SOHC.co.uk Forums > CB500/550
Cb550F continued oil leak. Nature of the beast?
Oddjob:
The problem as I see it in upscaling the thickness of the oring is the head gasket itself, if you make the oring thicker in section and get it wrong it either doesn't seal OR you go too much like 2.6 and that's too much. No problem you think, it will just crush down, which is true but it can only crush down into the space allowed for by the hole in the head gasket, once it reaches the capacity of the hole in the gasket the ring can't go anymore unless it actually starts to split the gasket to make room. Personally I'd say if you increase the section decrease the diameter a little, maybe 2.3 x 1.6 would have been a better choice, just a theory of mine.
If using genuine Honda gasket kit use the orings provided, you need part number 06110-323-000 for a 500, 06110-390-000 I'd imagine for a 550. Head kits always seem to be 06110 then model number, then normally 000, base kits are 06111 IIRC.
Sorry forgot to mention the radical method. Only seen this done once BUT it does work. You get an adapter plug to fit into the blanking plugs that are fitted in the crankcase to seal off the crankshaft oilway. Something like this https://www.ebay.co.uk/itm/175599841260?_trkparms=amclksrc%3DITM%26aid%3D777008%26algo%3DPERSONAL.TOPIC%26ao%3D1%26asc%3D20220705100511%26meid%3Db1593f3ab8b94c05bfa779451747f9e3%26pid%3D101524%26rk%3D1%26rkt%3D1%26itm%3D175599841260%26pmt%3D0%26noa%3D1%26pg%3D2380057%26algv%3DRecentlyViewedItemsV2&_trksid=p2380057.c101524.m146925&_trkparms=pageci%3A1f8ed881-1113-11ee-b766-b2c78a803bab%7Cparentrq%3Ae3c3afb91880ab8f4e980403ffff6196%7Ciid%3A1
You then run a pipe outside the engine up to the blanking plug fitted to the head just under the camshaft end caps, drill and tap that to suit the new pipe and you've now effectively bypassed the entire oilway that's causing you the problems, blank that off and run the oil outside of the engine to the cam. The version I saw used hard lines not something like braided lines, much neater and smaller. Radical but effective.
alexdecker:
--- Quote from: Oddjob on June 22, 2023, 04:34:46 PM ---The problem as I see it in upscaling the thickness of the oring is the head gasket itself, if you make the oring thicker in section and get it wrong it either doesn't seal OR you go too much like 2.6 and that's too much. No problem you think, it will just crush down, which is true but it can only crush down into the space allowed for by the hole in the head gasket, once it reaches the capacity of the hole in the gasket the ring can't go anymore unless it actually starts to split the gasket to make room. Personally I'd say if you increase the section decrease the diameter a little, maybe 2.3 x 1.6 would have been a better choice, just a theory of mine.
If using genuine Honda gasket kit use the orings provided, you need part number 06110-323-000 for a 500, 06110-390-000 I'd imagine for a 550. Head kits always seem to be 06110 then model number, then normally 000, base kits are 06111 IIRC.
Sorry forgot to mention the radical method. Only seen this done once BUT it does work. You get an adapter plug to fit into the blanking plugs that are fitted in the crankcase to seal off the crankshaft oilway. Something like this https://www.ebay.co.uk/itm/175599841260?_trkparms=amclksrc%3DITM%26aid%3D777008%26algo%3DPERSONAL.TOPIC%26ao%3D1%26asc%3D20220705100511%26meid%3Db1593f3ab8b94c05bfa779451747f9e3%26pid%3D101524%26rk%3D1%26rkt%3D1%26itm%3D175599841260%26pmt%3D0%26noa%3D1%26pg%3D2380057%26algv%3DRecentlyViewedItemsV2&_trksid=p2380057.c101524.m146925&_trkparms=pageci%3A1f8ed881-1113-11ee-b766-b2c78a803bab%7Cparentrq%3Ae3c3afb91880ab8f4e980403ffff6196%7Ciid%3A1
You then run a pipe outside the engine up to the blanking plug fitted to the head just under the camshaft end caps, drill and tap that to suit the new pipe and you've now effectively bypassed the entire oilway that's causing you the problems, blank that off and run the oil outside of the engine to the cam. The version I saw used hard lines not something like braided lines, much neater and smaller. Radical but effective.
--- End quote ---
That's is a little too radical for me :) But interesting!
I used Veton 5x2.5, and the manual says to use 5x2.4, so only upsized 0.1. Alas, still a bother. Will try and source a genuine kit. Gotta have something to do come winter :)
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