I have a 3.5 stroke SBC crankshaft from Ray Baker/Baker engineering of ASA fame from motor #1957, it`s marked as follows below, the question is what does the TR .109 and MR .109 mean? thanks in advance.
R std
M std
TR .109
MR .109
SBC crankshaft markings
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Re: SBC crankshaft markings
I'm sort of expecting you will find the rod and main journals are "standard" size, and the radiuses at the edges of the journals are .109" (7/64").
Coming up next -
Wet method fluorescent Magna-flux. We got good results magnetizing cranks like this- single shot AC
http://www.centerdieselmachine.com/imag ... luxing.jpg
Check that the crank is successfully magnetized with something hint like this ( that used to cost 10 bucks for the NAPA version )
https://i.ebayimg.com/images/g/438AAOSw ... s-l400.jpg
Probably a modern inductive multimeter that can to DC AMPS would work OK too.
thorough inspection of crank for:
straightness
Every journal for roundness and cylindricity, right up to the edge radius
snout sizes ( damper, timing sprocket) and runout
flywheel flange, pilot and seal surface runout
Coming up next -
Wet method fluorescent Magna-flux. We got good results magnetizing cranks like this- single shot AC
http://www.centerdieselmachine.com/imag ... luxing.jpg
Check that the crank is successfully magnetized with something hint like this ( that used to cost 10 bucks for the NAPA version )
https://i.ebayimg.com/images/g/438AAOSw ... s-l400.jpg
Probably a modern inductive multimeter that can to DC AMPS would work OK too.
thorough inspection of crank for:
straightness
Every journal for roundness and cylindricity, right up to the edge radius
snout sizes ( damper, timing sprocket) and runout
flywheel flange, pilot and seal surface runout