ENGINE 83 16.Also recheck run out of crank shaft. 17.Thoroughly clean crank shaft with kerosene. Use wire brush for cleaning oil holes NOTE It is essential to recheck crank shaft for cracks and balance after grinding. 18.Apply grease to all machined surfaces, if crank shaft is to be stored. Crank shaft must always be stored in vertical position. 19.Thoroughly clean main bearing caps and corresponding machined surfaces of crankcase. 20.Install main bearing caps without bearing shells in their respective positions on crankcase. NOTE Ensure that the serial numbers on crank case and main bearing caps are matching. Also caps are in order and notches forbearing shells are on same side. CYLINDER BLOCK 1. Check cylinder block for cracks by pressure testing method. Clean cylinder bores, bearing surfaces, oil passages in crank case thoroughly. Check water jackets for leakages by blowing air at a pressure of 5 bar and then dipping the cylinder block in the hot water (Temp of water 70°to 80°C) NOTE The block with any leakages / cracks should be discarded. 2. Check crankcase mating surface with cylinder head for unevenness with the help of straight edge and feeler gauge. If necessary grind this surface just to clear unevenness. Measure across the length and also across the breath. 3. Ensure that the minimum height of crank case is not less than the specified minimum height.
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