NMWR-9-2815-220 Overhaul Manual for M60 M88 Engine AVDS-1790-2CA, AVDS-1790-2DA, AVDS-1790-2DR Download
Page 201 of 1014
NMWR 9-2815-220 CYLINDER ASSEMBLY OVERHAUL—Continued 0012 00 REPAIR – Continued NOTE After new valve guides are installed, they must be reamed to specified size to assure proper valve stem clearance. (5) Install intake valve guide reamer bushing into intake valve seat as shown in (Figure 9). Use intake valve guide roughing hand reamer to rough ream the intake valve guide and intake valve guide finishing hand reamer to finish ream the intake valve guide as show in (Figures 9 and 10). The exhaust valve guides are similarly reamed using exhaust valve guide finishing hand reamer. INTAKE VALVE GUIDE HAND REAMER INTAKE VALVE INTAKE VALVE REAMER BUSHING GUIDE REF. CHARACTERISTIC INSP. REQUISITE LTR. METHOD A Inside diameter of Measure 0.5615 – 0.5625 in. exhaust valve guide (14.2621 – 14.2875 mm) installed into cylinder head B Inside diameter of Measure 0.4995 – 0.5005 in. intake valve guide (12.6873 – 12.7127 mm) installed into cylinder head Figure 9. Intake Valve Guide Hand Reamer Bushing Positioning in Cylinder Head – Sectional View. (b) Valve seats. Replace cylinder assembly when inserts are cracked, loose, or excessively worn. Grind seats which do not show all around (360°) contact with the valve face. Grind inserts (Figure 11) as described below. 0012 00-11 Change 1