杭州北京pk10靠谱刷水方案

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Kobelco Excavator Repair

Kobe Steel Excavator Hino J08 Engine Troubleshooting and Maintenance Methods (4)

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Detach the piston from the connecting rod. Use special tools to remove the piston ring. ! Caution • Piston rings are easily damaged. Be careful when handling them. • Identify and store the piston rings in the order of the cylinder numbers. • Be careful not to confuse the top and bottom of the piston ring during storage. (1) When mounting the piston on the connecting rod, note that the "O" mark on the piston and the alignment mark engraved on the connecting rod are in opposite directions. (2) Use elastic snap ring pliers to install a new retaining ring. ! Caution • Make sure that the retaining ring is not loose. Put the paint identification mark on the piston ring face up, and use special tools to install it in the order of oil ring, lower piston ring, upper piston ring. Reference • Only the lower piston ring has a paint identification mark, and there is no difference between the upper and lower piston rings. (4) Connect the oil ring to the coil seam of the coil expander, and put it into the ring. In addition, the seam of the coil expander and the opening of the ring are staggered 180 and installed. (5) As shown in the figure.

Divide the opening of the piston ring at equal intervals. Concave (1) As shown in the figure, the opening of the piston ring is equally divided at equal intervals. (2) Align the connecting rod bearing with the concave part of the connecting rod and install it. Oil hole bearing! Caution • Make sure that the oil hole on the connecting rod bearing is aligned with the oil hole on the connecting rod. SAPHSAPH applies engine oil to pistons, cylinder liners, and connecting rod bearings, and then uses special tools to compress the piston rings. ! Caution • Check that the piston ring holder (special tool) is not deformed or damaged. Insert the SAPH into the piston and be careful not to touch the engine oil nozzle during this process. ! Caution • Place the "O" mark of the piston on the exhaust side and insert it. • Set the crankshaft of the cylinder pad to the top dead center, and then install it. • Be careful not to touch the cylinder pads and the crankshaft and engine oil nozzles during operation. Align the connecting rod bearing with the recess of the connecting rod cover and install it. The alignment mark is aligned with the direction of the alignment mark marking of the connecting rod cover and the connecting rod, and is embedded by a positioning pin.

! Caution • Do not change the pairing of the connecting rod to the connecting rod cover. SAPH uses a vernier caliper to measure the length below the head of the connecting rod bolt. If it exceeds the limit of use, replace it with a new one. Apply engine oil to the thread of the connecting rod bolt and the joint surface below the length of the bolt head, and install it on the connecting rod. The connecting rod cover SAPH tightens the connecting rod bolts, and marks the heads of the bolts with paint in the same direction. Tightening torque: 69Nm {700kgfcmlbfft} to reinforce 90 connecting rod bolts. Further reinforce the 45 connecting rod bolt. Confirm that the marks are all in the same direction. ! Caution • When tightening the bolt, do not loosen it even if it is over-tightened. (1) Using an inside diameter dial gauge, measure the inside diameter of the sliding surface of the cylinder pad. 112 {4.4095} 112.15 {4.4153} Use a micrometer to measure the outer diameter of the piston. ! Caution • The measurement position is 23mm from the lower end of the piston up to the pin hole at right angles.

(3) Calculate the difference between the inner diameter of the cylinder head and the outer diameter of the piston. If it exceeds the standard value, replace the cylinder head and piston. (1) Use a micrometer to measure the width (size B) of the piston ring. If it exceeds the limit of use, replace the piston ring. SAPHSAPH uses a feeler gauge to measure the annular groove of the piston. If it exceeds the limit of use, replace the piston. (1) Using a piston, place the piston ring horizontally in the cylinder pad about 80mm. (2) Use a feeler gauge to measure the opening clearance of the piston ring. If it exceeds the limit of use, replace the piston ring. (1) Using a dial indicator, measure the outer diameter of the area where the piston pin contacts the piston hub. 37 {1.4567} 36.96 {1.4551} Use an inside diameter dial gauge to measure the inside diameter of the piston hub. (3) Calculate the difference between the outer diameter of the contact area between the piston and the piston hub and the inner diameter of the piston hub. If it exceeds the use limit, replace the piston pin or piston. JP. Disassembly of the connecting rod bush. Use wing nut (special tool) for fixing.

