DragBikeMike
Serious Thumper
Offline
SuzukiSavage.com Rocks!
Posts: 4197
Honolulu
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Without tightening the nuts, the free length of the stud was 7.911”.
Then, I installed a copper washer under the nut, lubricated the washer, threads, and the face of the nut with clean engine oil, and tightened it in four increments. First 70 in-lbs, then 150 in-lbs, then 220 in-lbs, and finally 280 in-lbs. Tightened to 280 in-lbs, I measured the stud.
Lubricated with engine oil, the stud stretched .019”. It was 7.911” unstressed, and at 280 in-lbs torque it measured 7.930”.
Then I repeated the test using the Permatex sealant. I lubricated the threads with clean oil, and applied sealant to the faces of the washer and nut. At 280 in-lbs torque, the stud measured 7.920”. That’s only .009” stretch, less than half of what it stretched when I used oil. That didn’t look good to me.
After getting the same results several times, I decided to test some other sealants. Here are the results of the tests.
Engine Oil: .019” Permatex Optimum Grey #27036: .009” Permatex Optimum Black #27037: .009” DAP Silicone Gasket Sealant: .010” VersaChem Type 2 Gasket Sealant: .015” Loctite 242 Blue Thread Sealant: .024” Permatex High Temp PTFE Thread Sealant #PX59214: .021” Loctite High Temp PTFE Thread Sealant #592: .023”
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