1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 437Get this manual

1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 437

CYLINDER HEAD and VALVE RECONDITIONING n 608090" nditi cylinder head and val mechani signi fica ntl de erminc pOI,'er, performa
'alve breakageInsufficie nt clearance u:ill re ult in noisy and sticky valves and rough engtne operation5Ch eck ind ividua
in ta ke and ex haust valve pnn gs under free lengt1 and under load len tho len th listed In engme specific tionsec tion
8) for checks NO T: {f spark plug hole thread is stripped, in tall 14mm heli-coil insert (C -92-45831) in cylinder head hole01747
Figure 1Removing Valves ompres5 vatv prings I'ith Iv prill' mpressor and remove alve keys , T: Intak and exhaust vah'e keys
ar not identical and must not be mixed 3fl lease sp ing comp re ssor and remove pri ng caps, 'al'e springs nd base wash (Figure
2) Remove Ive rom bott of "Iinder head and place val'es in rack in correct quence for assembly in or iginal pos itions 5Remove
va Lappe tsCLEANING Figure 2Cy li nder Head lat Surface RECON DITIONING REPLACI VALVE GU IDE 1P osi ion cy linder head on