CLEANING AND INSPECTION OF PARTS

TM-5-3805-260-24 Scraper Tractor: Elevating Self-Propelled 11 Cubic Yard Sectionalized and Nonsectionalized Manual
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TM 5-3805-260-24 CLEANING AND INSPECTION OF PARTS CLEANING All parts should be cleaned thoroughly in a good cleaning solvent before inspection. CYLINDER HEAD ASSEMBLY Remove all carbon deposits from discharge cavities and all rust and scale from cooling cavities of cylinder head body. Scrape all foreign matter from body surfaces and use air pressure to blow dirt particles from all cavities. Discharge valves can be dressed by lapping them on a piece of fine crocus cloth on a flat surface, provided they are not excessively worn. CYLINDER BLOCK Clean carbon and dirt from inlet and unloader passages. Use air pressure to blow carbon and dirt deposits from unloader passages. Inlet valves, as in the case of discharge valves, not worn excessively, can be cleaned by lapping them on a piece of fine crocus cloth on a flat surface. OIL PASSAGE Clean thoroughly all oil passages through crankshaft, connecting rods, crankcase and end covers. If necessary inspect passages with a wire and blow foreign matter out with air pressure. INSPECTION OF PARTS CYLINDER HEAD BODY Inspect cylinder head body for cracks or damage. DISCHARGE VALVES AND SEATS If discharge valves are worn and grooved where they contact the seats, they should be replaced. If the discharge valve seats are worn excessively so that there is no longer enough metal left to reclaim them by lapping, the seats should be replaced. DISCHARGE VALVE SPRING AND CAP NUTS Replace all used discharge valve springs and cap nuts. CRANKCASE AND END COVERS Check for cracks or broken lugs in crankcase and end covers. Also check their oil passages to make sure they are open and clean Check the crankshaft sleeve bearing in the rear end cover for excessive wear and flat spots and replace if necessary. CYLINDER BLOCK Check for cracks or broken lugs on cylinder block. Also check unloader bore bushings to be sure they are not worn, rusted or damaged. If these bushings are to be replaced they can be removed by running a 1/8 in. pipe thread tap inside the bushing, then inserting a 1/8 in. pipe threaded rod and pulling the bushing straight up and out. Do not use an easy-out for removing these bushings. INLET VALVES AND SEATS If inlet valves are grooved or worn where they contact the seat, they should be replaced. If the inlet valve seats are worn or damaged so they cannot be reclaimed by facing, they should be replaced. MEASURING CYLINDER BORES CYLINDER BORES Cylinder bores which are scored or out of round by more than 0. 002 in. or tapered more than 0. 003 in. should be rebored or honed oversize. Oversize pistons are available in 0. 010, 0. 020, and 0. 030 oversizes. Cylinder bores must be smooth, straight, and round. Clearance between cast iron pistons and cylinder bores should be between 0. 002 in. minimum and 0. 004 in. maximum (Fig. 20). 3-19

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