finally had a failure---guesses
Haven't looked at the exhaust valves yet. Still gotta pull the exhaust off. But, before i walked out the door this morning i pulled the clutch cover off. Timing chain is not broken but it is all the way loose. That explains why the piston is still going up and down but the intake valves are not moving. So, probobly a broken chain guide. I didn't look much in there to see what was broken, had to get to work. ug...driving in the rain for an hour to work...yay.
QUOTE (Happyboy @ Oct 13 2009, 08:59 AM) <{POST_SNAPBACK}>
Haven't looked at the exhaust valves yet. Still gotta pull the exhaust off. But, before i walked out the door this morning i pulled the clutch cover off. Timing chain is not broken but it is all the way loose. That explains why the piston is still going up and down but the intake valves are not moving. So, probobly a broken chain guide. I didn't look much in there to see what was broken, had to get to work. ug...driving in the rain for an hour to work...yay.
How would the chain being loose not open the valves? UNLESS the chain came off the sprocket. But that could have ugly results. I would not crank the motor over any more until you know for sure.
QUOTE (Happyboy @ Oct 13 2009, 08:31 AM) <{POST_SNAPBACK}>
its off the lower sprocket. just hanging there loose.
Easy Fix,put it back on and go. LOL
I am going to get home and hopefully yank it out of the frame tonight. Should be interesting taking those covers off. I'm sure I'll be peaking hoping for the best as I open her up. If the chain did just come off I hope the valves got lucky and cleared the piston. And if they didn't they just didnt' hurt the head too badly.
Well, looks like i might have a very lucky failure. Looks like a broken timing chain guide. woot 
It appears the guide broke and the chain flew off and landed between the gears up top allowing enough slack below that the crank gear didn't grab it. Wow, i could see that failure being nasty.
Both sets of valve open and close easily, but i still might have tweaked valves, won't know until i pull the head off. Besides a little rubbing on the oil bridge there is virtually no damage on the tranny side. I'll be pulling and inspecting everythign tomorrow when i tear is down the rest of the way. When looking at the cams they look great, but it appears the exhaust cam bearing is going. Luck or was it affected by the timing chain mishap? Hrmmm...we'll see when i pull it apart the rest of the way. Cam Caps look good.
[attachment=9155:DCAM0046.JPG]
[attachment=9156:DCAM0045.JPG]
[attachment=9157:DCAM0049.JPG]
It appears the guide broke and the chain flew off and landed between the gears up top allowing enough slack below that the crank gear didn't grab it. Wow, i could see that failure being nasty. Both sets of valve open and close easily, but i still might have tweaked valves, won't know until i pull the head off. Besides a little rubbing on the oil bridge there is virtually no damage on the tranny side. I'll be pulling and inspecting everythign tomorrow when i tear is down the rest of the way. When looking at the cams they look great, but it appears the exhaust cam bearing is going. Luck or was it affected by the timing chain mishap? Hrmmm...we'll see when i pull it apart the rest of the way. Cam Caps look good.
[attachment=9155:DCAM0046.JPG]
[attachment=9156:DCAM0045.JPG]
[attachment=9157:DCAM0049.JPG]
QUOTE (Happyboy @ Oct 13 2009, 07:32 PM) <{POST_SNAPBACK}>
Well, looks like i might have a very lucky failure. Looks like a broken timing chain guide. woot It appears the guide broke and the chain flew off and landed between the gears up top allowing enough slack below that the crank gear didn't grab it. Wow, i could see that failure being nasty.
Both sets of valve open and close easily, but i still might have tweaked valves, won't know until i pull the head off. Besides a little rubbing on the oil bridge there is virtually no damage on the tranny side. I'll be pulling and inspecting everythign tomorrow when i tear is down the rest of the way. When looking at the cams they look great, but it appears the exhaust cam bearing is going. Luck or was it affected by the timing chain mishap? Hrmmm...we'll see when i pull it apart the rest of the way. Cam Caps look good.
[attachment=9155:DCAM0046.JPG]
[attachment=9156:DCAM0045.JPG]
[attachment=9157:DCAM0049.JPG]
It appears the guide broke and the chain flew off and landed between the gears up top allowing enough slack below that the crank gear didn't grab it. Wow, i could see that failure being nasty. Both sets of valve open and close easily, but i still might have tweaked valves, won't know until i pull the head off. Besides a little rubbing on the oil bridge there is virtually no damage on the tranny side. I'll be pulling and inspecting everythign tomorrow when i tear is down the rest of the way. When looking at the cams they look great, but it appears the exhaust cam bearing is going. Luck or was it affected by the timing chain mishap? Hrmmm...we'll see when i pull it apart the rest of the way. Cam Caps look good.
[attachment=9155:DCAM0046.JPG]
[attachment=9156:DCAM0045.JPG]
[attachment=9157:DCAM0049.JPG]
It's nice to see that occasionally there is someone that doesn't have a catastrophic failure.
