SERVICE MANUALCRANKSHAFT, MAIN BEARINGS, FLYWHEEL & CRANKCASESection 6The cast-in water-distribution passageway is plugged atthe rear of the case. A breather pipe aerates thecrankcase. The breather pipe is located below theexhaust manifold with the element inside the crankcase,on the “OLD” CRANKCASE MOUNTED ventilationsystem.However, the “NEW” VALVE COVER MOUNTEDventilation system aerates the crankcase and reduces oilcarry-over through the crankcase breather. The breatherelement, which requires service is located on the valvecover.400 Series Crankcase RevisionWith the introduction of the NEW 400 SERIES TAPPET(See Section 4), a new crank-case (IH P/N 1 802 330C1) with a 28.524 mm (1.1230 in.) tappet bore diameterhas been released into production and service re-placingthe old style crankcase (IH P/N 675 500 C4) with 25.400mm (1.0000 in.) tappet bore diameter. The newcrankcase can be identified by (IH Part No. 1 802 330C1) appearing on the right hand side of the crank-caseas shown in Figure 4.IMPORTANT: Some new crankcases (IH Part No. 1802 330 C1) with 1.1230 in. Tappet bores will haveold (IH Part No. 675 500 C4) Rev. w/cost on the side(Fig. 4). Identify 400 Series crankcase Revision byEngine Serial Number.Figure 4. - 400 Series Crankcase IdentificationEngineSerial No.DT414B155806 and aboveDT436B121623 and aboveDT466B140086 and aboveDT466C400001 and aboveIMPORTANT: The crankcase (IH Part No. 1 802 330C1) is a NON-SERVICE Part Number, to be used forIdentification only. Refer to appropriate partscatalog when ordering parts.400 Series Front and Intermediate Crankshaft UpperMain Bearing Insert Revision.A revised front and intermediate crankshaft upper mainbearing insert has been released with piston oil jet tubeholes (1, Figure 5) relocated to the center of the oilgroove (2, Figure 5). This change provides increasedload carrying capability of the bearing.The “Old Style” bearing insert with “Offset” piston oil jettube holes (Refer to Figure 21) drilled to align with pistonoil jet tubes may be intermixed with the “New Style”bearing insert. [Refer to Figure 20 to view “Old Style”Insert]. The “New Style” bearing insert is designed to beused WITHOUT changing the location of the piston oil jettubes in the main bearing. This is accomplished byproviding a large chamfer on the back side of the “NewStyle” bearing (3, Figure 5) which assures proper oil flowto piston oil jet tubes.Figure 5. - "New Style" Bearing InsertCGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 4
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