Chapter12Reconditioningvalve

Chapter12Reconditioningvalve - Reconditioning valve train...

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Reconditioning valve train components Knurling valve guides Mostly for integral guides Use wear limit of .004” (Use Go/No-Go) Fixed arbor or roller For correcting worn guides Copyright 2003 Gary Lewis – Dave Capitolo
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Reconditioning valve train components Fixed arbor knurling Cold forming tap with pilot Produces a thread by deforming metal inward Threads are formed, not cut
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Reconditioning valve train components Fixed arbor knurling Standard domestic knurls are 5/16”, 11/32”, & 3/8” Reamers are sized by thousandths of an inch
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Reconditioning valve train components Knurling procedure Use extreme pressure lubrication In guide/seat machine or with speed reduction drill Clockwise direction only
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Reconditioning valve train components Knurling precautions A 3/8” knurl will start in an 11/32” guide Removable guides may break Once knurl is started, don’t stop
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Reconditioning valve train components Reaming Increases inside diameter to proper clearance Pilot keeps reamer straight Clockwise direction only Shallow groove left in guide for longevity
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Reconditioning valve train components Reaming procedure Continuous flow of coolant to flush chips Select reamer Stem diameter + clearance When done, reamer should fall out of guide Counterclockwise rotation dulls reamer
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Reconditioning valve train components Measuring knurled & reamed guides Measure knurled guides with bore gauge. Probe will span grooves Set gauge to stem diameter & read clearance
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Reconditioning valve train components Roller knurling Single roller used to knurl guide Continuous flow of oil Diamond hone used to finish guide
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Reconditioning valve train components Replacing guides Aluminum heads & some iron heads Usually removed & installed from port side Measure height above spring seat Heat head to 250ºF & add oil around guide
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Reconditioning valve train components Replacing guides Tap guide & install cap screw to remove Use cap screw technique for bronze guides Core drill to create shoulder to drive on
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Reconditioning valve train components Replacing guides Before installation, measure! Heat head, oil guide & head Install to specified height
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Reconditioning valve train components Oversized valve stems For correcting wear in integral guides Sizes include .003”, .005”, .010”, & .015” oversize Engine manufacturers recommend oversize stems Economical when guides are worn Reaming is done incrementally
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Reconditioning valve train components Replacing integral guides Valve guide bushing (false guides) Allows for upgrading material to bronze 5/16” guides 7/16” OD 11/32” guides 1/2” OD 3/8” guides 1/2” OD Replacement guides provide .0015” interference
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Reconditioning valve train components Replacing integral guides Precision level is used to align guide to spindle Level the guide in two directions Core drill to within .025” of replacement guide
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