Fig. H.1. Removing a Main Bearing Cap - TM-55-1930-209-14P-9-4

Fig. G.3. Checking Cylinder Liner Protrusion above top face of Cylinder Block - TM-55-1930-209-14P-9-4_421

Fig. H.3. View of Crankcase showing Serial Numbers and Identification Numbers - TM-55-1930-209-14P-9-4_423

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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SECTION H Crankshaft and Main Bearings CRANKSHAFT AND MAIN BEARINGS The crankshaft runs in fi ve pre-finished replaceable shell bearings lined with aluminum tin. Crankshaft end float is controlled by four thrust washers which are located on both sides of the center main bearing housing. 0.0075 in (0,19 mm) oversize thrust washers are available which may he combined with standard thrust washers to give an adjustment of 0.0075 in (0.19 mm) or when used on both sides of the bearing housing, give an adjustment of 0.(15 in (0.,38 mm). The main bearings are located in position by tabs fitting into slots machined in the bearing housings. Note: Main bearing cap setscrew tabwashers have been deleted on later engines. It is therefore no longer necessary to replace these tabwashers when fitting main hearing cap setscrews. The tightening torque for these setscrews remains unchanged. To Remove Main Bearings and Thrust Washers Under normal circumstances, by the time the main bearings, require renewing the crankshaft will need to be removed for regrinding. However, Fig. H.1. Removing a Main Bearing Cap. Fig. H.2 Removing a Main Rearing Shell with the Crankshaft "in situ.” removal of main bearing and thrust washers can he carried out without withdrawn the crankshaft. Proceed as follows : — 1. Remove the sump. sump strainer and the oil pump suction and delivery pipes (see page L.3). 2. Remove the two setscrews securing the main bearing cap. Only remove one bearing cap at a time. 3. Slacken the setscrews on the remaining bearing caps. To gain access to the rear main bearing setscrews, the rear main bearing bridge piece must be removed. This is secured by two recessed setscrews to the cylinder block and the two lower rear main oil seal housing securing setscrews. Access to the front main bearing setscrews can be achieved by removing the lubricating oil pump (see Page L.3). 4. Remove the lower half of the bearing from the bearing cap and with a suitable piece of thin hard wood push out the top half of the bearing by rotating it on the crankshaft, apply the wooden strip to the opposite side

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