Hubert_25-25 Posted November 7, 2017 Share Posted November 7, 2017 (edited) I am looking for information and 2 parts. This is a view of the input to the starter generator on my 1925 Standard. The previous owner put this large broken oversized lock washer in here. Can anyone tell me what part goes directly under the bolt head with the slot cut in the head? Is it a serrated lock washer? There are some light radial grooves cut into the drive mechanism. I am also looking for the "coupling ring" that goes between the rear of the water pump and against this starter drive mechanism. This should be the same for all 1922-24 4 cyl, and 1925 standard. Thank you, Hugh Edited November 8, 2017 by Hubert_25-25 (see edit history) Link to comment Share on other sites More sharing options...
Terry Wiegand Posted November 7, 2017 Share Posted November 7, 2017 Hugh, the piece that you are looking for is called an Oldham coupling. I think that I have what you are needing. I will post some photos this evening along with measurements. Terry Wiegand South Hutchinson, Kansas Link to comment Share on other sites More sharing options...
Terry Wiegand Posted November 8, 2017 Share Posted November 8, 2017 Hugh, here is the photo of the coupling that I think you are looking for. The dimensions are as follows - Outside Diameter - 1.655" Inside Diameter - 1.090" Thickness - .345" Slots (4) - .312" wide X .195" deep Let me know if this is what will fit your starter/generator input. 2 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted November 8, 2017 Author Share Posted November 8, 2017 Terry, You are just making my day. Since mine is missing, perhaps someone can tell from your dimensions if this is the correct one for all 1922-24 4 cyl, and 1925 standard. It looks right to me. Hugh Link to comment Share on other sites More sharing options...
DonMicheletti Posted November 8, 2017 Share Posted November 8, 2017 If you end up making one, it must be at least case hardened, otherwise it will wear quickly. 1 Link to comment Share on other sites More sharing options...
Terry Wiegand Posted November 8, 2017 Share Posted November 8, 2017 Don is right about the material being hardened. Hugh, check the outside diameter of the mating part on the end of the water pump / starter/generator shaft. This will tell you if the coupling that I have will work for your application. I really suspect that what I have will be what you are needing. The outside diameter of the shaft coupling part is 1.660" Here are a couple of photos to show the application. Terry Wiegand South Hutchinson, Kansas Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted November 8, 2017 Author Share Posted November 8, 2017 Terry, it looks correct, but mine is larger. Mine is 2.435 OD, and the slots would need to be .363 wide minimum to fit. Thanks for the photos and dimensions. Yours must be for a pre 1922? Hugh Link to comment Share on other sites More sharing options...
Terry Wiegand Posted November 8, 2017 Share Posted November 8, 2017 Well, darn, we tried anyway. Sorry that this did not work out. Buick was really changing things as they went along. You will more than likely end up making the piece. This will be a really simple thing to machine. Terry Wiegand South Hutchinson, Kansas Link to comment Share on other sites More sharing options...
Jim Bourque Posted November 8, 2017 Share Posted November 8, 2017 Hugh I may have one, will look this weekend and measure. Jim 1 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted November 9, 2017 Author Share Posted November 9, 2017 I appreciate all the help in locating an "Oldham coupling". I also appreciate the extra photo that Kevin sent. I think I still need to clarify what I am looking for regarding what is under the head of the starter generator input bolt head. The serrations on the top side of the part with the D shaped center must mean something. Its tough when the parts book does not have an exploded view. Thanks again for all the help. Hugh Link to comment Share on other sites More sharing options...
Terry Wiegand Posted November 9, 2017 Share Posted November 9, 2017 Hugh, this might be a long shot, but, I think I'd call Rex Curtiss at Precision Power in Lansing, Michigan. The phone number is (800) 794-5962. Their email address is - www.precision-pwr.com Rex Curtiss has been working on these Delco starter/generator units for a very long time and if anybody would know about what you are looking for, it would be him' Terry Wiegand South Hutchinson, Kansas 2 Link to comment Share on other sites More sharing options...
dibarlaw Posted November 9, 2017 Share Posted November 9, 2017 (edited) Hugh: I will check one of my spare S/Gs as I believe they were pretty well stripped and the distributor casting was missing. The Master S/G that still has a distributer housing shows a lock washer against the serrated face and that is all. It does not look as it this section has ever been separated on this unit. Oh wait! I have my Standard's S/G in a box on the running board while the engine is out.... Just a lock washer. Coupling plate. Part#44402 Water pump shaft coupling. Larry Edited November 9, 2017 by dibarlaw (see edit history) 1 Link to comment Share on other sites More sharing options...
