When I hold my crank in one hand and tap it with a hammer it goes THUD.
Four others I have make a nice RING when tapped.
Is this enough to junk it?
Thanks in advance.
Four that ring and one that goes THUD? That almost sounds backwards based on several posts from the 2 piece crank club.
But yes, the thud noise is not good, That is one quick and dirty test for metallic parts. The ring from the other 4 however does not mean they are good. It just means you can save yourself the expense of crack checking on the one that thuds.
John, I have had some that thud and where good and some that rang like a bell that where cracked, have it magnufluxed to tell for sure, no use looking for a crank if not needed!
I guess I'll spend some money.
I hear this often when people say "It rings like a bell, means it's not cracked." These both rang like a tuning fork. These cracks would of been destructive to entire engine.
We asked this same question in front of our local Model T club and showed them these. Lot's of mouths hit the floor.
It pays to have all parts magnafluxed. your Model T depends on it.
"Rings like a bell" is a fine example of the proliferation of misinformation in this hobby. This "method" of crank diagnosis has been around for a century and it has never the been proper way to value a crank.
If it doesn't ring, it is cracked. If it does ring, it may very well be cracked. Always magnaflux.
My Dad told me of a Guy that drove a Model T all of his life, in to his early 90's, and he still couldn't DRIVE !
Yup, just like it, ones with the least experience, always know the most.
Back in the late '60's my lifetime friend was rebuilding a 312 Y block Ford. He had a crank that "rang like a bell", so he put it in the back of his Dad's IH pickup and headed to the nearest machine shop in Falls City NE., about a 30 minute drive. When he got there, the crank was laying in 2 pieces. That pretty well summed up that myth for us. Dave
Similar factoid - the Liberty Bell was cracked from day one (made long before Independence) and was used anyway, because, well, it "rang like a bell" ! : )
Good one, Rich.