Seized vertical intake cam.

Jul 2013
134
3
Tujunga
Very strange failure on my hyper. It's got 58000 miles and I've had it since New. Always changed oil at 4k or less always at proper level. The cam ground and seized in its guide and ended up ripping the belt apart. Somehow it seized in the right spot and didn't bend valves.my question is why might this have happened? It's very odd that only one of the journal locations would starve of oil if it is in fact oil starvation. Any ideas guys? Really want to fix this correctly.
 

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Jan 2019
64
0
Toronto
I'm no engineer or mechanic, but could over-tightened belts have caused this? The damage seems to be near the outboard edge of the journal.
 
Jul 2013
134
3
Tujunga
It was serviced by me about 2000 miles prior. I don't think the belts were too tight. If anything they might have been looser than spec. I'll keep it a thought though. I've done 4 valve adjustments and belt changes and never saw any damage showing up between then. To be honest I let someone rwnt my bike through an app for a day and it took a shit that same day he had it. I don't see what he could of done to cause this though. So not really casting blame on him.
 
Jul 2013
134
3
Tujunga
So I've installed new vertical head, ran it gently for about 10 miles and it seized again. Same cam. Havent opens head yet cause it happen last night. I reckon no oil is being pushed up. Anybody have My reasons or suggestions? I did spin motor by hand with head off and saw no oil come out of cylinder block hole. I figured it wasn't enough rotation to pump any up. Damn.
 
Apr 2013
757
12
uk
Should have spun it up with cam cover off and spark plugs out, just on the starter motor till the oil light went out and so see of oil getting up there.
have you had the oil strainers out to check them. Sounds like the oil galley might have a blockage though.
 
Jul 2013
134
3
Tujunga
I did not check the strainer. I'll do that today. That's the big round cap on bottom right side right
 
Jan 2019
64
0
Toronto
Damn, that sucks. I’m assuming you weren’t running it with the oil pressure light on? In which case you need to figure out why you had oil pressure at the sensor but not at the head.
 
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