Originally Posted by AVR2
I'm cleaning my block deck prior to dropping the head back on. How clean does it need to be? Literally a mirror-like finish all over? Does it have to pass a "white towel test"?
A mirror finish is not
advisable, as that will inhibit gasket sealing.
is a must. Thumb rule for me? Wipe the pad of my thumb on the deck in a few places, then lick my thumb. If I taste anything, it's not clean enough (rinse & spit a few times, don't swallow. I find that using tonic water or club soda leaves your tongue cleaner than just plain water for this.)
If you've got the slugs & crank out, a final scrub all over with a Scotch-Brite pad and hot, soapy water (hottest you can stand!) will finish the job nicely. You're using hot water so it all evapourates off in 5-10 minutes. Do that immediately before you assemble; if you have to do it at the end of the day, then wash, let dry, and wipe down with a rag dampened with clean air-tool oil or light machine oil. Before assembly, wipe the gasket sealing surfaces clean with a rag wet with solvent (acetone, toluene, MEK, carburettor cleaner, denatured alcohol - any mild organic solvent will serve.) Let dry for about two minutes before putting the gasket in and putting it all together.