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Discussion Forum

Int'l 560 distributor counterweight springs

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JCW

10-17-2001 06:41:25




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My tractor idled fine but wouldn't keep running at higher RPMs. I has a valve job done and machined the head then discovered my distributor had too much play in it. With my neighbors help, I took it apart and found the bronze bushings were worn. One was even broke in two. Oddly enough the exploded view of the distributor at the parts store doesn't show the lower bushing. It shows a bushing above the gear but not one below. I can't imaged they'd have steel running on steel there though. But it does appear the shaft below the gear has been turned down and the ID of the lower bronze bushing was not a standard size. I had to buy a heavy wall bushing and bore out the ID. So some modifications must have been made in the past. (This is just for curiosity, what is down there if there's no bronze bushing between the housing and the shaft? That would mean the OD of the original shaft at some point was greater than the OD of the gear. Seems odd.)

ANYWAY, here's the real question. When we took it apart we observed that the expansion springs on the counterweight were different. Different wire diameter, coil size, coil length and number of coils. It didn't make sense to have two different springs on the counterweights. We assumed someone had changed one in the past and that's what caused the excessive wear on the bushings. So I ordered new springs, only to receive, packaged together, two different springs just like the ones I removed. Now I don't know which spring goes where???? and why in the world would you have different amounts of spring pressure on the counterweights?

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REDHUSKY91

10-17-2001 09:32:33




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 Re: Int'l 560 distributor counterweight springs in reply to JCW, 10-17-2001 06:41:25  
the counterweights are in at idle and begun to move out by centrifical force as the rpm's go up.
So by having two different springs the one weight will move out at a lower rpm giving the timing a nice smoth curve. (a car runs 5 to 10 btd (before top dead center) degrees at idle and will reach a a total of 35 - to 40 total degrees at say 3000 rpm depending on manufactures specs . You can adjust that on a car for performance(make it open sooner), but it will decease fuel mpg. If the weights are the same then it does not matter which spring goes on which weight. If a spring unhooks or breaks would make it hard starting.

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