all got bits of metal scarf as if the hole doesn't seem to have been finished of properly. Anyone else got the same?.
Title: Re: What's my oil filter bolt got inside it?
Post by: hairygit on March 02, 2017, 03:57:50 PM: Oil filter pressure relief/bypass valve. If the oil filter becomes badly clogged, the pressure forces oil through the valve to provide unfiltered oil to the crank etc to avoid totally destroying the engine.
Title: Re: What's my oil filter bolt got inside it?
Post by: Ashdowner on March 03, 2017, 11:25:15 AM: Thanks hairygit. My oil change discipline is pretty good so I hope it never comes to that.
Title: Re: What's my oil filter bolt got inside it?
Post by: Bryanj on March 03, 2017, 07:03:26 PM: The technical term for the internals is "Gubbins"
Title: Re: What's my oil filter bolt got inside it?
Post by: steff750 on March 03, 2017, 07:32:33 PM: Quote
Oil filter pressure relief/bypass valve. If the oil filter becomes badly clogged, the pressure forces oil through the valve to provide unfiltered oil to the crank etc to avoid totally destroying the engine.
yes and the unfiltered oil tends to take bits of crap that has been sitting there with it through the bypass valve ,so you might still have a engine that is toast?
Title: Re: What's my oil filter bolt got inside it?
Post by: hairygit on March 03, 2017, 07:43:42 PM: Quote from: steff750 on March 03, 2017, 07:32:33 PM
Quote
Oil filter pressure relief/bypass valve. If the oil filter becomes badly clogged, the pressure forces oil through the valve to provide unfiltered oil to the crank etc to avoid totally destroying the engine.
yes and the unfiltered oil tends to take bits of crap that has been sitting there with it through the bypass valve ,so you might still have a engine that is toast?
Indeed that may happen and the shells get knackered, but easier to fix than a seizure with shells spinning in the cases!
Title: Re: What's my oil filter bolt got inside it?
Post by: mike the bike on March 03, 2017, 11:19:53 PM: I thought they couldn't do that because of the cut outs / flat bit / whatever the proper name is.
Title: Re: What's my oil filter bolt got inside it?
Post by: martin_uk on March 04, 2017, 09:44:24 AM: Quote from: mike the bike on March 03, 2017, 11:19:53 PM
I thought they couldn't do that because of the cut outs / flat bit / whatever the proper name is.

The tabs are just to accurately locate.

The shells are a "nip fit" in case/con rod, but if sufficient force applied due to seizure between bearing surface and crank journal, will rotate.
Title: Re: What's my oil filter bolt got inside it?
Post by: hairygit on March 04, 2017, 12:26:00 PM: And if they do spin, there's a chance they'll knacker the crankcases!
Title: Re: What's my oil filter bolt got inside it?
Post by: Bryanj on March 04, 2017, 08:45:09 PM: Thats not a chance its a certanty
Title: Re: What's my oil filter bolt got inside it?
Post by: Ashdowner on March 05, 2017, 07:44:38 AM: Wish I hadn't asked. I can't sleep at might now for worrying. Think I'll change my oil once a day.
Title: Re: What's my oil filter bolt got inside it?
Post by: Ashdowner on March 05, 2017, 06:29:57 PM: Well my pressure relief valve wouldn't have worked at all because the holes in the bolt had scarf attached to them which had locked the piston solid - and it wasn't crap that had got there, it was crap that I had to physically part from the bolt itself because it had been left there from the manufactiure.