Posted by D Slater on January 09, 2009 at 11:00:20 from (71.164.44.66):
In Reply to: Re: MW super MTA parts posted by deerejockey on January 09, 2009 at 09:21:09:
Since I have time sitting here doing nothing on a cold day and you're new to IH heres some info. SM, SMTA and 400 were originaly 4 inch bore with thick sleeves. IH and others sold P&S sets for those engines with thin sleeves and 4-1/8 bore pistons. SM through 450 all used the same block size that sleeves fit in, no block work required unless out of tolerance. SM,SMTA and part of 400 engines used a piston pin dia. of 1.3126 originaly. Later 400 engines used piston pin dia. of .99985 normaly called 1 inch. IH and some others sold pistons with the small pin for use in engines that came with big piston pin and sold adapter bushings to go in original connecting rods to use the pistons. Pistons were also still sold with big piston pin. Later 400 connecting rods were changed on small end to use small pins with a normal thickness bushing. 450 tractors used the small pin and thinwall sleeves for 4-1/8 original bore. If your tractor has the original connecting rods it has adapter bushings in rod. IH never offered a 4-1/4 piston. As posted before check the number on M&W piston again to make sure it 77 instead of 79. If its 77 I don't think block was bored. You have block to look at though.
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