SERVICE MANUAL VALVE TRAIN - CAMSHAFT, TAPPETS & PUSH RODS Section 4 400 Series Valve Train Service Parts: The  400  Series  Engine  Valve  Train  Service  Package  is available for service on 400 Series Engines built PRIOR to  the  Tappet  and  Crankcase  Revisions  incorporated  in the following production engines: CHART I Engine Engine Serial Number D-414 Not Yet Available D-436 Not Yet Available D-466 Not Yet Available DT-414 and DT-414B 155 805 and Above DT-436 and DT-436B 131 623 and Above DT-466, DT-466B 140 086 and Above and DTI-466B DT-466C and DTI-466C 400001 and Above Installation of the Valve Train Service Package on engine built prior to Engine Serial Numbers listed in Chart 1 will provide  the  same  improved  valve  train  lubrication  and cam   lobe   and   tappet   durability   as   current   production engines.    For    convenience    in    servicing    the    subject engines, a Valve Train Service Package (IH Part No.  1 802  464  C91)  is  available.    In  addition  to  this  package, Camshaft   Service   Package   (IH   Part   No.      1   802   339 C92), which is the normal Camshaft Service Package for all   400   Series   Engines,   must   also   be   ordered.      ALL PARTS  IN  BOTH  PACKAGES  MUST  BE  USED  FOR ENGINES WITH ENGINE SERIAL NUMBERS BELOWTHOSE LISTED IN CHART 1. IMPORTANT THIS    IS    NOT    A    MANDATORY    CHANGE!    VALVE TRAIN    SERVICE    PARTS    ARE    AVAILABLE    FOR THOSE CUSTOMERS WHO OPT FOR SUCH CHANGES. VALVE TRAIN SERVICE PACKAGE IH PART NO.  1 802 464 C91 (Refer to Figure 8a) Part Number Description Quantity 1 802 461 C1 Rocker Arm Bracket Assembly 2 (For Cylinders No.  5 and No.  2) 1 802 462 C1 Rocker Arm Bracket Assembly 1 (For Cylinder No.  4) 259 070 C92 Valve Tappet* (with Tungsten wafer) 12 1 802 507 C1 Push Rod* (See NOTE) 12 EMD-914 Rocker Arm Bracket Installation Drawing 1 *Old Tappet (IH Part No.  911 776 R3) and Old Push Rod (IH Part No.  675 621 C1) are still available for service for those customers opting not to install the valve train service package. NOTE A short push rod (IH Part No.  1 802 507 C1) is required to accommodate Valve Tappet (IH Part No. 259 070 C92). CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 5