SERVICE MANUALCYLINDER HEAD & VALVESSection 3The cylinder head, cylinder head gasket and cylinderhead coolant directors have been revised for all 400Series Engines. The 12 coolant holes in the bottom deckof the cylinder head have been enlarged from 19.05 mm(.750 in.) to 23.80 mm (.937 in.) in diameter (Refer toFig. 5)Figure 5. - Cylinder Head Bottom Viewof Deck With Coolant Hole LocationsThe outer diameter of the press-fit coolant directors usedin these coolant holes has also been increased in sizefrom 19.15 mm (.754 in.) to 23.90 mm (.941 in.).The twelve cylinder head gasket coolant holes havebeen enlarged to accommodate the larger coolant holesize.IMPORTANT: The new style cylinder head gasket (IHPart No. 676 108 C2) and cylinder head gasketpackage (IH Part No. 674 398 C95) may be used witheither the old or new style cylinder head. The oldstyle cylinder head gasket (IH Part No. 676 108 C1)and cylinder head gasket package (IH Part No. 674398 C94) can only be use with the old style cylinderhead.The new style cylinder head can be identified by thecasting number (see chart) located on top of the cylinderhead at intake side between number four and five nozzlelocations (Refer to Figure 6).Figure 6. - Cylinder Head ProductionPart No. Location1.Number Four Nozzle Bore2.Casting Number Location3.Number Five Nozzle BoreCGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 3
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