! Caution • Assemble the catheter with the "H" mark facing up. • Assemble on the water platform and make sure that the lower end of the duct and the press accessory are level. (2) Assemble the connecting rod with the large-end bearing removed, and then place it on the special tool installed. Install the main shaft (special tool) on the connecting rod bush. ! Caution • Align the groove of the press auxiliary with the groove of the main shaft (special tool), and install it. SAPH uses a press to remove the connecting rod bushing. ! Caution • Please operate the press slowly. SAPH, as shown in the figure, performs balanced edging on one side of the small end of the connecting rod. Edging! Attention • Thoroughly remove burrs. • After edging, remove the dirt on the inner surface of the small end and the oil hole. (1) Install the new bushing on the main shaft (special tool), and then install the conduit (special tool) and bolt (special tool). ! Caution • Align the conduit (special tool) with the groove of the main shaft (special tool) before mounting.

• Make sure that the end faces of the spindle (special tool) and the catheter (special tool) are in close contact. (2) Align the oil hole of the connecting rod with the oil hole of the bush on which the special tool is installed. The grooves on the) side are consistent. Groove! Caution • When placing the connecting rod, the oil hole bushing is on one side. • Apply engine oil to the inside diameter surface of the connecting rod. (3) Install the bush on the connecting rod using a press. SAPHSAPH inserts a 6mm diameter rod into the oil hole at the large end of the connecting rod to penetrate the oil hole at the small end of the connecting rod. Note • Misalignment of the oil hole may cause insufficient oil supply and cause pull cylinders and the like. (5) Insert a new piston ring and confirm that there is no blockage or looseness. (1) Remove the main bearing cap and the crankshaft bearing, and use a crane to remove the crankshaft. ! Caution • Because the crankshaft has a certain weight, handle it with care. • Identify and store the removed main bearing cap and crankshaft bearing in the order of the cylinder number. (1) Turn the grooved side (outside) of the thrust bearing toward the crank arm side;

The side (inside) with the model stamp is facing the main bearing cover side or the cylinder block side, and it is installed on the cylinder block and the main bearing cover. ! Caution • To prevent falling off during installation, apply engine oil or lubricant to the inside of the thrust bearing. (2) Install the main bearing on the cylinder block and each bearing cover. ! Caution • Install bearings with oil holes on the cylinder block side. • Apply engine oil to the sliding surfaces of each bearing. (3) Align the crankshaft with the cylinder block. The stamped number aligns the main bearing cap with thrust and main bearings on the cylinder block. ! Caution • The pentagonal markings of the main bearing cap are facing forward of the engine, and aligned in the order starting from the front. • Compare the steel stamp number of each main bearing cover with the steel stamp number of the cylinder block. Steel-printed SAPH uses a vernier caliper to measure the length below the head of the bearing cap bolt. If it exceeds the limit of use, replace it with a new one. The SAPH paint mark on the front of the engine tightens the bearing cap bolts in the order shown in the figure.

(8) Loosen the bearing cover where the thrust bearing is installed, and then tap lightly from the front and rear ends of the crankshaft with a plastic hammer. (9) Loosen all bearing cap bolts. Tighten the bearing cap bolts according to the same requirements as (7). Tightening torque: 69Nm {700kgfcmlbfft} mark the head of the bearing cap bolt with oil marks in the same direction. (12) Tighten 90 (1/4 turn) in the same order as in (7). Then follow the same sequence as in (7) and reinforce it by 45 (1/8 turn). Confirm that the imprint marks are in the same direction. ! Caution • At this time, do not loosen even if you over-tighten. 之后 After the fastening is completed, tap the front and rear ends of the crankshaft with a plastic hammer to fully cooperate. ! Caution • Make sure the crankshaft rotates smoothly. • Measure the axial clearance of the crankshaft to confirm that it is within the standard value range. (1) Use a dial indicator to measure the axial clearance of the crankshaft. If the repair limit is exceeded, replace the thrust bearing. In addition, if it exceeds the limit of use.

Replace the crankshaft. (1) Use a dial indicator to measure the rotation and swing of the crankshaft. If the repair limit is exceeded, grind the crankshaft and use a bearing with a lower limit size. Use a micrometer to measure at two places, and measure the outer diameter of the crankshaft bearing neck. If there is any problem, grind or replace the crankshaft. If the crankshaft is ground, use a bearing with a lower limit. The SAPH operation legend uses a vernier caliper to measure the width of the central journal portion of the crankshaft. If the use limit is used, the crankshaft is replaced. (1) Using a micrometer, measure the outer diameter of the neck position of the crankshaft bearing. SAPH SAPH installs the crankshaft bearing and main bearing cap on the cylinder block without mounting the crankshaft. (3) Use an inside diameter dial gauge to measure the inside diameter of the crankshaft bearing. (4) Calculate the difference between the outer diameter of the neck of the crankshaft bearing and the inner diameter of the crankshaft bearing. If it exceeds the repair limit, grind the crankshaft and use the lower limit size bearing. • Lower limit size bearing value: 0.0.0.1.00.


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