Perkins 2800 Workshop Manual page 71

4
2800
To assemble
1 Check the gaps between the ends of the piston rings when the rings are inserted in a new liner. The rings
can also be checked by insertion in an unworn part of a used liner.
For the correct dimensions refer to Chapter 2, Specifications.
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 180 degrees from
the joint of the spring.
3 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-1" 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
120 degrees apart.
7 Fit the piston crown into the piston skirt and insert the connecting rod. Apply clean engine oil to the gudgeon
pin (A2) and install the pin. Fit the circlips (A1). 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 connecting rod and
connecting rod cap.
9 Fit the pistons and connecting rod assemblies, Operation 4-1.
Workshop Manual, TSD3450E, Issue 1 61