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Posted: Sat Nov 20, 2004 4:34 am
by omegas
wrist pin broke
Posted: Sat Nov 20, 2004 5:26 am
by wistech
QUOTE
Originally posted by MX Quad Dad
After what has happened to our Moto I would say cam wore top of at least one bucket (starting with the gear side of the exhaust cam) mushrooming it out and causing the bucket to seize and hold the valve open.
Just woundering if anybody has an ideal what would fail first if there were short segment of no oil supply to the engine? There is a lot of oil slinging around in the crankcase, and there is a lot of pressure required to open the valves.
The direct wear parts will wear first. Camshaft lobes and cyllinder/piston . The crank/rod/cam bearings has roller/ball bearings and will survive with out oil for a while.
Posted: Sat Nov 20, 2004 7:29 pm
by wistech
OK times up for best guesses. I suspected a broken valve myself.
I just dropped the oil and the filters are all clean with no metal in the oil. That would tend to indicate a hard part break.
A couple hours and the winners will be anounced.
Posted: Sat Nov 20, 2004 9:52 pm
by USAMoto00
Done yet? lol:deal:
And the winners are................
Posted: Sat Nov 20, 2004 11:30 pm
by wistech
Brad77
******
Ironside
:clap:
You 3 were the first to guess correctly
****** hit it on the head. The left exhaust valve broke off at the base and dropped down into the engine.
PM me your addresses and let me know which prizes you would like and I will get them out to you.
I have lots of great info to tell from this motor. Ill post pics of the damage and good news when I get home. And yes there is good news .
Posted: Sat Nov 20, 2004 11:56 pm
by USAMoto00
So only one valve was broke?
Posted: Sun Nov 21, 2004 12:18 am
by Happyboy
Usually when a valve breaks it takes out the piston and liner. Wistech, that the case here?
And why does it have to be only the top 3 correct? I was right, just not quick enough huh?
Posted: Sun Nov 21, 2004 2:21 am
by wistech
Sorry Happy ,I stated the rules in the first post. Just be glad you were correct and jump on my next quiz.
On to the carnage.
The left rear cam lobe had pretty good wear. The head of the valve broke off the stem ,moved over to the intake side and the piston smashed it through the intake valve. Breaking it into 3 big pieces.
Posted: Sun Nov 21, 2004 2:22 am
by wistech
The head dont look so good
Posted: Sun Nov 21, 2004 2:22 am
by USAMoto00
3 valves, 3 pieces! C'mon I said that! lol(close enough)