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Check John Deere John Deere Diesel Engine Piston Pins and Bushings
1. Visually inspect the piston pin. The piston pin must be intact and without significant wear.
Important: Do not attempt to sand or trim the surface of the piston pin. The surface of the piston pin requires high finish.
2. Soak the piston pin in clean engine oil.
3. Install the piston pin (A) on the piston. With a light press of the thumb, the piston pin can penetrate into the piston.
4. Piston pins can be inserted from both sides. If the piston pin can be inserted freely, but is stuck in the center, the hole may be tapered (B).
5. Insert the piston pin to check that the pin hole (C) is aligned. The piston pin should not make a "click" sound, nor need it be forced into the hole against the other end.
6. Measure the outer diameter of the piston pin. If it does not meet the technical specifications, it should be replaced.
Piston Pin (Small)-Outer Diameter ... 34.920-34.930 mm (1.3748-1.3752 inches)
Wear limit ... 34.907 mm (1.3743 inches)
Piston Pin (Large)-Outer Diameter .. 41.270-41.280 mm (1.6248-1.6252 inches)
Wear limit ... 41.257 mm (1.6243 inches)
Piston Pins-Length ... 71.51-72.11 mm (2.815-2.839 inches)
C-pin hole collimation
Note: There are oil holes in the straight link, but not in the tapered link.
7. The lubrication holes must be opened.
8. Measure the inner diameter of the piston pin bushing and compare it with the outer diameter of the piston pin to determine the oil gap.
Installed piston pin
Bushing (Small Pin)-Inner Diameter... 34.950-34.976 mm (1.3760-1.3770 inches)
Wear limit ... 35.026 mm (1.3790 inches)
Installed Piston Pin Bushing (Large Pin)-Inner Diameter... 41.300-41.326 mm (1.6260-1.6270 inches)
Minimum wear limit ... 41.376 mm (1.6290 inches)
Piston pin to bushing-oil gap... 0.020-0.056 mm (0.0008-0.0022 inch)
Wear limit 0.102 mm (0.0040 inch)
9. Insert the piston pin from either end of the connecting rod bush. If the piston pin can be inserted freely at one end, but is stuck at the other end, the hole may become tapered (A). If the piston pin can be inserted freely at both ends of the hole, but is stuck in the middle, it indicates that the hole has formed a bell mouth (B).
John Deere John Deere Diesel Engine Removes Piston Pin Bushing
Remove the piston pin bushing on the connecting rod end of the straight pin
When removing the bushing, use a JD286 (JD-286) 1 piston pin bushing remover for 41 mm (1.6 inch) piston pins; use a JDE88 piston pin bushing remover for 35 mm (1.3 inch) piston pins.
Remove the piston pin bushing on the rod end of the taper pin
1. Use the JDG953-1 disassembler (A) and JDG953-2 receiver cup (B) of the JDG953 connecting rod bushing maintenance kit to remove the taper pin connecting rod
2. Slide the disassembler into the connecting rod bushing from one end. Turn the disassembler until the flange conical surface of the disassembler completely matches the conical surface of the bushing.
3. Install the receiving cup at the other end of the connecting rod bush.
Note: The pins in the receiving cup keep the connecting rod in the correct position of the cup. IMPORTANT: If the bushings are severely worn, the remover may come into contact with the inner surface of the connecting rod hole. Be careful not to damage the connecting rod holes.
4. Press the bushing out of the connecting rod with a hydraulic press until the disassembler and the bushing fall into the receiving cup together.
5. Clean, inspect, and measure the inside diameter of the connecting rod pin hole as described later in this chapter.
Cleaning and checking the connecting rod pin holes
1. Clean the connecting rod holes with a medium-sized abrasive cloth.
2. Inspect the connecting rod hole for breakage or other damage. The oil hole on the top of the straight pin connecting rod must be open.
Important note: If the bushings rotate in the connecting rod, the connecting rod should be replaced.
3. Measure the aperture at two positions 90 ° apart. If the specifications are not met, the connecting rod should be replaced.
Small connecting rod pin (with bushing removed)-inside diameter... 38.087-38.113 mm (1.4995-1.5005 in.)
Large connecting rod pin (with bushing removed)-inside diameter ..... 46.025-46.051 mm (1.8120-1.8130 inches)
Install John Deere John Deere diesel engine connecting rod piston pin bushing
Carefully file a small chamfer at the edge of the connecting rod pin hole. Sand all burrs and edges on the edges of the bushing holes.
Note: There is no oil hole in the connecting rod and bushing at the end of the taper pin connecting rod. Method for installing piston pin bushing on connecting rod end of tapered shank pin
Note: The JDG953 connecting rod bushing maintenance tool kit includes JDG953-1, JDG953-2, and JDG738-2.
1. Slide the bushing (A) into the JDG953-1 disassembler (B) and slide the JDG738-
2 Install the retaining ring (C) on the disassembler O-ring side. Apply clean engine oil or grease to the outer diameter of the new bushing, the outer diameter of the locating ring, and the inner diameter of the connecting rod pin hole. 2. The disassembler is installed on the connecting rod pin hole, so that the positioning ring is positioned in the connecting rod hole.
3. JDG953-2 receiving cup (D) is installed on the side opposite to the connecting rod.
4. Press the bushing into the connecting rod hole until the edge of the bushing is flush with or slightly lower than the surface of the connecting rod.
5. If necessary, a new bush can be customized in a professional workshop to make the oil gap between the bush and the piston pin meet the specified requirements.
Connecting rod pin to bushing (tapered shank pin)-oil gap.......
John Deere John Deere Strong Deer Diesel Engine Straight Pin Connecting Rod Piston Pin Bushing
Important: The oil holes (A) must be aligned. If the oil holes are misaligned, the bushings should be removed and discarded. Install a new bushing. Bushes must not be reused. Fit the bushing into the connecting rod.
1. When installing the bushing, use a JD286 (JD-286) 1 piston pin bushing remover for 41 mm (1.6 inch) piston pins; use a JDE88 piston pin bushing remover for 35 mm (1.3 inch) piston pins .
2. Press the bushing into the connecting rod hole until the edge of the bushing is flush with or slightly lower than the machining surface of the connecting rod.
3. Remove the connecting rod from the press.
4. The inner diameter of the new bushing must be precisely processed in a professional workshop to meet the technical specifications.
Connecting rod pin to bushing (straight pin)-oil gap.......
Wear limit 0.102 mm (0.0040 inch)