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techtalk:ih:engmech03 [2019/12/09 16:30]
hippysmack [Aftermarket Head Gaskets]
techtalk:ih:engmech03 [2019/12/09 16:58] (current)
hippysmack [Aftermarket Head Gaskets]
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 |  1969 Iron Heads ((photo by Monte03 of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=166440&​page=6)) ​ | |  1969 Iron Heads ((photo by Monte03 of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=166440&​page=6)) ​ |
  
-===== Aftermarket Head Gaskets ===== 
-Cometic MLS head gasket torque: 
-There are six torque values in sequence: 9-14-22-35-42-42 (all in ft/lb) \\ 
-When using aftermarket gaskets, it's important to note that the torque values in the FSM are for OEM gaskets. ((Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​p=5793537#​post5793537)) \\ 
-The OEM gaskets offer a squeeze factor unavailable with steel gaskets. \\ 
-When using the MLS torque specs, you'll find they are not that different from the FSM. \\ 
-For instance, after you get to 9 ft/bs, it's about a quarter turn to 14, then about a quarter turn to 22 and so forth. \\ 
-But using the actual values instead of counting turns gets a more even pull on all sides and allows you to feel when something isn't right. \\ 
- 
-To torque the heads, start with all four bolts loose and then snug them all by hand. Do one head at a time. \\ 
-Tighten in sequence 1-2-3-4 to 9 ft/lbs. Then do the entire sequence again to 14 ft/lbs and so on until you reach full torque. 
-Pay attention to how the bolts pull. They should not spring back when you let go after turning them. \\ 
-That would mean your bolts are stretching and would need to be replaced. \\ 
-That would also mean they loosened after you thought you had them to the right torque value. \\ 
-Do not use oil in the cap nuts (only a very light '​touch'​ on the bolt threads for smooth mesh of the mating threads. \\ 
-Using too much oil on the studs or cap nuts can hydrolock the nuts and you'll never get the proper torque. \\ 
-Hydrolock of the nuts stops the nut from turning on the stud threads and the only thing the stud can do when torqued from there is stretch (twist). \\