Charlie G Posted March 31, 2018 Share Posted March 31, 2018 Since my engine is being rebuilt by someone other than me, I have been asked why the 3 attachment holes have different sizes. The center opening is small and the other 2 are larger even though the holes in the block appear to be the same size. What is the purpose of the larger openings? Do these openings have some type of insulating or isolating rubber components or is there some other reason? It was not on the engine when I got the engine so I never saw how it was mounted. Link to comment Share on other sites More sharing options...
dibarlaw Posted March 31, 2018 Share Posted March 31, 2018 Charlie: There should be bushings to take up that space. These units need to be placed very precisely for all the starter pedal to gears to starter/generator and then finally to the flywheel to do their job. What is the unit off of? A 1925 Buick? Link to comment Share on other sites More sharing options...
46 woodie Posted March 31, 2018 Share Posted March 31, 2018 You might be able to use a "drill bushing", McMaster-Carr has just about any size you can need. If it is indeed from a Buick perhaps someone from the Buick Club can answer your question. Link to comment Share on other sites More sharing options...
Charlie G Posted March 31, 2018 Author Share Posted March 31, 2018 I believe it was off of a 1925 Buick but I'm not certain Is there any way to tell from the data plate? Link to comment Share on other sites More sharing options...
Brian_Heil Posted March 31, 2018 Share Posted March 31, 2018 Here’s a pic of the two bushings that do the alignment pay at no attention to the Oiler. The third bottom hole does not have a bushing. Click over a few Forums to the AACA Buick Pre War Forum and join the fun over there. Link to comment Share on other sites More sharing options...
Brian_Heil Posted March 31, 2018 Share Posted March 31, 2018 (edited) There is a stamped number in the cast housing near the data plate Should be something like D-268. Often stamped lightly and tough to see. But Delco changed the design and number almost every year and unfortunately their interchangeability too We have all the Buick #s in a post over on the Buick Pre War Forum. Edited March 31, 2018 by Brian_Heil (see edit history) Link to comment Share on other sites More sharing options...
Brian_Heil Posted March 31, 2018 Share Posted March 31, 2018 And note the two holes and the two bushings have a matching taper. Link to comment Share on other sites More sharing options...
46 woodie Posted March 31, 2018 Share Posted March 31, 2018 Looks like Brian to your to your issue. That eliminates the drill bushings that I suggested. Any machine shop can fabricate the tapered bushings for you. Link to comment Share on other sites More sharing options...
dibarlaw Posted April 1, 2018 Share Posted April 1, 2018 Charlie: Here is the list of Buick Delco units and their application #s. My 1925 Master takes the D-268 and the 25 Standard takes a D-283. Link to comment Share on other sites More sharing options...
Charlie G Posted April 3, 2018 Author Share Posted April 3, 2018 Thanks Larry and Brian for all your info. I was barely able to read the stamped number by the data plate but could see 268, verifying the 25 master identity. If there was a D preceding it I could not see it. My engine rebuilder was glad to hear the bushings were needed which confirmed his suspicion. 1 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted July 22, 2018 Share Posted July 22, 2018 Charlie, You really should do your postings in the Buick Pre War section. You probably already made the 2 bushings, but here are the actual dimensions. I was missing a few parts, so I drew the dimensions as I knew others would be in the same boat. Hugh Link to comment Share on other sites More sharing options...
MCHinson Posted July 22, 2018 Share Posted July 22, 2018 I have moved this discussion to the Pre War Buick forum. You should find the best information on this subject among those who frequent this forum. 1 1 Link to comment Share on other sites More sharing options...
Terry Wiegand Posted July 22, 2018 Share Posted July 22, 2018 Just for a little tidbit of information (and by the way, I like Hugh's drawings - we'll make an engine ear out of him yet) the three screws on the front end of the S/G unit that hold the circular plate at the Oldham coupling are very special. They are called Cheese Head screws. The difference between a Fillister Head screw and a Cheese Head screw is that the Cheese Head screw is flat on the slotted side. Both screws have straight sides. See what a person can learn by playing with old Buicks. Terry Wiegand South Hutchinson, Kansas 1 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted July 22, 2018 Share Posted July 22, 2018 (edited) I am looking for those two "cheese head screws" now that Terry has enlightened me on the term. They must come from Wisconsin or something. The reason these are so odd is that they are #10-30 x 3/8". #10-32 is the current standard. There is nothing out there with this pitch and head design. In fact, I have not seen these used anyplace other than on this starter generator front plate. If you are digging, I am also looking for another oil filler for my spare Starter Generator as well. I do have a drawing of the oil filler, and I can make one if necessary. Hugh Edited July 23, 2018 by Hubert_25-25 (see edit history) Link to comment Share on other sites More sharing options...
Terry Wiegand Posted July 23, 2018 Share Posted July 23, 2018 Hugh, I may have some of these 'special' screws for you. I have three of these S/G units in the shop. Terry Wiegand South Hutchinson, Kansas Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted July 23, 2018 Share Posted July 23, 2018 Terry, That would be great. Hugh Link to comment Share on other sites More sharing options...
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