Connecting Rods and Pistons/Specifications CTM2 (19APR90) 30-3 16, 18, 20 & 24HP Onan Engines AllTractorManuals.com 130495 PISTON Item New Specification Wear Tolerance 1. Ring Groove Width: Top Ring 2.032—2.057 mm 2.21 mm (0.080—0.081 in.) (0.087 in.) Second Ring 2.032—2.057 mm 2.21 mm (0.080—0.081 in.) (0.087 in.) Oil Ring 4.775—4.801 mm 4.95 mm (0.188—0.189 in.) (0.195 in.) 2. Ring End Gap 0.25—0.51 mm 1.52 mm (0.010—0.020 in.) (0.060 in.) 3. Piston Pin Bore I.D.: B43E, B43G, B48G, 17.468—17.478 mm P218G, P220G Engine (0.6877—0.6881 in.) T260 Engine 19.055—19.065 mm (0.7502—0.7506 in.) 4. Rod-to-Crankshaft 0.051—0.084 mm 0.13 mm Bearing Clearance (0.002—0.0033 in.) (0.0053 in.) 5.
Crankshaft Connecting 41.28—41.30 mm 41.25 mm Rod Journal O.D. (1.6252—1.6260 in.) (1.6242 in.) 6. Connecting Rod Crankshaft Bore I.D.: B43E, B43G, B48G, 41.35—41.36 mm 41.39 mm P218G, P220G Engine (1.6280—1.6285 in.) (1.6295 in.) T260 Engine 44.46—44.48 mm 44.50 mm (1.7505—1.7510 in.) (1.7520 in.) 7. Piston Pin O.D.: B43E, B43G, B48G, 17.463—17.468 mm 17.371 mm P218G, P220G Engine (0.6875—0.6877 in.) (0.6839 in.) T260 Engine 19.050—19.055 mm 18.959 mm (0.7500—0.7502 in.) (0.7464 in.) 8. Connecting Rod Piston Pin Bore I.D.: B43E, B43G, B48G, 17.470—17.480 mm P218G, P220G Engine (0.6878—0.6882 in.) T260 19.06—19.07 mm (0.7504—0.7508 in.) 9. Piston Pin Clearance:
B43E, B43G, B48G, 0.005—0.018 mm P218G, P220G Engine (0.0002—0.00007 in.) T260 Engine 0.005—0.020 mm (0.0002—0.0008 in.) M98,2030K,4 -19-11FEB87 30 3