Main bearing wear..
Discussion
Actually I wonder if the other mains are normal wear now..
https://goo.gl/photos/b4YvCufa5QUvf17s9
The next main bearing.
https://goo.gl/photos/b4YvCufa5QUvf17s9
The next main bearing.
Is the polishing on the block side of the shell too? I have seen this on five main bearing blocks when a ring gear was coming loose on the flywheel subjecting the crank to extreme vibrations. I have also seen it when someone tried to reinvent an MGB crank by knife edging it and setting up harmonics that vibrated it to death (main bearing cap cracked) and one could see similar polish marks to yours on both occasions. Maybe dual mass flywheel fault if you have one? Flywheel runout horrendous etc etc
Peter
Peter
PeterBurgess said:
Is the polishing on the block side of the shell too? I have seen this on five main bearing blocks when a ring gear was coming loose on the flywheel subjecting the crank to extreme vibrations. I have also seen it when someone tried to reinvent an MGB crank by knife edging it and setting up harmonics that vibrated it to death (main bearing cap cracked) and one could see similar polish marks to yours on both occasions. Maybe dual mass flywheel fault if you have one? Flywheel runout horrendous etc etc
Peter
I will have to check the block side.. Can't remember.Peter
I was going to Balance the bottom end anyway, so would find out if it was unbalanced..
PeterBurgess said:
Is the polishing on the block side of the shell too? I have seen this on five main bearing blocks when a ring gear was coming loose on the flywheel subjecting the crank to extreme vibrations. I have also seen it when someone tried to reinvent an MGB crank by knife edging it and setting up harmonics that vibrated it to death (main bearing cap cracked) and one could see similar polish marks to yours on both occasions. Maybe dual mass flywheel fault if you have one? Flywheel runout horrendous etc etc
Peter
This is what I was hinting at in my question above. Could the crank have radial play at one end?Peter
Edited by Boosted LS1 on Saturday 11th February 00:24
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