Lincoln 3R2Z-6108-BA Piston And Pin Assembly

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Compare the width of the crushed Plastigage to the scale printed on the Plastigage envelope to obtain the oil clearance and compare it to the specifications.

A piston ring installation tool should be used to carefully remove the rings from the pistons, ensuring not to nick or gouge the pistons in the process.

No, do not separate the pistons from the connecting rods. For additional information, refer to Section 18.

Tap the top edge of the ring compressor to ensure it's contacting the block around its entire circumference.

Prior to removing the piston/connecting rod assemblies, remove the cylinder head(s), the oil pan, and the oil pump (on 5.4L engines) by referring to the appropriate Sections in Chapter 2, Part A or Part B, depending on which engine is being overhauled. Additionally, on some models, there may be a sheet metal oil baffle plate attached with nuts to the main cap studs, which should also be removed.

Excessive wear is indicated by noticeable play when twisting the piston and rod in opposite directions. This must be corrected, and the piston/connecting rod assemblies should be taken to an automotive machine shop for resizing and new pins.

Use your fingernail to feel if a ridge has formed at the upper limit of ring travel, which is about 1/4-inch down from the top of each cylinder. If ridges are present due to carbon deposits or cylinder wear, they must be completely removed with a special tool called a ridge reamer before attempting to remove the pistons.