SERVICE MANUALCONNECTING RODS, PISTONS, RINGS & SLEEVESSection 5Figure 14. - Checking Piston Ring Gap1. Piston ring2. Feeler gauge3.Install new rings in the piston grooves with asuitable ring installing tool as shown in Fig. 15.a.The No. 1 (compression ring) will have theword “TOP” stamped on the ring.b.The No. 2 (intermediate ring) will bemarked “TOP”, “UP” or with a “PIP” onthe top side of the ring.Check TOP and INTERMEDIATE Piston compressionring groove widths for wear.Figure 15. - Installing Piston Ring using Piston RingExpander Tool1. Piston2. Piston Ring Expander ToolNOTE: A new piston groove wear measuring ToolNo. 3020 has been developed to accommodate thecomplex configurations of International Harvester’stechnologically advanced pistons.Tool Description: The Tool, No. 3020, consists of two.0900 in. gauge pins and two 0.1150 in. gauge pinsmounted on springs (Fig. 16). The .0900 in. gauge pinsare used to measure piston groove wear on pistons withhalf keystone INTERMEDIATE compression ringgrooves. The 0.1150 in. gauge pins are used tomeasure piston groove wear on pistons with full keystoneTOP or IN-TERMEDIATE compression ring grooves.The following checks are made to be sure that thecompression rings (keystone) fit are correct and notcarrying the piston load. If the measurement over gaugepins is not within specifications, replace old pistons andrings with new.CGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 16
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