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Tool Talk Discussion Forum

Re: cylinder head

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Author  [Modern View]
dr sportster

05-31-2014 09:58:56
68.192.202.137



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Another thing when you install the guides the holes will reduce even more than when measured before installation. You will then have to ream them to clearance for the valve stem diameters. If you go to a shop they will more likely hone them to size and they will cut the seats on a modern Serdi machine [ or Sunnen.] The way to find the size of the hole in the guides is with the pilots for the valve work. If you don't have a set of pilots you will have difficulty with a small snap gauge and mike. The pilot is reality. The seats widths must be cut to the specs in the service manual [ too wide they overheat ,too narrow they overheat] and the clearance between guide and valve stem must be correct [especially for the exhaust stems/ guides] Otherwise the stem will hang in the guide and then the pistom may strike the valve head bending the valve [overhead valve engine].The cause could be either too tight guide clearance or wrong seat width causing swollen overheated stems closing up clearance on the stem. Back to square one. Whatever money you pay a competent machinist is well spent unless you are equipped for the job and the price charged is fairly reasonable for the work.

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