ski.dive Posted April 3, 2018 Share Posted April 3, 2018 (edited) Removed some ''old'' rusty spark plugs today= # AC-936. My Reatta has 62k original miles= ***I wonder if these are the original plugs from the factory????? Here you go See the difference acdelco 41-936 and the AC 936 spark plugs =See the pictures of both bellow. Here is a picture of the old/rusty AC 936 spark plugs that I just removed=They were like welded on. Edited April 5, 2018 by ski.dive (see edit history) Link to comment Share on other sites More sharing options...
2seater Posted April 3, 2018 Share Posted April 3, 2018 Do you have a photo? That doesn't sound like a typical AC part number convention? Link to comment Share on other sites More sharing options...
ski.dive Posted April 3, 2018 Author Share Posted April 3, 2018 AC-936 is stamped right on the spark plug. I tried to google AC-936 ,I can not find them, Of course they are made by AC They are so old that one of the plugs broke trying to remove them. Link to comment Share on other sites More sharing options...
2seater Posted April 3, 2018 Share Posted April 3, 2018 2 hours ago, ski.dive said: AC-936 is stamped right on the spark plug. I tried to google AC-936 ,I can not find them, Of course they are made by AC They are so old that one of the plugs broke trying to remove them. Yes, I tried the same thing as well as cross references to Champion and Autolite. Are they a standard type plug with the large center and side electrodes or maybe a thin wire thin wire platinum? Just out of curiosity, do they match the front? Strange. Link to comment Share on other sites More sharing options...
ski.dive Posted April 3, 2018 Author Share Posted April 3, 2018 YES, AC-936 ON THE FRONT 3 ALSO. Link to comment Share on other sites More sharing options...
jonlabree Posted April 4, 2018 Share Posted April 4, 2018 https://www.amazon.com/ACDelco-41-936-Professional-Platinum-Spark/d Link to comment Share on other sites More sharing options...
ski.dive Posted April 4, 2018 Author Share Posted April 4, 2018 46 minutes ago, 63viking said: https://www.amazon.com/ACDelco-41-936-Professional-Platinum-Spark/d No, those are acdelco 41-936, they do not look like that. The ones I removed just say- AC 936 ***These AC 936 were very rusty and have to be very old. Link to comment Share on other sites More sharing options...
2seater Posted April 4, 2018 Share Posted April 4, 2018 6 hours ago, ski.dive said: No, those are acdelco 41-936, they do not look like that. The ones I removed just say- AC 936 ***These AC 936 were very rusty and have to be very old. I have a couple of 90's spark plug catalogs and cannot find anything for a plug numbered like that all the way back to 1980 or so. I thought maybe Accel that uses a three digit number system but no #936. Very strange. Link to comment Share on other sites More sharing options...
jonlabree Posted April 4, 2018 Share Posted April 4, 2018 THEN POST A PICTURE ! Link to comment Share on other sites More sharing options...
jonlabree Posted April 5, 2018 Share Posted April 5, 2018 nice try. Check out this site and the plug chart at the bottom. https://herko.com/Retail/default-category/spark-plug-ignition-coil-set/new-genuine-acdelco-platinum-spark-plug-41-936.html Link to comment Share on other sites More sharing options...
jonlabree Posted April 5, 2018 Share Posted April 5, 2018 Aren't you going to tell me that they are not the same? Link to comment Share on other sites More sharing options...
ski.dive Posted April 5, 2018 Author Share Posted April 5, 2018 (edited) Here you go See the difference acdelco 41-936 and the AC 936 spark plugs =See the pictures of both bellow. Here is a picture of the old/rusty AC 936 spark plugs that I just removed=They were like welded on. Edited April 5, 2018 by ski.dive (see edit history) Link to comment Share on other sites More sharing options...
Ronnie Posted April 5, 2018 Share Posted April 5, 2018 When it comes to spark plugs, the brand and number you take out isn't that important, It's what you put back in that counts. 1 Link to comment Share on other sites More sharing options...
Bloo Posted April 5, 2018 Share Posted April 5, 2018 (edited) Most assembly line installed plugs of that time frame had a dot of paint on the tip where the wire connects. If this is wrong for the Reatta, hopefully someone will jump in here and correct me. I don't think these plugs are original. Plugs don't typically break from age. They break because the plug wrench put just a little too much force on the side of the insulator. The tools are not perfect, and sometimes it just happens, especially when the plugs are stuck. AC plugs of that time frame were mostly green. The blue would indicate something special, like Platinum or whatever. In fact, you can see the little pointy tip containing the platinum (or whatever they used) on the center electrode. The tip of the center electrode on a "normal" plug should be flat with sharp edges, burning to rounded edges as the plug wears out. Someone probably shelled out extra money for some special plugs. As Ronnie says, its what you put in that counts. Edited April 5, 2018 by Bloo (see edit history) Link to comment Share on other sites More sharing options...
2seater Posted April 5, 2018 Share Posted April 5, 2018 Those sure look like a double platinum from the little extra nubs on both electrodes. They also appear to be the nickel ? plated shell. I would doubt very seriously they are O.E. plugs. A little sidetrack: My Ford Ranger 4 liter uses a very similar wasted spark ignition. The factory plugs were single platinum, but two different part numbers from one side of the engine to the other. The platinum was on the ground electrode on one side and on the center electrode on the other side. I was never able to find those part numbers in the aftermarket where double platinum is the recommended replacement. My assumption is a cost saving move with decent life from the factory. Link to comment Share on other sites More sharing options...
jonlabree Posted April 5, 2018 Share Posted April 5, 2018 Did you check the plug chart in my post? Those are the plugs for Reatta. Manufactures do change their logo and design every so often. So I'm betting that they are the same plugs. Link to comment Share on other sites More sharing options...
ski.dive Posted April 6, 2018 Author Share Posted April 6, 2018 (edited) On 4/4/2018 at 4:13 PM, 2seater said: I have a couple of 90's spark plug catalogs and cannot find anything for a plug numbered like that all the way back to 1980 or so. No AC #936. Very strange. I have also searched the Internet and I can NOT find these - Quote AC 936 spark plugs= They are old. Quote Edited April 6, 2018 by ski.dive (see edit history) Link to comment Share on other sites More sharing options...
ski.dive Posted April 6, 2018 Author Share Posted April 6, 2018 On 4/4/2018 at 4:13 PM, 2seater said: I have a couple of 90's spark plug catalogs and cannot find anything for a plug numbered like that all the way back to 1980 or so. No AC #936. Very strange. I have also searched the Internet and I can NOT find these Quote AC 936 Quote spark plugs= They are old. Link to comment Share on other sites More sharing options...
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