- Dec 28, 2008
That's a sure sign of a loose valve guideBad news!!! Less than 100 miles and looks like a cracked guide or guide hole!!! Wet oil in exhaust track and you can see the green oil all around the guide!! Thanks all ...time to make a phone call
Mine had cracks around the exhaust guides and oil leaking into the exhaust port, the bike didn't smoke and no oil on the plugs just oil from the exhaust flange that was 2 weeks after being back on the road from the rebuild back in the early 80s.And no exhaust smoking?
Mine had cracks around the exhaust guides and oil leaking into the exhaust port, the bike didn't smoke and no oil on the plugs just oil from the exhaust flange that was 2 weeks after being back on the road from the rebuild back in the early 80s
The oil didn't piss out it was more just a slight leak from both cracks and took its time to show from the exhaust flanges but after two weeks it started to pool at the flanges, at first thought its was a blown head gasket but after cleaning and following the leak it was from the exhaust ports then removing the exhaust and headers and a close inspection I could see the oil and small cracks, the way the oil traveled through the valve it didn't pool in the area or near the spark plug and reason no smoke or oil on plugs, who knows, maybe riding it longer it might have but the head came off and sent to another head rebuilder who knew his stuff after showing the damage to the original rebuilder and he admitted he stuffed up and he told me it was his first Norton head.I still don't understand how oil leaking into the exhaust port wouldn't produce visible smoking from the silencers, but you and the OP have both provided "testimony" supporting this. I also don't understand why the OP's leak, expressed on the exhaust nut, didn't start a fire.
Years ago I made arrangements to have Leo Goff freshen up a Mk3 head. I told him that I had the Norton valve guide tool and that I would save him some time and punch out the guides. Absolutely not he said, we machine them out and measure/machine the new guides for the factory specified fit, for each hole.
Thanks for the correction to you and the OP.
I'm wondering why he wants you to run it for another couple of weeks? If it's a loose guide it'll make matters worseWell I talked to the builder...he said that he would like me to run the bike for a couple more weeks and periodically check the exhaust port. He said that they would correct any issues if it was done by them. He went on to tell me that some of those heads are very pourus and maybe when pressing in the guide it aggravated a possible anomaly? They did heat the head when putting in the guides...his Machinist is local to him and specializes in Brit bikes.
I’m not going to name because I respect the business and “NOT “saying any negative remarks since they have been honest and helpful.
I’m going to run it and see what happens.
and yes....seriously no smoke on start up? Plugs are clean and pipes has grayish exhaust soot in it.