Bryan Posted January 6, 2022 Report Share Posted January 6, 2022 I was looking around to get a timing gear set and noticed the new double row ones like mine have squared off valleys in the teeth. Seems like the originals fitted tighter with rounded teeth/valleys. Does anybody think there will be a quality difference? I don't think mine wore like that. Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted January 6, 2022 Report Share Posted January 6, 2022 Just a different design between manufacturers. Nothing to worry about. However, it makes it very important to get your sprocket and chain set from the same supplier because of this. Another member here discovered this recently when he got a miss matched set and the chain wouldn't work properly with the sprockets. 2 Quote Link to comment Share on other sites More sharing options...
James_Douglas Posted January 7, 2022 Report Share Posted January 7, 2022 (edited) The one thing that tossed me for a loop was after I mounted the thing in place I noticed that the two gears were NOT in the same plane. I had to order shim stock and jet cut some shims to move out the crankshaft sprocket a little to have both gears dead flat on the same plane. All new gears and chain. When you start mixing crankshafts, camshafts and new gears, sometimes something is not going to line up. James Edited January 7, 2022 by James_Douglas 1 Quote Link to comment Share on other sites More sharing options...
Matt Wilson Posted January 9, 2022 Report Share Posted January 9, 2022 (edited) As Merle said, I doubt it matters whether the sprocket has square or round valleys, as long as the chain and sprockets are matched to each other. I have sprockets that are square bottomed and others that are round bottomed (different engines, but both flatheads and they worked fine). I have pics of a double row crank sprocket with square bottoms and another with round bottoms. Í just got a new phone and am having trouble posting them, but let me know if you want to see them and I'll get them posted. Oh, and I'm the guy Merle was talking about who was having trouble with the mismatched timing set, so I've gained some familiarity with these parts. Still working on that, but I'm sure we'll get it worked out. Edited January 9, 2022 by Matt Wilson 1 Quote Link to comment Share on other sites More sharing options...
Matt Wilson Posted January 9, 2022 Report Share Posted January 9, 2022 On 1/6/2022 at 8:29 PM, James_Douglas said: The one thing that tossed me for a loop was after I mounted the thing in place I noticed that the two gears were NOT in the same plane. I had to order shim stock and jet cut some shims to move out the crankshaft sprocket a little to have both gears dead flat on the same plane. All new gears and chain. When you start mixing crankshafts, camshafts and new gears, sometimes something is not going to line up. James James, I wonder if you have a later camshaft hub on your camshaft, paired with an earlier crankshaft or crankshaft sprocket. It was recently pointed out to me in a separate thread in the truck forum that there was a change of part numbers at a certain point in time. I have what I believe to be an earlier camshaft and sprocket hub and a later camshaft and sprocket hub in my possession, and they are nearly identical (and certainly appear that way visually), but the later hub is a little thicker in the bolt flange than the earlier one, and this seems to result in a greater distance from the back of the thrust plate to the front of the hub flange, by about 0.010 -0.012". This would place the sprocket forward by that amount. Is this about the amount you had to use when shimming, in order to get the two sprockets to line up? I'm putting together a later block and cam with what I think may be an earlier crankshaft, so I'm wondering if I'll need to swap hubs from the earlier cam to the later cam to get the sprocket spacing correct. Of course, I'll do a test of the parts as they are currently before making such a swap, but I'm trying to get a heads-up to be a little more informed. Thanks. Quote Link to comment Share on other sites More sharing options...
James_Douglas Posted January 9, 2022 Report Share Posted January 9, 2022 I think is was a lot more on the order of 30 thousands. I have a photo that is labeled "thirty-three-thou". In any case I would mount what I was going to use and do what I did which was take a long straight edge and place it on the large gear and see if the small gear is on the same plane. If not, shim it out until it is. The shims do not rotate separate from the gear or the shaft to once on they will never wear or cause any other issues. Having the chin not have any side thrust is a very good idea! James Quote Link to comment Share on other sites More sharing options...
Matt Wilson Posted January 9, 2022 Report Share Posted January 9, 2022 20 minutes ago, James_Douglas said: I think is was a lot more on the order of 30 thousands. I have a photo that is labeled "thirty-three-thou". In any case I would mount what I was going to use and do what I did which was take a long straight edge and place it on the large gear and see if the small gear is on the same plane. If not, shim it out until it is. The shims do not rotate separate from the gear or the shaft to once on they will never wear or cause any other issues. Having the chin not have any side thrust is a very good idea! James Yes, absolutely, you don't want those sprockets to be misaligned... very bad way to run. I'll be sure to check what I've got first, before changing anything. Where did you get the shim stock? I suppose it can be found on Amazon, but maybe there are better sources. Quote Link to comment Share on other sites More sharing options...
Sniper Posted January 9, 2022 Report Share Posted January 9, 2022 Shims https://www.mcmaster.com/Shims/ring-shims-7/ 2 Quote Link to comment Share on other sites More sharing options...
James_Douglas Posted January 9, 2022 Report Share Posted January 9, 2022 I purchased stock and had a machine shop cut them out on a jet cutter. One pass on the shim stock mounted on a block of wood and they cut out a bunch of 10 thou and one thou shims for me. James 1 Quote Link to comment Share on other sites More sharing options...
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