COMPRESSIONValve Guides & Seat InsertsFig. 10Repairing Worn Aluminum or Sintered Iron GuidesPlace piloted counterbore reamer, 19231, into wornguide. Slide reamer guide, 19234, down shank of 19231and center on valve seat, Fig. 9, Illus. 2. Place bushing231218 next to reamer on reamer guide, Fig. 9, Illus. 2,and mark reamer 1/16" (1.6 mm) above bushing.Use Stanisol or kerosene to lubricate reamer whileturning clockwise. Continue reaming until mark onreamer is flush with top of reamer guide bushing, 1-1/32"(26.19 mm), Fig. 9, Illus. 3.Installing Replacement BushingClean out all chips. Place grooved end of servicebushing, 231218, into valve guide, Fig. 9, Illus. 4. Usebushing driver, 19204, to press bushing into guide untilflush with top of guide or until it bottoms. Place reamerguide bushing, 19234, on valve seat and slide finishreamer, 19233, thru center of bushing. Fig. 9, Illus. 5.Use Stanisol or kerosene as lubricant while turningreamer clockwise. Continue reaming until reamer enterstappet chamber. After reaming is done, continue to turnreamer clockwise while removing. Clean out all chipsbefore reassembling engine.Repairing Worn Valve Guides Using 19183 Reamerand Reamer Guide Bushing 19192Place piloted counterbore reamer, 19183 into wornguide. Slide reamer guide bushing, 19192, down shankof reamer and center in valve seat, Fig. 9, Illus. 2. Slidereplacement bushing, 230655, next to reamer shank onreamer guide bushing. Mark reamer 1/16" (1.6 mm)above bushing Fig. 9, Illus. 3. Use Stanisol or keroseneto lubricate reamer while turning clockwise. Continuereaming until mark on reamer is flush with top ofbushing. DO NOT REAM THROUGH THE WHOLEGUIDE. Continue to turn reamer clockwise whilewithdrawing reamer.Installing Replacement Bushing 230655Clean out all chips. Press in valve guide bushing,230655, using bushing driver, 19204, until flush with topof guide or until it bottoms. Fig. 9, Illus. 4. The bushing230655 is finish reamed to size at the factory, no furtherreaming is necessary, and a standard valve can be used.NOTE: Cast iron engines use sintered (gray colored)valve guide bushings. DO NOT REMOVE THESEBUSHINGS. See reaming valve guide (230655 or231218 bushing) to install service brass bushings.CAUTIONValve seating should be checked after bushing theguide, and corrected if necessary by refacing the seat.Valve Seat InsertsCast iron cylinder engines are equipped with an l exhaustvalve seat insert which can be removed and a new insertinstalled. The intake side must be counterbored to allowinstallation of an intake valve seat insert. Fig. 12, 13 &14.Fig. 12 - Inserting Cutter Shank5
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