my48stake Posted June 3, 2014 Report Share Posted June 3, 2014 I'm trying to put the flywheel back onto the crank of my '48 stake and one of the bolt holes appears to be smaller than the others so I'm having trouble getting one of the bolts in. All of the bolts appear to be the same size. Is one (or are all) of these a press fit? Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted June 3, 2014 Report Share Posted June 3, 2014 I believe one hole is offset slightly so that the flywheel can only go on one way. Try rotating the flywheel around until all 4 holes line up perfectly. Merle Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted June 3, 2014 Report Share Posted June 3, 2014 Merle is correct. Once you find the right combination I suggest you mark it with a center punch or a paint stick or both. Makes assembly much easier next time. Quote Link to comment Share on other sites More sharing options...
my48stake Posted June 3, 2014 Author Report Share Posted June 3, 2014 Thanks guys, I actually got the orientation part right The problem is that one of the holes in the flywheel is .010" smaller in diameter than all the others. The bolts are all the same size and it's an interference fit on this one hole. Should it be pressed in? Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted June 3, 2014 Report Share Posted June 3, 2014 Should not be pressed in. Are you using the same bolts that came out? Quote Link to comment Share on other sites More sharing options...
my48stake Posted June 3, 2014 Author Report Share Posted June 3, 2014 Should not be pressed in. Are you using the same bolts that came out? Yes, I put them in a labeled bag and the rest of them fit perfectly which is why I'm confused. Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted June 3, 2014 Report Share Posted June 3, 2014 The four crankshaft holes should all be the same size. The factory flywheel bolts are a special shaped bolt and were a semi tight fit. The head of the bolt has a slice cut off of it to match the stepped crank flange and to prevent the bolt from turning. The threaded part of the factory bolt goes to the rear of the truck. These flywheel bolts usually need to be tapped into place with a drift if in like new condition. Bob Quote Link to comment Share on other sites More sharing options...
54Illinois Posted June 4, 2014 Report Share Posted June 4, 2014 I am swapping S15-1 engines....will the same apply? Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted June 4, 2014 Report Share Posted June 4, 2014 I am swapping S15-1 engines....will the same apply? The "S" indicates a Desoto 25" long block engine with an 8 hole crankshaft flange. What car is this going into? Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted June 4, 2014 Report Share Posted June 4, 2014 If you have a 8 bolt DeSoto crank in your truck project disregard what i posted above. I thought your truck had the original engine. I'll let others advise you. Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted June 4, 2014 Report Share Posted June 4, 2014 If you have a 8 bolt DeSoto crank in your truck project disregard what i posted above. I thought your truck had the original engine. I'll let others advise you. The guy with the Desoto is not the same guy as the thread starter. Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted June 4, 2014 Report Share Posted June 4, 2014 I guess I was up too late last night Don! Thanks for keeping an eye out on me!!! Quote Link to comment Share on other sites More sharing options...
my48stake Posted June 4, 2014 Author Report Share Posted June 4, 2014 If you have a 8 bolt DeSoto crank in your truck project disregard what i posted above. I thought your truck had the original engine. I'll let others advise you. So, it is the original engine/crank in my truck and it has an 8 bolt crank Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted June 5, 2014 Report Share Posted June 5, 2014 Your truck must be a 1 ton (B1D to use 8 flywheel bolts. The engine should be a 230 ci with a starting engine # T146-.....Don't know why your bolts wont go in. A picture of the special flywheel bolts with notched nut and star washer. Quote Link to comment Share on other sites More sharing options...
52b3b Joe Posted June 5, 2014 Report Share Posted June 5, 2014 To me, it still sounds like the flywheel isn't rotated correctly to match the crank holes. You can't tell by looking at the holes for the most part. The one that is different isn't off by much. Try rotating the flywheel around the 8 ways and see if it fits one way again. I put an 8 hole crank in my truck and it took me a few attempts to clock the flywheel to it. 1 Quote Link to comment Share on other sites More sharing options...
54Illinois Posted June 5, 2014 Report Share Posted June 5, 2014 The S15-1 is going in a 52 Desoto that had a S15-1 that went bad. I looked an they all appear the same. I did notice some indentations on the flywheel and crank. Will try that. Sorry for the HiJack! Quote Link to comment Share on other sites More sharing options...
MBF Posted June 5, 2014 Report Share Posted June 5, 2014 I think what Joe said probably is the case here. I had the same issue when I went to the flywheel back in my slant 6. It took several attempts before I got the flywheel indexed correctly. There are 8 potential possibilities, but only 1 that actually works! Mike Quote Link to comment Share on other sites More sharing options...
my48stake Posted June 5, 2014 Author Report Share Posted June 5, 2014 Yes, it is a B1D. It's not an indexing problem. 7 of the 8 bolts fit through the holes in the flywheel. The 8th bolt is the same size as all the others but the 8th hole in the flywheel is about .010" smaller in diameter. In other words, the bolt doesn't fit in the hole even with the flywheel and bolts in the garage on the workbench (not on the crank). Quote Link to comment Share on other sites More sharing options...
NiftyFifty Posted June 5, 2014 Report Share Posted June 5, 2014 Im missing something... Are you not using all of the original bolts and original pieces? I'm guessing with only a .010 difference no other standard size bolt will fit, but if its a threaded hole then something is wrong... Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted June 5, 2014 Report Share Posted June 5, 2014 Is there a burr of some sort in that hole? I've never heard of having one flywheel hole slightly smaller than the rest. Especially only .010" smaller. Can you file it open enough for the bolt to pass through? Merle Quote Link to comment Share on other sites More sharing options...
_shel_ny Posted June 5, 2014 Report Share Posted June 5, 2014 "There is a fifth dimension beyond that which is known to man. It is a dimension as vast as space and as timeless as infinity. It is the middle ground between light and shadow, between science and superstition, and it lies between the pit of man’s fears, and the summit of his knowledge. This is the dimension of imagination. It is an area which we call ... The Twilight Zone." They came out, they must go back 1 Quote Link to comment Share on other sites More sharing options...
ggdad1951 Posted June 5, 2014 Report Share Posted June 5, 2014 (edited) yah, run a tap thru it of nothing else. 0.010" on diameter should not be causing such issues! Maybe one of your bolts is smaller! Edited June 5, 2014 by ggdad1951 Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted June 5, 2014 Report Share Posted June 5, 2014 Suspect there may be some burnt oil that has turned into shellac in that hole. Try cleaning it with a sharp small bladed knife. Quote Link to comment Share on other sites More sharing options...
Jeff Balazs Posted June 5, 2014 Report Share Posted June 5, 2014 Not sure if this helps but the parts book calls for 8 bolts all the same size. Jeff Quote Link to comment Share on other sites More sharing options...
54Illinois Posted June 5, 2014 Report Share Posted June 5, 2014 In my case, i just figure it is operator error... Quote Link to comment Share on other sites More sharing options...
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