Quantcast Table 5-7.  Connecting Rod Bore (Without Bearing Inserts) Specifications - TM-9-2815-260-24_258

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ARMY TM 9-2815-260-24 AIR FORCE TO 38G1-126-2 MARINE CORPS TM 09244A/09245A-24 5-78 4 Measure and record assembled rod bearing inner diameter.  Compare assembled rod bearing inner diameter with specifications given in Table 5-6.  Replace bearings (3 and 6) if out of specifications. 5 Subtract crankshaft journal outer diameter from rod bearing inner diameter to determine oil clearance.  Compare oil clearance calculations with specifications given in Table 5-6.  Replace bearings (3 and 6), connecting rod (5) or crankshaft (7, Figure 5-67) as required if out of specifications. 6 Remove capscrews (1, Figure 5-72), cap (2), and bearings (3 and 6). 7 Inspect connecting rod (5) and cap (2) for wear or damage, such as chips or cracks in the joint area.  Inspect in and around capscrew (1) holes in cap.   Replace connecting rod and cap if any imperfections are found. NOTE Assemble rod and cap without bearings installed. 8 Assemble connecting rod (5) and cap (2) using old capscrews (1).  Torque capscrews to 43 lb-ft (58 Nm).  Tighten capscrews an additional 90 degrees (1/4 turn). 9 Measure and record assembled connecting rod bore inner diameter at center of bore as follows: a At right angle to connecting rod-to-cap joint. b At 45 degrees left of measurement step a. c At 45 degrees right of measurement step a. (i) Compare connecting rod bore inner diameter with specifications given in Table 5-7.   Replace connecting rod (5) and cap (2) if out of specifications. Table 5-7.  Connecting Rod Bore (Without Bearing Inserts) Specifications. Item Specification Rod Bore ID 3.2550 - 3.2560 in. (82.677 - 82.703 mm) Maximum Permissible Bore Out-of- Round 0.0015 in. (0.038 mm) (j) Subtract smallest rod bore inner diameter measurement from largest rod bore inner diameter measurement.  This is the maximum bore out-of-round measurement.  Replace connecting rod (5) and cap (2) if maximum bore out-of-round measurement exceeds specifications given in Table 5-7. (k) Measure connecting rod (5) piston pin bushing (10) inner diameter and compare with specifications given in Table 5-8.  Replace connecting rod piston pin bushing if out of specifications, refer to step m.


 


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