Posted by Janicholson on September 14, 2008 at 16:49:29 from (66.173.50.130):
In Reply to: SMTA Lift-All posted by GordoSD on September 14, 2008 at 15:22:42:
As D Slater points out, that tactic is going to ruin parts in the hydraulic system. The vibration must be coming from other sources, as the drive for the live pump, and the internals of it are pretty much shafts, and are not reciprocating. There could be many things unbalanced in the moving parts. If the vibration is present even when the clutch is in, and the drive train is stopped, then from the fly wheel to the front pulley is the primary place to look. A improperly milled flywheel A flywheel with a chip of metal under it on the crank flange A cylinder that is low on compression causing power imbalance. (possible valve adjustment issue) A flat cam lobe (not usual on IH stuff) Any of the four pistons that are not identical to the others (weight or style) One wrong length rod A front pulley with massive runout (unlikely) Those are about it. If it is operated by a seasoned IH driver, and s/he thinks it is normal, it probably is.
All of that series has no balance weights on the crank, they depend on the rods and pistons moving in opposite directions(one and four moving up, 2 and 3 moving down), and the firing order to make it operationally balanced. The pistons and rods must be all the same weight and type. They can be any weight, from cast iron to forged, but they must be the same. Good luck, JimN
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