Babbitts

dubnutty

dubnutty

Member
Can someone explain about babbitts on a 1929 engine for me? I took off the rod caps to move the pistons up in the bore and there seems to be material around the rod studs. As I removed the caps small paper thin material was coming loose. If I reassemble these caps, this tolerance will change without this "shim". Won't it? It kind of just fell out on some of the caps. I posted a picture along with this post. I don't know what to do when I reassemble these rods. I'm just trying to unstick this motor and start it up but it may now need an overhaul.
 

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You need to keep each of the shims in the same location they came from. Also make sure the rod caps stay in the same position they were, and the open end of the dipper scoop must face the cam shaft. Also by the picture the oil looks very dirty, but I'm sure a thorough cleaning was in the works anyway.
 
The shims are used to set the clearance between the rods and the crankshaft. As noted they should go back in the same sequence as when removed otherwise as you note the "tolerance" will change. Since you have it down anyway, check the clearances when you reassemble. Clearance should be close to .0015. Some use Plastigage for measuring, others use the "tinfoil" method. There are numerous posts in the Search section on how to make the installation and adjustment.
 
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