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MCE Engines Quick TipThink You're Clean?Think your cylinder bores are clean and free of contamination? Guess again. Before Marvin installs reciprocating components, he does a complete block wash with mineral spirits, wiping down the cylinder bores using a lint-free cloth along with WD-40 as a solvent and lubricant. He continues the wipe down until the cloth shows clean. Any contaminates (dirt) or fine metal particles can adversely affect ring seating.