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Castaway · 10-21-2007, 02:19 PM

Hope to gain some knowledge about the counterweight assembly below the crankshaft on a Yanmar 4TN84-RJK.
We have a 1997 John Deere 1070 that has spun a rod bearing. After a failed seach for a replacement crank, we found a complete surplus engine with zero hours. Both new and old engines are 4TN84, but the new one has no counterweight assembly, or gear on the crank to drive it if we were to transfer from the old engine.
What differences should we expect?
Should this effect anything besides vibration?

10-21-2007, 02:19 PM	#1 (permalink)
Castaway New Member Join Date: Oct 2007 Posts: 4	Yanmar Crankshaft Hope to gain some knowledge about the counterweight assembly below the crankshaft on a Yanmar 4TN84-RJK. We have a 1997 John Deere 1070 that has spun a rod bearing. After a failed seach for a replacement crank, we found a complete surplus engine with zero hours. Both new and old engines are 4TN84, but the new one has no counterweight assembly, or gear on the crank to drive it if we were to transfer from the old engine. What differences should we expect? Should this effect anything besides vibration?