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techtalk:ih:engmech02 [2019/12/09 16:08]
hippysmack [Gearcase Cover]
techtalk:ih:engmech02 [2020/06/20 21:36] (current)
hippysmack [Tappets (Lifters)]
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   * Reports were received indicating that tumbling stone contamination may have been existent in Late 1982 - Early 1983 engines with crankcase VINs (782025001-783200001). Tumbling stones are used in the polishing process of tappet bodies and occasionally can become wedged within the tappet body. The retention of a tumbling stone in the tappet assembly will cause premature tappet wear. If contamination has occurred ​ and tumbling stone material is allowed to circulate through the engine for an extended period of time, some engine damage will eventually occur. Affected engines will first show excessive wear of one tappet guide assembly. ((HD Service Bulletin #M-857 dated October 5, 1982))   * Reports were received indicating that tumbling stone contamination may have been existent in Late 1982 - Early 1983 engines with crankcase VINs (782025001-783200001). Tumbling stones are used in the polishing process of tappet bodies and occasionally can become wedged within the tappet body. The retention of a tumbling stone in the tappet assembly will cause premature tappet wear. If contamination has occurred ​ and tumbling stone material is allowed to circulate through the engine for an extended period of time, some engine damage will eventually occur. Affected engines will first show excessive wear of one tappet guide assembly. ((HD Service Bulletin #M-857 dated October 5, 1982))
  
 +====== Installing Tappets ======
 +When installing the tappets, the valve may be recessed in the head a bit. ((Iron Mick of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2077007&​page=2)) \\
 +You can gently lever up on the pushrod to allow it to pop in the tappet cup. \\
 +Just be sure you have some free play remaining once it is in the cup and before clearance is adjusted. \\
 +An open end wrench will work, or carefully with a pair of smooth sided needle nose pliers. \\
 +You just need to overcome some valve spring pressure. \\
  
  
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