Crankshaft, Main Bearings and Flywheel/Crankshaft MICRO-FINISHING SPECIFICATIONS The following specifications are required when cast iron crankshafts have to be reground: Center Line Average (C.L.A.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 micron (8 micro-in.) or better Skewness parameter (Sk) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Negative Bearing ratio (Tp) with 1% Tp reference line • 0.22 micron (8.8 micro-in.) depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tp more than 20 % • 0.38 micron (15.2 micro-in.) depth . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . Tp more than 80 % • 0.64 micron (25.6 micro-in.) depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tp more than 90 % Final journal finishing operation must be done in clockwise direction (as viewed from nose of crankshaft). IMPORTANT: DO NOT attempt to regrind cast iron crankshafts if above specifications cannot be obtained. CD,3274,G15,37 -19-01MAR92 CTM3274 (01JUL99) 15-24 Saran Liter Engines 060799 PN=121 CRANKSHAFT GEAR REPLACEMENT 1. Pull gear using a suitable commercial puller 2. Remove Woodruff key from crankshaft and remove any burrs from gear journal. -UN-13JUN95 3. Install a new Woodruff key in crankshaft keyway. 4.
Heat new gear to 180˚C (360˚F). N CAUTION: Oil fumes or oil can ignite above 190˚C (380˚F). Use a thermometer to ensure CD30439 that a temperature of 180˚C (360˚F) is not exceeded. Do not allow a flame or heating element to come into direct contact with the oil. Heat the oil in a well-ventilated area. Plan a safe handling procedure to avoid burns. 5. Drive gear onto crankshaft using JDG794A driver (formerly JDH7 or JDG794). -UN-10MAY95 NOTE: JDG794A driver must be used to install the gear while crankshaft is in place in engine block. CD30398 CD,3274,G15,22 -19-04JAN99 15 24