Note on Clearance Sizes: Green PLASTIGAGE is suitable for clearance requirements in the range of .001-.003 inches (.025 to .076mm). PLASTIGAGE is also available in other thicknesses for larger clearance specifications. Below is a guide for reference. Note, this listing is only for one piece of green Plastigage.
Green: .001 to .003 inches (.025 to .076mm)
Red: .002 to .006 inches (.051 to .152mm)
Blue: .004 to .009 inches (.102 to .229mm)
Yellow: .009 to .020 inches (.23 to 0.51mm)
Tech Tips on Use: Remove the engine oil pan to reveal the big-end and its retaining set-screws. Remove excess oil and release the big-end shells by unscrewing the set-screws. Apply a smear of grease to the journal and small quantity of silicone release agent to the shell.
Trim a length of PLASTIGAGE to fit across the journal using the grease to hold it in place. Replace the shell and tighten the set-screws to the recommended torque setting, without rotating the journal. Now remove the shell to reveal the PLASTIGAGE which will have been spread across the bearing surface as a stripe or band. Match the width of the stripe against the calibrated gauge on the package, and read the clearance.
The PLASTIGAGE stripe ideally should be removed with a clean oily cloth or degreasing solvent. However, any remaining PLASTIGAGE residue left behind will simply dissolve in motor oil and will not harm the engine in any way.