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帕金斯柴油機活塞和連桿組件維修的安裝方法

2016-5-8 18:55:19

帕金斯柴油機活塞和連桿組件維修的安裝方法

Pistons and connecting rod assemblies

2800

To remove and to fit

Special requirements


Operation 4-


To remove

  Remove the cylinder head assembly, Operation -5.

2  Remove the oil pump, Operation 0.


Anti-seize compound


CV60890

  Remove the stiffener plate from the base of the crankc ase.

4  Remove the carbon ridge from the top inside surface of the cylinder liners.

5  Turn the crankshaft until two pistons are at bottom centre.

6  Remove the bolts (A) and the bearing caps. Push the connecting rods and pistons up until the rings are

free from the cylinder liners.

7 Withdraw carefully the pistons and connecting rods from the cylinder liners. Store the bearing caps with their

relev ant connecting rods.

8  Repeat steps  to 6 for the remainder of the pistons and connecting rods.


2800

To fit

  Apply clean engine oil to the piston rings, the connecting rod bearings and the cylinder liners.

2  Ensure that the piston ring gaps are set at 20 degree intervals to each other.

 Use the special tool (B), GE5000 for 2806 engines or GE50045 for 206 engines , to install the piston and

the connecting rod in the cylinder liner (B2). The connecting rod must be fitted with tab groove side of the big

end bearing at the opposite s ide to the camshaft. Proceed with care to ensure that the piston rings are not

damaged during the operation.

Caution: Bearing caps must be fitted to their original connecting rods,

4  Fit the bearing cap to the connecting rod. The cap must be fitted with its number on the same s ide as that

on the connecting rod and the number must be the same.

5  Apply anti-seize compound, CV60890, to the bolt threads. Install the bolts and bearing cap. Tighten each

bolt in the bearing cap to a torque of 90 +/- 8 Nm (66 +/- 6 lbf ft). Make a temporary mark on each bolt and the

bearing cap, then tighten each bolt by an additional 90 +/- 5 degrees.

6  Repeat steps  to 4 for the remainder of the pistons and connecting rods.

7  Fit the stiffener plate to the base of the crankcase.

8  Fit the oil pump, Operation 0.

9  Fit the cylinder head assembly, Operation -5.

4


2800

To dismantle and assemble

To dismantle

  Remove the pistons and connecting rod assemblies, Operation 4-.


Operation 4-2


2 Remove the big-end bearing shells (A5) from the connecting rod (A4) and connecting rod cap. If the bearings

are to be used again, make a note of the position where they were fitted.

  Remove the circlips (A).

4  Remove the gudgeon pin (A2) and separate the connecting rod and the piston crown from the piston.

5  Remove carefully the piston rings (A) from the piston crown and clean the piston ring grooves with a

suitable cleaning tool.

Special equipment is required to renew the small end bearing. If this operation becomes necessary, contact

your Perkins dealer.


2800

To assemble

  Check the gaps between the ends of the piston rings when the rings are inserted in a new liner. The rings

can also be c hecked by insertion in an unworn part of a used liner.

For the correct dimensions refer to Chapter 2, Specific ations.

2  Fit the spring of the oil control ring to its groove in the piston crown.

Note: The oil control ring must be fitted over the spring with the gap of the oil control ring at 80 degrees  from

the joint of the spring.

  Use a suitable piston ring expander to fit the oil control ring to its groove in the piston crown.

4 Fit the second (intermediate) piston ring with the side that has the identification "UP-2" toward the top of the

piston. Use a suitable piston ring expander.

5 Fit the first (top) piston ring with the side that has the identification "UP-" toward the top of the piston. Use

a suitable piston ring expander.

6  When all three piston rings have been fitted, adjust the position of the piston ring gaps so that they are

20 degrees apart.

7 Fit the piston crown into the piston skirt and insert the connec ting rod. Apply clean engine oil to the gudgeon

pin (A2) and install the pin. Fit the circlips (A). Ensure that the circlips are located fully in the grooves of the

piston.

8 Fit the big-end bearings to the connecting rod (A4) and connecting rod cap. If the original bearings are to be

used, ensure that they are fitted to their original positions.

Note: The tabs at back of the bearings must be located correctly  in the tab slots of the connec ting rod and

connecting rod cap.

9  Fit the pistons and connecting rod assemblies, Operation 4-.


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