M8 problems
#901
Not sure I need that kind of fame though...
But THANKS anyway.
So, with all that talk and no pictures: I went to the shop, looked at the bike and here we go - PICTURES!!
Not much to see, except some deposits on the front piston. Some discoloration on front cylinder, but no visible surface damage (I might be blind though...).
No other parts as far as I could see have discoloration or damage. Tech said he talked to MoCo and after a few min they agreed to send new engine.
I hope that helps.
Thank you.
FrankEGD
But THANKS anyway.
So, with all that talk and no pictures: I went to the shop, looked at the bike and here we go - PICTURES!!
Not much to see, except some deposits on the front piston. Some discoloration on front cylinder, but no visible surface damage (I might be blind though...).
No other parts as far as I could see have discoloration or damage. Tech said he talked to MoCo and after a few min they agreed to send new engine.
I hope that helps.
Thank you.
FrankEGD
#902
Yep, pretty much the same as mine. No wall scoring or piston damage but when they rotated the crank assembly there was significant increased resistance. Clearing the bearings had been damaged from the excess heat. Once they find excessive resistance in the crank assembly they simply authorize a replacement engine. Probably less costly than rebuilding the existing engine.
Not sure I believe that he bearings were damaged by excessive heat.. They should last as long as the temps stay below 200 C. The only way could be that the oil was breaking down or simply too much oil flooding the bearing since the crank is literally swimming in oil.. When sumping, the oil aerates. Maybe air in the oil pushed the pump causes the oil to oxidize and kills the lubrication properties. I would think at that point lifter would start to rattle.
What did the motor oil look like? If not to dark, I'd suspect too much oil flooding the rollers.
#903
Not sure I believe that he bearings were damaged by excessive heat.. They should last as long as the temps stay below 200 C. The only way could be that the oil was breaking down or simply too much oil flooding the bearing since the crank is literally swimming in oil.. When sumping, the oil aerates. Maybe air in the oil pushed the pump causes the oil to oxidize and kills the lubrication properties. I would think at that point lifter would start to rattle.
What did the motor oil look like? If not to dark, I'd suspect too much oil flooding the rollers.
What did the motor oil look like? If not to dark, I'd suspect too much oil flooding the rollers.
And BTW, it was dark, in like DARK!
FrankEGD
#904
Not sure I believe that he bearings were damaged by excessive heat.. They should last as long as the temps stay below 200 C. The only way could be that the oil was breaking down or simply too much oil flooding the bearing since the crank is literally swimming in oil.. When sumping, the oil aerates. Maybe air in the oil pushed the pump causes the oil to oxidize and kills the lubrication properties. I would think at that point lifter would start to rattle.
What did the motor oil look like? If not to dark, I'd suspect too much oil flooding the rollers.
What did the motor oil look like? If not to dark, I'd suspect too much oil flooding the rollers.
Last edited by Heatwave; 09-22-2017 at 12:40 PM.
#905
So it sounds like the oil died which probably killed the bearings.. I find it interesting that you didn't notice the loss in power when the motor started to sump.. I would guess that ridding at a constant speed might mask the issue tho.. I've got a big motor TC that had a sumping issue but would notice when the issue occurred, it felt like the rear brake was on or simply going up a steep hill. Motr needed way more throttle to pull and way less to slow down. In my case, letting the motor simply idle would correct the issue.
312 F is only about 156C. Probably more than enough to kill the syn3 or any dino quickly.
312 F is only about 156C. Probably more than enough to kill the syn3 or any dino quickly.
#906
So it sounds like the oil died which probably killed the bearings.. I find it interesting that you didn't notice the loss in power when the motor started to sump.. I would guess that ridding at a constant speed might mask the issue tho.. I've got a big motor TC that had a sumping issue but would notice when the issue occurred, it felt like the rear brake was on or simply going up a steep hill. Motr needed way more throttle to pull and way less to slow down. In my case, letting the motor simply idle would correct the issue.
312 F is only about 156C. Probably more than enough to kill the syn3 or any dino quickly.
312 F is only about 156C. Probably more than enough to kill the syn3 or any dino quickly.
#907
Yep, pretty much the same as mine. No wall scoring or piston damage but when they rotated the crank assembly there was significant increased resistance. Clearing the bearings had been damaged from the excess heat. Once they find excessive resistance in the crank assembly they simply authorize a replacement engine. Probably less costly than rebuilding the existing engine.
#908
It definitely had sumping power loss earlier but not at the time it began to fail which was strange. First engine definitely had significant power loss due to sumping. At first no body would believe me whan i said 50% power loss. But once they issued sb1450 they finally started listening.
Generally when a motor starts sumping seriously something is wrong and it shows up. Early TCs had the random sump issue and HD came out bulletin on how to install/tighten the cam plate and oil pump..
One thing that is interesting is that the cam-plate install procedures for the TC and M8 are different..
#909