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Tractor Talk Discussion Forum

Re: 4 cyl Firing order

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pete 23

11-14-2012 19:54:54

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IH has a great explanation of the imbalance forces in a 4 cyl inline engine. I think it is in the C153 service manual, but not sure. Anyway, they go to great lengths to explain why they added the balancer shaft below crankshaft. It has to do with the fact that a piston moves a different distance in a specific degrees of crankshaft rotation at top dead center than that same piston does at bottom dead center. I have put dial indicators on pistons both top and bottom dead centers and turned crank same amount in degrees and you get a different reading. Try it sometime. Interesting.

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John B.

11-15-2012 06:59:09

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 Re: 4 cyl Firing order in reply to pete 23, 11-14-2012 19:54:54  
Yes the piston travels a farther distance in the first and last quarter of crank rotation as compared to the second and third quarter of crank rotation. This is due to the side movement of the connecting rod. Picture a ladder leaning against your house. If you pull he bottom of the ladder away from the house the top of the ladder moves down yet the bottom of the ladder is still at ground level. In the first quarter of Crankshaft rotation it's pulling the piston down plus moving the bottom end of the rod away (from the house sort of speak) so there are two elements causing the piston to come down. In the second quarter of crankshaft rotation the crank is still pulling the piston downward but it's moving the rod (closer to the house) decreasing overall downward piston travel. Third quarter of crank rotation it's pushing the piston up but pulling the rod away from the house again, the fourth quarter of crank rotation the piston is going up and the rod is moved closer to the house.

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