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TROUBLESHOOTING engine , and their methods .Chast 3.

-------------------------------------------------- ------- knock the pistons -------------------------------------------------- ------- Knock the pistons nezvonky, muffled sound, listening to low engine speeds the engine and under the load. It comes from the "beats" of the piston in the cylinder -------------------------------------------------- ------- 1. Excessive clearance between the pistons and cylinders .......... ............ Replace the piston if necessary, replace sleeve -------------------------------------------------- ------- 2. Excessive clearance between the piston rings and related grooves on the piston ...................................... ............ Disassemble and check the piston ring grooves on the piston and make the necessary change -------------------------------------------------- ------- knock piston pins -------------------------------------------------- ------- Knocking piston pin features dual metal sharp sound that is best heard at idle Engine -------------------------------------------------- ------- 1. Excessive clearance between the finger and the holes in the lug piston ................................................. .. ............ Put the piston pins of larger diameter wasted rod bushing respectively -------------------------------------------------- ------- 2. Excessive clearance between the finger and rod bushing ....... ............ Zapressuyte on the head of the connecting rod bushing new and to the right diameter bore -------------------------------------------------- ------- Knocking intake and exhaust valves -------------------------------------------------- ------- Knocking the intake and exhaust valves are at work engine with incorrectly adjusted valve clearances to and is characterized by a sound at regular intervals. Frequency sound is usually less than any other in the engine, so as valves driven by the camshaft, the frequency rotation which is half the speed the engine crankshaft. -------------------------------------------------- ------- 1. Excessive clearance between the valve stem and the end of the tip Valve ................................................. . ............. Adjust the gap to the recommended values -------------------------------------------------- ------- 2. Faulty valve springs ............................. ............. replace the springs -------------------------------------------------- ------- 3. Excessive clearance between the valve stem and guide bush ................................................. . ............. Check the diameter of the valve stem and inner nnapravlyayuschey diameter bushings, replace worn parts -------------------------------------------------- ------- 4. Excessive wear of one or more cams camshaft .................................. ............. Replace the camshaft -------------------------------------------------- ------- Excessive noise chain camshaft drive -------------------------------------------------- ------- Of the total noise of the engine noise of a chain drive Camshaft clearly audible at low speed -------------------------------------------------- ------- 1. Reduce chain tension due to its normal depreciation ................................................. ... .............. Make the chain tension -------------------------------------------------- ------- 2. Excessive wear in chain .................................. .............. Replace the circuit -------------------------------------------------- ------- Vibration Motor -------------------------------------------------- ------- 1. Defects in the ignition system ........................... .............. Inspect and test ignition system -------------------------------------------------- ------- 2. Defects in the carburetor ................................... .............. Check and clean the jets and domestic valves, adjust the idling system -------------------------------------------------- ------- 3. Imbalance crankshaft ............................ .............. Remove and Balance the crankshaft -------------------------------------------------- ------- 4. The pistons of different weight ................................ .............. Disassemble the connecting rod group - the plunger, remove the difference between the mass of pistons -------------------------------------------------- ------- 5. Uneven gaps in valves .................... .............. Adjust the gap to the required value -------------------------------------------------- ------- 6. Cushion engine mounts are worn out or too tough ... .............. Replace the pads -------------------------------------------------- ------- Insufficient oil pressure -------------------------------------------------- ------- 1. Work at an inappropriate oil ..................... .............. Change the oil -------------------------------------------------- ------- 2. Malfunction of oil pump relief valve ... .............. Adjust or replace pressure-reducing valve -------------------------------------------------- ------- 3. Worn or defective oil pump gears ............ .............. Repair oil pump -------------------------------------------------- ------- 4. Excessive clearance between the main and connecting rod journals and appropriate inserts .............................. .............. Remove the engine crankshaft, inspect and measure the ear and neck of the shaft, if necessary, proshlifuyte neck and replace liners -------------------------------------------------- ------- 5. Faulty oil pressure indicator ................ .............. Check and, if necessary, replace xindex -------------------------------------------------- ------- Excessive oil pressure -------------------------------------------------- ------- 1. Work at an inappropriate oil ..................... .............. Change the oil -------------------------------------------------- ------- 2. Malfunction of oil pump relief valve ... .............. Replace the pressure reducing valve -------------------------------------------------- ------- 3. Contamination of lubrication oil line ............ .............. Wash the engine lubrication system -------------------------------------------------- -------
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