Posted by Owen Aaland on August 18, 2008 at 22:23:37 from (65.161.86.52):
In Reply to: IH motors posted by Brad Leighton on August 18, 2008 at 14:11:29:
Farm tractors all use the same block for 414, 436, and 466. The blocks for use with turbo chargers have two oil cooling jets per piston while the naturally aspirated engines only have one jet per cylinder. All blocks are drilled for two jets per cylinder so they can be set up either way. Look at the ID tab to see how it was originally built. Turbo engines will have DTT stamped on them along with the engine size while NA engines will only have DT. (ie DTT414 or DT436)
Later blocks have larger diameter lifter bores. Camshafts also were changed to match the larger lifters but the later cam can be used with the old style lifter. Later cams also have different valve clearance settings. there is supposed to be a decal on the valve cover if the later cam is installed in an early engine. Depending upon which style lifter is installed, different push rods are used.
Sleeves and connecting rods are all the same. Pistons have the pin holes located at different lengths from the top of the piston to allow for the different stroke crankshafts. Pistons and rings are different for NA engines when compared to Turbocharged engines. Pressure compensated ring sets also require top mounted breather pipes versus the original style mounted near the camshaft.
Oil pumps have wider rotors on turbo engines. Later NA engines use the original style turbo pump and another still wider rotor pump is used on the later turbo engines.
Cylinder heads for turbo engines have different cooling jets than NA engines. NA heads will have an H cast into them under the intake manifold.
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