Fig. F.1. Removing a Big End Bearing Cap

Fig. E.12. Adjusting Valve Clearance - TM-55-1930-209-14P-9-4_415

Fig. F.4. Numbering of Connecting Rods and Caps - TM-55-1930-209-14P-9-4_417

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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SECTION F Piston and Connecting Rods To Remove Pistons and Connecting Rod Assemblies 1. Remove the cylinder head (see Page E.1). 2. Remove the lubricating oil sump. 3. Turn the engine crankshaft until two big ends are at bottom center then remove the nuts from the big end bolts. 4. Remove the big end caps, bearing shells and big end bolts. Note: If the bearing shells removed are serviceable, care must be taken to refit them in their original positions. Fig. F.1. Removing a Big End Bearing Cap. 5. Push pistons and connecting rods out of the top of the cylinders (Refer Fig. F.2). 6. Turn the engine crankshaft until the next two big ends are at bottom center and repeat removal operations. Note: Carbon deposits around the top of the cylinder bores should be removed before Fig. F.2. Removing Piston and Connecting Rod Assembly from Cylinder Bore. attempting to remove the pistons. Keep each piston and connecting rod assembly separate, each to each as marked. To Remove Pistons and Rings from Connecting Rods 1. Remove the three compression rings and the two scraper rings from each piston. 2. Remove tile circlips retaining the gudgeon pin. using circlip pliers, and withdraw the gudgeon pin. If the gudgeon pin is tight in the piston bore, warm the piston in clean liquid to a temperature of 100/120F (40/50C) and the gudgeon pin will then he easily pushed out. Inspection 1. Thoroughly clean all the dismantled components. 2. Examine the pistons for scoring. Check the clearance of the piston rings in their respective ring grooves (see Technical Data).

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