SERVICE MANUAL CONNECTING RODS, PISTONS, RINGS & SLEEVES Section 5 SERVICE SPECIFICATION CHART FOR PISTON RING GROOVE WIDTHS TOP COMPRESSION RING GROOVE INTERMEDIATE COMPRESSION RING GROOVE Dimension Over Pins Dimension Over Pins Engine Piston P/N Groove Configuration Ga. Pin Dia. (in.) Upper Limit (in.) Replacemen t Limit (in.) Groove Configuration Ga. Pins Dia. (in.) Upper Limit (in.) Replacement Limit (in.) D-312 675 584 C1-C4 Full Keystone 0.1150 3.8898 3.8574 Rectangular ’ N/A N/A D-360 675 354 C1 & C2 Full Keystone 0.1150 3.8898 3.8574 Rectangular N/A N/A DT-360 677 003 C1 Full Keystone 0.1150 3.8898 3.8574 Rectangular N/A N/A D-414 671 543 C1 Full Keystone 0.1150 4.3118 4.2794 Rectangular N/A N/A D-436 675 775 C1 Full Keystone 0.1150 4.3118 4.2794 Rectangular * N/A N/A D-466 671 544 C1 Full Keystone 0.1150 4.3118 4.2794 Rectangular * N/A N/A DT-414 677 007 C1 Full Keystone 0.1150 4.3118 4.2794 Half Keystone 0.0900 4.3244 4.2793 DT-436 677 018 C1 Full Keystone 0.1150 4.3118 4.2794 Half Keystone 0.0900 4.3244 4.2793 DT-466 677020C1 Full Keystone 0.1150 4.3118 4.2794 Half Keystone 0.0900 4.3244 4.2793 DT-414 684251 C1 or C2 Full Keystone 0.1150 4.3118 4.2794 Full Keystone 0.1150 4.3168 4.2844 DT-414B 684 251 C2 Full Keystone 0.1150 4.3118 4.2794 Full Keystone 0.1150 4.3168 4.2844 DT-436 684 253 C1-C3 Full Keystone 0.1150 4.3118 4.2794 Full Keystone 0.1150 4.3168 4.2844 DT-436B 684 253 C3 Full Keystone 0.1150 4.3118 4.2794 Full Keystone 0.1150 4.3168 4.2844 DT-466 684255 C1 orC2 Full Keystone 0.1150 4.3118 4.2794 Full Keystone 0.1150 4.3168 4.2844 DT/DTI-466B 688 835 C1 or C2 Full Keystone 0.1150 4.3118 4.2794 Full Keystone 0.1150 4.3168 4.2844 DT/DTI-466C * Rectangular groove configuration does not utilize measurement over gauge pins. Use side clearance and ring gap dimensions as criteria for determining piston groove wear. N/A dimension over pins not applicable for pistons with rectangular groove configuration. DT-414, DT-436 & DT-466 (LATE MODELS) DT-414B, DT-436B, DT/DTI-466B & DT/DTI-466C Figure 18.  - Piston Ring Groove Configuration CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 19