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#1
05-25-2018, 02:33 PM
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connecting rod hitting the fuel pump lobe on the cam
I'm changing out the camshaft on my K341AQS due to a broken compression relief tab. i got one from a 301AS out of a 122 when i installed it i lined up the timing marks. connected up the rod and was spinning it over and the connecting rod cap hits the fuel pump lobe on the cam. i have taken it in and out to make sure things were lined up. i even put back in my old cam. there is just a little clearance in the same spot. the new cam the timing dot in relation to the compression release parts seems to be in a different spot. what is going on? its not letting me upload some pictures too
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1979 1650, #1 tiller with one extension, 90 degree box mounted, 3 point. 1961 4 digit bringing back to life. I have the mower and 3 pint for it. The 1650 is the fastest mower in the neighborhood. 
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#2
05-25-2018, 03:42 PM
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So it seems the rod is barely hitting. When the bearing plate is out I can move it past the cam but not with it installed. The fuel lobe is ground in a different spot than my old cam and looks to be why it's hitting. The rod is aftermarket of eBay. I can see where it's hitting in the pics. It would need about .010 more clearance. So would it be better to take it off the rod cap or the cam. I don't use a fuel pump
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1979 1650, #1 tiller with one extension, 90 degree box mounted, 3 point. 1961 4 digit bringing back to life. I have the mower and 3 pint for it. The 1650 is the fastest mower in the neighborhood.
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#3
05-25-2018, 05:39 PM
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well i went ahead and filed the cam down a bit in the area. i have .020 clearance and nice transitions with no stress risers. i was thinking to to look at the points lobe to see if it was different, well it is. the 301 newish one has more duration on it compared to the original 341 one. the red and white marks are the timing dot on the other side of it.( the 341 pic the white mark should actually be 1 tooth down) they seem to start at the same spot. will it mater if the other has more duration. I'm not the smartest on the ignition system.
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1979 1650, #1 tiller with one extension, 90 degree box mounted, 3 point. 1961 4 digit bringing back to life. I have the mower and 3 pint for it. The 1650 is the fastest mower in the neighborhood.
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#4
05-25-2018, 06:22 PM
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Filing the cam was the wrong choice. Should have filed the rod. I've never seen one hit, ever. Not sure why yours is. But why on earth would a machinist choose to file on a machined journal on a cam, over filing an excessive seam on a non machined cast surface??
 No, the point lobe duration doesn't make any difference. Just put this thing together and stop trying to analyze the parts. Your making it harder than it is.
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#5
05-25-2018, 08:23 PM
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well i filed on the fuel lobe because i dont need it once so ever due to gravity feed. the cam files really well, i though it would have been carburized or something. i didn't wan to take more mass off the aluminum rod cap. i figured the cam had more meat to deal with. i did take off some of the flash off the rod cap also. i know i am anal. if i was at work it would be on v blocks on the start surface plate with the CMM arm to compare the 2 cams. my wife gives me shit all the time instead of just doing stuff.
ETA, filing the cap would have been way easier than the cam
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1979 1650, #1 tiller with one extension, 90 degree box mounted, 3 point. 1961 4 digit bringing back to life. I have the mower and 3 pint for it. The 1650 is the fastest mower in the neighborhood.
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