SERVICE MANUALVALVE TRAIN - CAMSHAFT, TAPPETS & PUSH RODSSection 4400 SERIES TAPPET REVISIONS WHICH OCCURREDIN PRODUCTIONI.REVISED 400 SERIES TAPPET WITHINCREASED DIAMETER (Refer to Fig. 7).The revised tappet measuring 28.4480/ 28.4353 mm(1.1200/1.1195 in.) has been released into productionand service for all 400 Series Diesel Engines. The newtappet provides improved tappet life. The followingchanges occurred to accommodate the larger tappet:• Introduce a revised camshaft with a wide camlobe and increased forging diameter (see Fig.6).• Introduce a revised crankcase by increasing thetappet bore diameter (see Section 6, Figure 4).400 SERIES CAMSHAFT REVISIONS WHICHOCCURRED IN PRODUCTIONI.Revised Intake Ramp HeightThe revised intake ramp height of the camshaftrequires the engine gear train timing adjustmentspecification and intake valve lash specificationbe changed.IMPORTANT: Refer to Section 3 for currentengine gear train timing and valve lashadjustment specifications and procedures.DISPLACED STYLE CAMSHAFT (IH Part No. 691488C1)**NON-SERVICEABLE PART NO.CG-7912Figure 6. - Camshaft IdentificationCGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 3
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