Just making sure I don't ruin something. Trying to get the pully off the end of the crankshaft on a 430 gas engine. There is a nut with a half inch square opening holding it on. I have used an air impact to back it off with no success. Before I get too aggressive, could it be left hand threads? Any suggestions? Thanks
- Thread starter Kirk-Tx
- Start date
chuck machinist
Well-known Member
You are experiencing a common issue with that component. You need to spray your favorite penetrant on the bolt in question. be abundant with the penetrant. Take a heat wrench and bring the temperature to roughly 200 degrees, but not to hot as to glowing red. Respray with penetrant. Impact wrench and appropriate socket counterclockwise. Patience, Been there ,done that! CM
Crankshaft nut Case p/n A35673. Milspec description.
Steel; 2.000 in. largest od, 1.375 in. smallest od; one end thd internally, 7/8 in. 14UNF-2B, rh thd size, 0.900 in. thd lg; other end with internal wrenching feature, 0.510 in. sq; with 0.500 in. thk collar spaced 0.250 in. distance from one end and 0.500 in. from the other.
Raise the front, penetrate, patience, strong impact 1000 Ft lbs nominal. I don't do heat wrench on crankshafts, your mileage may vary.
Joe
Steel; 2.000 in. largest od, 1.375 in. smallest od; one end thd internally, 7/8 in. 14UNF-2B, rh thd size, 0.900 in. thd lg; other end with internal wrenching feature, 0.510 in. sq; with 0.500 in. thk collar spaced 0.250 in. distance from one end and 0.500 in. from the other.
Raise the front, penetrate, patience, strong impact 1000 Ft lbs nominal. I don't do heat wrench on crankshafts, your mileage may vary.
Joe
I use heat on many stubborn fasteners but not on hard to replace/expensive parts. If you're going to be other than a pretend mechanic buy a decent impact. For most of us it's a onetime purchase and well worth having a good one. I have two, a small 1000 ft/lb 1/2" drive IR and a larger 3/4" 250 psi IR that I don't even remember the ft/lb rating.
Joe
chuck machinist
Well-known Member
Ingersol Rand is the top of the line product.CM
I have a friend who works in a heavy equipment shop, He has a 3/4 drive IR, I believe, but he told me that one of the other mechanics has a big Harbour Freight 3/4 drive and that is the go to gun when all the others fail, he say it is a beast. OH, and in 50+ years I never hurt a crank or a nut. I can only imagine how many I did over my career, it wasn't a hobby for me, My job required my minutes count. Nice now though, I can take all day to do something and not cost anybody anything.
IRs are good good guns for durability, my son dealt with a Mac Tool truck guy and got me a Mac 1/2 drive gun and I have twisted 3/4 rear tractor axle boles off with it, it is a good strong gun, I believe it is made by Air Cat, actually he gave me two new guns and one is still in the original box and looks as new, I used the old Mac for many years as a professional mechanic and had it rebuilt once. In our shop, the owners had the IR 231 guns and they worked well but are not as potent as some others, I have had Snap On guns and the Macs made them look bad. Nice not to have to use them much any more but I still have all my tools.
IRs are good good guns for durability, my son dealt with a Mac Tool truck guy and got me a Mac 1/2 drive gun and I have twisted 3/4 rear tractor axle boles off with it, it is a good strong gun, I believe it is made by Air Cat, actually he gave me two new guns and one is still in the original box and looks as new, I used the old Mac for many years as a professional mechanic and had it rebuilt once. In our shop, the owners had the IR 231 guns and they worked well but are not as potent as some others, I have had Snap On guns and the Macs made them look bad. Nice not to have to use them much any more but I still have all my tools.
IRs are good good guns for durability, my son dealt with a Mac Tool truck guy and got me a Mac 1/2 drive gun and I have twisted 3/4 rear tractor axle boles off with it, it is a good strong gun, I believe it is made by Air Cat, actually he gave me two new guns and one is still in the original box and looks as new, I used the old Mac for many years as a professional mechanic and had it rebuilt once. In our shop, the owners had the IR 231 guns and they worked well but are not as potent as some others, I have had Snap On guns and the Macs made them look bad. Nice not to have to use them much any more but I still have all my tools.
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