Whisler Posted November 26, 2017 Share Posted November 26, 2017 In the midst of a 3G alternator conversion, I find that my double groove alternator pulley is too thick to allow sufficient thread purchase for the mounting nut. I am in need of a single groove alternator pulley. Anyone have one laying around unused and neglected. If so let me know how much. This for a 1984 351W if that matters. Thanks. Link to comment Share on other sites More sharing options...
Gary Lewis Posted November 26, 2017 Share Posted November 26, 2017 I'll look tomorrow, but I don't know if I have a single or not. If I do it is yours. But, if so we will need to make sure it has the right width to the vee/groove. Link to comment Share on other sites More sharing options...
Gary Lewis Posted November 26, 2017 Share Posted November 26, 2017 I'll look tomorrow, but I don't know if I have a single or not. If I do it is yours. But, if so we will need to make sure it has the right width to the vee/groove. According to this neat page I found (Engines/Drive Belts), your alternator belt should be 15/32" wide. As said, I'll check to see what I have tomorrow after church. Link to comment Share on other sites More sharing options...
Whisler Posted November 26, 2017 Author Share Posted November 26, 2017 Thanks for checking. According to the some info that NumberDummy gave me, the groove should measure 0.38 on a the correct pulley but I will measure the old pulley and the width of the belt I was using in the morning also. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted November 26, 2017 Share Posted November 26, 2017 I'll look tomorrow, but I don't know if I have a single or not. If I do it is yours. But, if so we will need to make sure it has the right width to the vee/groove. Remember the offset you need to have for the belts to line up. I bought the L&L alternator mounting kit which came with a pulley and I think I sent it off to Gary. RJM used to sell the pulley inexpensively. If you have a lathe you can bore the center of yours a little deeper. I'm using the stock pulley with a flange nut and Loctite. When Bill and I met last week he said he had the startup squeak and went with a larger Taurus pulley. (I have a LRC regulator for that problem) The shaft size is common (15mm, I think) so it's not too hard to find something that fits. Link to comment Share on other sites More sharing options...
85lebaront2 Posted November 26, 2017 Share Posted November 26, 2017 Remember the offset you need to have for the belts to line up. I bought the L&L alternator mounting kit which came with a pulley and I think I sent it off to Gary. RJM used to sell the pulley inexpensively. If you have a lathe you can bore the center of yours a little deeper. I'm using the stock pulley with a flange nut and Loctite. When Bill and I met last week he said he had the startup squeak and went with a larger Taurus pulley. (I have a LRC regulator for that problem) The shaft size is common (15mm, I think) so it's not too hard to find something that fits. Jim, you have to remember, I have the poly groove (serpentine style) belts and the Taurus unit I got the pulley from was the same, just used a larger pulley, also mine is the uprated one RJM sold, 160 amps. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted November 26, 2017 Share Posted November 26, 2017 Jim, you have to remember, I have the poly groove (serpentine style) belts and the Taurus unit I got the pulley from was the same, just used a larger pulley, also mine is the uprated one RJM sold, 160 amps. I do know that. My suggestion was that a larger diameter (like the V-belt pulley I sent Gary) would stop the chirp, instead of swapping in an LRC regulator like I did. Link to comment Share on other sites More sharing options...
Gary Lewis Posted November 26, 2017 Share Posted November 26, 2017 I do know that. My suggestion was that a larger diameter (like the V-belt pulley I sent Gary) would stop the chirp, instead of swapping in an LRC regulator like I did. If I have that pulley, and I should, it'll be Whisler's. I'm using a two-groove pulley that I modified for Dad's truck, and may go serpentine on Big Blue, so certainly don't need it. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted November 26, 2017 Share Posted November 26, 2017 If I have that pulley, and I should, it'll be Whisler's. I'm using a two-groove pulley that I modified for Dad's truck, and may go serpentine on Big Blue, so certainly don't need it. You have it, unless it found a new home already. It may be two groove but I know *you* have a lathe. Link to comment Share on other sites More sharing options...
Whisler Posted November 26, 2017 Author Share Posted November 26, 2017 You have it, unless it found a new home already. It may be two groove but I know *you* have a lathe. I measured the pulley sheave i was using and it measures 0.38 inside lip to inside lip and the belt I was using measures 0.40. My pulley measurement agrees with the info that Number Dummy gave me but the belt I am using is definitely not a 15/32 even though your info says it should be. Strange as I don't see how a 15/32 belt would work in a 3/8 groove. Link to comment Share on other sites More sharing options...
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