View Full Version : Cylinder oil leak HELP please
Red-leader
03-Apr-2006, 09:39
After dropping out the engine and changing the O rings on the rear cylinder head its still leaking oil from that area.
Is there any other reason for the leak please ?
I know they all weep a bit but mine is chucking it out. I thought that the O rings would cure the problem.
Its a 91 900ss.
Help Kev !!!!:flame::flame::flame::flame::flame::flame:
Iconic944ss
03-Apr-2006, 10:16
Is it deffo the head - or are you spotting the oil deposits on the crankcase top?
If thats the case it could be the oil breather instead.
Only other things I can think of from the top of my head (after a nightshift) - is valve cover / head torque not correct / oil feeds ???
Good luck - Frank
[Edited on 3-4-2006 by Iconic944ss]
Red-leader
03-Apr-2006, 10:27
Its the head, the top 6 cooling fins are dry as a bone.
The one on the joint is wet with oil.
Why should it still leak after changing the O rings ?
Operation went without a hitch. All changed over with no drama.
Is there another answer?
Oil breather was changed a month ago.
Help:mad:
Henners
03-Apr-2006, 10:29
Considered a nice VFR ?? :saint:
Iconic944ss
03-Apr-2006, 11:01
Henners...dont be naughty and go directly to the H*nda forum !!!
Kev, I didnt realise the head is only sealed using the 'O' rings - I honestly thought there was a gasket of some sort on top of the barrel.
Looking at the parts pdf it shows TWO DIFFERENT part numbers for the O rings used - could you have used wrong ones or got them mixed.
Otherwise - I'm stumped and can only think of awful things like distorted head or barrel OR perhaps your oil pressure is running too high for some reason...
CALL FOR SUPER-NELLY !!!!!!!!!!!!!
Sorry - Frank
Red-leader
03-Apr-2006, 12:49
There are two different size O rings. One small one and two large.
Or did you mean two different types ?
My SS had an oil leak when the cylinder stud snapped - a common faul with early SS engines.
Strengthened studs are available
Red-leader
03-Apr-2006, 14:30
No problems in that department all studs are at the correct torque. Thats what I cant understand, everything is as it should be !
so all your studs are up to the job ??? Mrs Leader will be happy .... shame about the messy leakage though ..... :P
cheers for the cuppa yesterday ..... :)
Henners
03-Apr-2006, 15:12
Sounds like something's warped Kev ...
Red-leader
03-Apr-2006, 19:20
Not heard of that as a problem on Ducs, and as its only ali wouldnt it torque out.
Still need Help
Kev
Did you make sure the small dowel was still in place ? Did you smear any liquid gasket on the o-rings before assembly? And clean off any old stuff?
Is the compression still good?
Probably of no help as I have never had the head of a belt 900 Duke but it sounds very like the bevel duke in construction , Is it possible one of the O rings has moved , been displaced on re-assembly and has been nipped between the head and barrel ? This happened on my old Darmah and caused a leak very much like the one you describe .
Red-leader
03-Apr-2006, 23:32
Zimbo it all came away clean with no sealant of any kind present, so it just needed a little clean up with brake cleaner and put it back together clean. Is there supposed to be anything on the faces or the O rings ?
Scewy it looks like its coming apart again to make sure, but I dont think the rings would move during assembley as they were a good fit in the recesses.
Anyone done this and had complete success, Am I just un lucky :(
monstermob 998
03-Apr-2006, 23:45
Kev - i take it you did use the green 'silicon' rings? not replace them with black rubber ones? dumb question i know - the green ones withstand higher pressure than the black ones
having just replaced the vertical head on my SS you havent instilled me much confidence :puzzled:but havent had a problem haveing the heads off three times now- i hold the rings in with a smear of grease when placing the head onto the barrell
[Edited on 3-4-2006 by monstermob 998]
Red-leader
04-Apr-2006, 00:01
Yeh they are new ones from Snells. Only cheap, thats what makes it worse.
Have you run yours yet ?
Rattler
04-Apr-2006, 00:08
Take her to Nelly ya tight git!!!
monstermob 998
04-Apr-2006, 00:15
no.havent run it yet....... i havent had time(too much work)plus i keep finding things i want to change such as adding the carb warmers thats been sat on the shelf -adding all stainless bolts- and new clutch plates to get the bike all back together still got to do electrics and exhaust-- but havent had a problem in the past with oil leaks-- got mine from snells and moto rapido --snells only had the small one in stock - they said some geezer with a 900 had the last two big ones!!!!!!!!!:D
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