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TM5-4210-229-14&P 6-12.  PISTON AND CONNECTING ROD MAINTENANCE (Continued). (2) Clean all carbon from the piston ring grooves; using a nonmetallic brush.  Be sure all oil holes in the piston are open. (3) Visually inspect the pistons for scuffed or scored skirts and cracked or worn piston ring lands.  Replace the piston if necessary. (4) Check running clearance between the pis- ton and cylinder sleeve (with piston rings removed) for piston skirt wear.  Measure at the largest piston diameter.  If running clearance exceeds 0.0065 in (0.165 mm) replace the piston. (5) Visually inspect the piston pins for wear. Replace any pins which show signs of corro- sion or etching. CAUTION Faulty rings cannot always be detected by the eye.  Therefore, whenever a piston is removed from a cylinder, it is recommended that the piston rings be replaced. (6) Visually inspect new rings for any signs of damage prior to installation. (7) Proper ring gap check. (a) Push the ring down into a new cylinder sleeve with a piston.  (This will position the ring squarely in the sleeve). (b) Measure the gap between the ends of the ring with a feeler gauge. (c) Ring gaps should be 0.016 to 0.29 in (0.41 to 0.74 mm).  If ring gaps are not within limits, replace the rings. (8) Install new rings in the piston grooves with a suitable ring installing tool. NOTE The number 1 (compression ring) will have the word top stamped on the ring. The number 2 (intermediate ring) will be marked top, up, or with a pip on the top side of the ring. (9) Inspect the windows of the oil regulating rings for blocked oilways. CAUTION Failure to keep the oilways clear will result in uneven lubrication of the piston and sleeve. (10) All rings must fit loosely in the piston ring grooves without binding. (11) Ring bearing surfaces must be of a smooth satin like finish with no burrs.  Visually in- spect new.  rings, prior to installation, for burrs. CAUTION When new rings are being installed on a used piston for operation in a used sleeve, wear on the sleeve may have left a ridge where the pis- ton reaches the top of its stroke.  This ridge will cause noisy engine operation and breakage of the top ring.  Remedy this by removing the ridge before installing the piston ring. d.  Cylinder sleeves inspection. (1) Using a soap solution clean the cylinder sleeves with minimally abrasive brush. (2) Thoroughly clean the O-ring groove in the sleeves. 6-32

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