stan's52 Posted July 30, 2011 Report Posted July 30, 2011 I got a surprise when I went to install the flywheel bolts on my 52 motor. Someone drilled out all the threads on the crank flange. Now my only option is a heli coil, which is rather expensive, because a heli coil tap is needed. So my other option is tap to the next bigger size which is 1/2-20, and drill out my flywheel to 1/2. I don't know why this was done, as the fly wheel holes are not wobbled out. Just another day in the neighborhood. Stan Quote
Young Ed Posted July 30, 2011 Report Posted July 30, 2011 Are you sure?? I've never seen a flathead with a threaded crank flange. They all have shoulder bolts and nuts some go with the head towards the engine and some the other way though. Quote
Don Coatney Posted July 30, 2011 Report Posted July 30, 2011 Did you disassemble this engine? Why do you think the crankshaft holes were originally threaded? As Young Ed said I have never seen a crankshaft with threaded holes. Some require factory specific bolt heads. But all require bolts with a shoulder long enough that the threaded portion of the bolt is not in the shear area. Quote
stan's52 Posted July 30, 2011 Author Report Posted July 30, 2011 I just assumed they were threaded, my mistake, Now I need to find the special bolts. Who sells them? I will probably need to raise the crank. Which will not be much of a problem it is still in my engine stand. This is what happens when you buy a basket case. Thanks for the info. Stan Quote
Young Ed Posted July 31, 2011 Report Posted July 31, 2011 If the crank has a raised area you need the special bolts that have a flat to go against that. If your crank is smooth you can use grade 8 bolts from the hardware store. You will need to buy a long enough bolt to have about an inch of shoulder. Quote
stan's52 Posted July 31, 2011 Author Report Posted July 31, 2011 Looks like my flywheel crank bolt area has the step,so I will need the bolts with a flat side. What if I mill a regular grade 8 bolt with the correct shoulder area off so it has one flat side? Think there will be enough head on the bolt left? Stan Quote
Joe Flanagan Posted July 31, 2011 Report Posted July 31, 2011 McMaster-Carr has them. That's where I got mine. Worth it for the peace of mind. You don't want to have to go back in there again. Quote
stan's52 Posted July 31, 2011 Author Report Posted July 31, 2011 I also like to use the correct parts, but at this moment the correct parts do not exist for me. I will make some calls tomorrow to see what comes up.Anyone have any extra flywheel bolts? Stan Quote
Joe Flanagan Posted July 31, 2011 Report Posted July 31, 2011 In addition to McMaster-Carr, try Vintage Power Wagons and Terrell Machine. I'm sure they both have them. Quote
Greenbomb Posted July 31, 2011 Report Posted July 31, 2011 There should be a generic version available in your area. It just won't be at Home Depot or True Value. There should be some kind of industrial supply house near you. Quote
Don Coatney Posted July 31, 2011 Report Posted July 31, 2011 I also like to use the correct parts, but at this moment the correct parts do not exist for me. I will make some calls tomorrow to see what comes up.Anyone have any extra flywheel bolts? Stan You must learn to know exactly what you need. From your postings to date I dont think you know exactly what you need. Suggest you do a forum search to learn what you need. This subject has been discussed many times. Once you learn exactly what you need someone here may be able to assist. Quote
stan's52 Posted July 31, 2011 Author Report Posted July 31, 2011 The picture from Dodgeb4ya was exactually what I needed. Now the search narrows. Like I said if I can't locate the correct ones, wich I perfer,I guess my next option will be a grade 8 bolt, and turn down the head a little. I wonder why the Chrysler folks thought bolts were the way to go here. Every other vehicle or tractor I have come in contact with, has the crank threaded and the flywheel held in place with bolts,and a dowell pin. This is what threw me for a loop. Now off to find 12 valve spring retainers, Again thanks for the help. Stan Quote
TodFitch Posted August 1, 2011 Report Posted August 1, 2011 (edited) Valve keeperNAPA ask for VK63, or SEP VK63. not sure how the store lists it. $0.49 each Okay, the illustrations on the NAPA Online web site for the SEP VK63 sure do look like the correct keepers. But they don't list them as an interchange with Chrysler number 1313268 which is what the parts book calls for for the 1936-38 Plymouth motors. Did that change for 1952 and the keepers are in someway different. Or am I safe listing the NAPA SEP VK63 as a good interchange for 1936-48? Edit: Cancel that, the VK63 is the valve spring retainer LOCK, Chrysler part number 395931. So I still don't have a cross for the retainer, just the locks. Edited August 1, 2011 by TodFitch Quote
Big_John Posted August 1, 2011 Report Posted August 1, 2011 My local NAPA warehouse didn't stock the valve locks and would have to order from Sealed Power. I got them from Rock Auto instead. Quote
stan's52 Posted August 1, 2011 Author Report Posted August 1, 2011 Back in business. I found the flywheel bolts from Vintage Power Wagon, he also had the valve spring keepers, and retainers I needed. Thanks for all those who took time to look up part numbers. stan Quote
Joe Flanagan Posted August 1, 2011 Report Posted August 1, 2011 Stan, you should be getting the oil tube for the timing chain in the mail any day now. Quote
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