Connecting Rods and Pistons/Pistons and Connecting Rods CTM2 (19APR90) 30-13 16, 18, 20 & 24HP Onan Engines AllTractorManuals.com 130495 INSPECT PISTONS AND CONNECTING RODS 1. Measure crankshaft connecting rod journal diameter. Measure several places around each journal and each side of journal. -UN-29JAN90 NOTE: If engine has had previous major overhaul, crankshaft journals may have been ground and undersize connecting rods installed. M36390 CONNECTING ROD JOURNAL SPECIFICATIONS Item New Parts Wear Tolerance Journal O.D.
41.28—41.30 mm 41.25 mm (1.6252—1.6260 in.) (1.6242 in.) If journal diameter is less than 41.25 mm (1.6242 in.), replace crankshaft or have journals ground by a qualified machine shop. The following undersize connecting rods are available: 0.25 mm (0.010 in.) 0.50 mm (0.020 in.) 0.76 mm (0.030 in.) M98,2030K,21 -19-11NOV85 30 13