Jim Bourque Posted November 9, 2017 Share Posted November 9, 2017 Hugh Larry is correct, just special lock washer under the bolt. The serrations are there to help the lock washer lock as it's hardened. I would be concerned as to why shaft is sitting proud of the serrerated piece. just my 2 cents Jim 1 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted November 10, 2017 Author Share Posted November 10, 2017 Larry, Terry and Jim, Thanks for the comments and the extra photos. The previous owner put a lock washer under the head ,but it was so large and the wrong size, I was not sure what belonged there. I have two SG units, and one shaft does sit proud as Jim suggests, so I will look into that when I start rebuilding these. Hugh Link to comment Share on other sites More sharing options...
sligermachine Posted November 10, 2017 Share Posted November 10, 2017 internal star locks are normally relay thin . Is that for miss Aline meant double slot or a clutch ? Link to comment Share on other sites More sharing options...
sligermachine Posted November 10, 2017 Share Posted November 10, 2017 ez to produce . I have 4 SG on my floor what does the rest look like i might have one 1 Link to comment Share on other sites More sharing options...
tonybuick Posted November 27, 2017 Share Posted November 27, 2017 hi Hugh and all sorry for the delay busy at work but I dug out a spare coupling and measured it hope you can make sense of it if you need more info let me know as I can find it easily now thanks tony 1 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted November 27, 2017 Author Share Posted November 27, 2017 Tony, Thank you so much for the dimensions on the coupling. I assume the milled slots are 90 degrees apart, and the bottom milled slot is not shown. This really helps with the search. Hugh Link to comment Share on other sites More sharing options...
Brian_Heil Posted November 27, 2017 Share Posted November 27, 2017 Hubert, I have a couple extras of the couplings for my 1923 6 cylinder. Let me know if you need me to dig them out. Brian 1 Link to comment Share on other sites More sharing options...
Leif Holmberg Posted November 27, 2017 Share Posted November 27, 2017 Brian-Hubert,the same parts number on 1923 6 cyl as 1925 Std."couplings".# 44402 Leif in Sweden. 2 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted November 28, 2017 Author Share Posted November 28, 2017 Leif, Thanks for the follow up. I did not read the big parts book correctly. You are correct. It is all Buicks 1921-1925. Brian, I will PM my address to you. Thank you Hugh 1 Link to comment Share on other sites More sharing options...
Brian_Heil Posted November 28, 2017 Share Posted November 28, 2017 Hugh and I are in contact. Stay tuned. This is what the BCA and Forum are all about! 3 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted March 22, 2018 Author Share Posted March 22, 2018 (edited) I wanted to follow up on the the parts that were missing from the two starter generator units that I have. I thought with having two, that I could pull one apart and use the other for reference, but identical parts were missing from both units. How strange is that. The big part missing was the Oldham coupling. Terry Weigand had a spare, but it was an earlier year and smaller. Tony in New Zealand took the time and created a drawing to provide dimensions. Don Micheletti specified the part needed to be hardened. Brian Heil and Kyle Sliger both came to my rescue with having correct sized Oldham couplings. Leif in Sweden verified the proper year cross reference. Brian ultimately sent me a coupling since he had other items from a "rusty parts" SG unit that he dismantelled for me. There is a short bushing (spacer) between the armature and the starter clutch that was missing in both of my units. Jim Bourque correctly identified this problem in the photos which I had not noticed. Brian sent me that bushing, and I had a friend make a duplicate for my other SG unit. The lock washer that is under the bolt that holds on the starter generator clutch that Larry DiBarry sent a picture of, I was able to get from Brian as well. It is a special lock washer, but I think considered a "flat lock washer". A style that is no longer available. The modern lock washers just don't do what this style does, so I will either use a star washer here, or put a small space on the inside of a standard lock washer to keep it centered, as the ID is too large for the bolt. The drab olive green paint is drying on the case so I should be able to start assembly soon. Thanks to all of you for the help. It truly takes a village to raise a Buick. Hugh Edited March 22, 2018 by Hubert_25-25 (see edit history) 2 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted July 22, 2018 Author Share Posted July 22, 2018 I finally have one of my two 1925 Starter Generators reassembled. New bearings, brushes, everything disassembled cleaned, regreased and ready to go. I would like to bench test it, but I need to borrow a 6 volt battery from a friend. This is an amazing contraption of levers, springs and a clutch. Thanks to all for help with the missing parts. It took parts from no less than 6 different sources. Hugh 2 Link to comment Share on other sites More sharing options...
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