I think your comments are right on. Yes I do believe the actual pressure plate was reground just one to many times.
Here is what I think happened. My first error of not tying the bearing fork back when I hand cranked the motor probably cracked the thin pressure plate where the fork attaches. In the picture below you can see how thin the surface had become. Even though I repaired the arm the damage was done. Like the Titanic it was doomed. Once I revved the engine the fork let go and the bell housing turned into a blender with the remaining forks and springs as chum.
I did contact the builder and he contacted the people that did the repair. They might have a replacement. We'll see.?
I also have an old Interchangeable parts book [Chilton] from the early 30's. I could not find any markings but Chilton shows it as EJ10 13 in it's interchange book.
Chrysler Part number: 42233
I believe this pressure plate (EJ10 - 13) was used on :
1927 Whippet 93A Rockford Clutch
1928-29 Whippet 98
1930-31 Whippet 98A
1928 Willys-Knight 56
1928-29 Willys-Knight 70A
1929 Willys-Knight 56
1929-30 Willys-Knight 70B
1929-30 Marmon Roosevelt
1931-32 Marmon 70
I do think you are right.., it might be a blessing in disguise. If that plate would have come apart while declutching with the transmission in place and motoring down the road.., I would have suffered more than just a scary noise. To my surprise the plate didn't fall apart until I unscrewed the pressure plate housing. So just the small parts were bouncing around.
I will try your recommendation. Even if the rebuilder comes up with another plate it's always good to have some spare parts. After all if you have a spare the original part will never fail. [ Murphy's Law ]
Cheers Chet...
Here is what I think happened. My first error of not tying the bearing fork back when I hand cranked the motor probably cracked the thin pressure plate where the fork attaches. In the picture below you can see how thin the surface had become. Even though I repaired the arm the damage was done. Like the Titanic it was doomed. Once I revved the engine the fork let go and the bell housing turned into a blender with the remaining forks and springs as chum.
I did contact the builder and he contacted the people that did the repair. They might have a replacement. We'll see.?
I also have an old Interchangeable parts book [Chilton] from the early 30's. I could not find any markings but Chilton shows it as EJ10 13 in it's interchange book.
Chrysler Part number: 42233
I believe this pressure plate (EJ10 - 13) was used on :
1927 Whippet 93A Rockford Clutch
1928-29 Whippet 98
1930-31 Whippet 98A
1928 Willys-Knight 56
1928-29 Willys-Knight 70A
1929 Willys-Knight 56
1929-30 Willys-Knight 70B
1929-30 Marmon Roosevelt
1931-32 Marmon 70
I do think you are right.., it might be a blessing in disguise. If that plate would have come apart while declutching with the transmission in place and motoring down the road.., I would have suffered more than just a scary noise. To my surprise the plate didn't fall apart until I unscrewed the pressure plate housing. So just the small parts were bouncing around.
I will try your recommendation. Even if the rebuilder comes up with another plate it's always good to have some spare parts. After all if you have a spare the original part will never fail. [ Murphy's Law ]
Cheers Chet...