CONNECTING ROD ASSEMBLY (CONT) - TM-5-4320-302-14

CONNECTING ROD ASSEMBLY (CONT) - TM-5-4320-302-14_527

REPAIR/REPLACEMENT - TM-5-4320-302-14_529

TM-5-4320-302-14 Forward Area Water Point Supply System (FAWPSS) Model WP55100 NSN 4320-01-168-1629 and Model 9095-91 NSN 4320-01-338-3305 Manual
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TM 5-4320-302-14 6-17. CONNECTING ROD ASSEMBLY (CONT) Location/Item Action Remarks NOTE When determining big-end bearing radial and side clearance, make sure connecting rods and big-end bearings are properly matched and also properly matched to the corresponding crankpin. 17.Big-end bearing radial Take the smallest measurement of the big-end clearance bearing bore that is still within the tolerance limits, measured in step 14, and subtract largest crankpin diameter measurement measured in step 16. The radial difference between these two measurements is the big-end bearing clearance. It should be 0.0020 to 0.0043 inch (0.05 to 0.108 mm) under normal conditions. Radial clearance upper limit value is 0.0118 inch (0.3 mm). If radial clearance is less than 0.0020 inch (0.05 mm), replace big-end bearing and remeasure bearing bore. Make sure radial clearance falls within tolerance limits. If radial clearance is larger than 0.0118 inch (0.3 mm), replace big end bearing with bearing having the next smaller size bore. 18. Big-end bearing side Measure crankpin width and record the measure- clearance ment. Subtract connecting rod width measured in step 11. The difference is big-end bearing side clearance and it should be 0.0067 to 0.0107 inch (0.170 to 0.271 mm) under normal conditions. The side clearance upper limit value is 0.0236 inch (0.6 mm). If the side clearance is less than 0.0067 (0.170 mm), the connecting rod should be rechecked and remeasured. Replace the connecting rod if necessary. If the side clearance is greater than 0.0236 inch (0.6 mm), either the connecting rod or the crankpin fillets on the crankshaft have worn. Recheck and remeasure connecting rod. Replace connecting rod if width is below tolerance limits. If not, recheck crankpin width on crankshaft. Crankpin width should be 1.3386 to 1.3401 inches (34.0 to 34.039 mm). If crankpin width is greater than 1.3401 inch (34.039 mm), replace crankshaft. Connecting rods and big- end bearings may also have to be replaced. 6-134

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