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: : I have replaced the piston & rings on #4 cyl. of a '39 WC. In the process the cap shims got lost (if there were any). The other rods have shims. I was unable to crank it without shims so have built up to .008" and it seemed ok so closed it up. Now I worry that it may still be too tight. It will turn over reluctantly. : : Can I do damage if I get it running, or will it,loosen up? After all I've spent, from new tires on up, I would hate to lose that crank!!!! : : Thanks : hi don, in response to your question, can i do damage if the rod is not properly shimmed, the answer is yes, definitely
: you need to pick up a set of laminated shims from your allis dealer or they were also available through clevite or another : bearing company. i bought a set for the mains and rods from my local car quest dealer the last time i overhauled one. : if youre not familiar with the shim pack setup, its very confusing.
: you will get what appears to be one shim only to go under each bolt.
: you should start with the complete shim under each side of the rod and plastigage under the brg.torque the cap per operators manual and
: carefully remove the cap and brg. check your clearance with the plastigage and remove shims gradually until you have about two to three : thousands clearance. if youve torqued the brg with no shims under it i recommend that you start with another bearing, since without shims
: it could have been distorted and cause damage to the throw. now unless youve worked with these shims youre gonna think im a liar until you : try it, but you have to take a sharp knife and "peel" a shim or two off the laminated stack at a time and recheck with the plastigage until
: you get the proper oil clearance. the laminated shim appears to be one piece only but trust me, there are several in the stack. its a time : consuming job to go through all the rods and mains to get the proper oil clearance. theres lots of torquing and untorquing. you might want : to check an it manual for the clearance i mentioned since im giving it off the top of my head, but i think the book says 1 1/2 - 3 thousands.
: one and a half is too close for me, so i like the 2-3 thousands range. just take your time and itll work for ya. but remember, if you torqued the
: new bearing shell without shims, you could have made the ends come in contact so hard that it eggshaped them. good luck, grapeape Thanks Grapeape. That was a informative response. There is a small mention of the plastigage and the shim package in the manual but not much. You made it understadable. I have ordered the set through NAPA and should get started on it soon. I ran the engine about 5 minutes and quit because there was a sqeal. I can turn it over with the crank but not easily. Am making a show tractor out of this. Don Foster
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