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Discussion Forum
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A and 620 Cam shaft

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ToddF

04-15-2003 12:23:39




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Does anybody on this board know what the technical differences are between the cam shafts in the late model A and the 620? I've been told that they will interchange directly, but nobody seems to know what the differences are, if any. In the event that nobody knows, can anybody tell me who I might ask to get this info? Thank you---ToddF




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G-MAN - a little more info....

04-15-2003 16:01:16




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 Re: A and 620 Cam shaft in reply to ToddF, 04-15-2003 12:23:39  
The late-styled "A" parts book on EPC shows substituting the bearings and bearing housing used on the 620 with a different cam number, which would tend to support my service parts theory. Using a later part number to replace an earlier one was commonly done, as it eliminated the need to stock two part numbers when one could satisfy both. It would appear that you could rob the bearing housing and camshaft out of a 620 for use in an "A", although it wouldn't be possible to do it the other way around, given the distributor drive issues that Clooney mentioned. If your "A" cam is bad or questionable, there are several places that regrind them for stock use or performance applications. It's cheap insurance, as "eyeballing" a cam will tell you next to nothing about it's actual condition.

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Clooney

04-15-2003 15:32:44




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 Re: A and 620 Cam shaft in reply to ToddF, 04-15-2003 12:23:39  
ToddF, I don't know about the differences in lift & duration [that would be a good question for the puller board]. The biggest difference is the mag on the "A" was driven from the end of the governor & the distributor on the 620 is driven from a gear on the R/H end of the camshaft, so the camshaft on the 620 was machined to accept that drive gear [the "A" wasn't]...



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G-MAN

04-15-2003 15:18:30




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 Re: A and 620 Cam shaft in reply to ToddF, 04-15-2003 12:23:39  
I believe the actual specs are identical, such as lift, lobe separation, duration, etc. It's probably a case where the later 620 camshaft became the service part for the earlier tractors, when the earlier cams where no longer available.



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