What is the best way to clean sludge off an engine?

Answer 1

I have a spray gun for an air compressor that siphons in the detergent. I use Simple Green or Purple Power.

I like this because while it has power to remove the grime, it isn't as strong as a pressure washer which can sometimes force water where you don't want it.

Your electrical connectors and other enclosures are certainly designed to handle wetness, like rain and what splashes up occasionaly while driving - but not realy being projected at 1500 to 2200 PSI from a foot away from a nozzle!

They're like $10 here's a link...

http://www2.northerntool.com/product/12796_12796.htm

Auto stores should have them as well.

Answer 2

With any of these methods, protect the air intake and ignition system and any place the cleaner may get inside the engine.

From the exterior of an engine, I prefer to use Castrol Super Clean. Be careful not to mix it too strong as it will strip the paint and burn your skin.

Also, Gunk Engine Bright works well.

Steam also works well.

With either products, apply. Scrub with a brush. Let soak a while but don't allow to dry. Scrub with a stiff brush again. Rinse with water.

Answer 3

If you just want it cleaner in the vehicle I like the orange clean stuff Citra-Solv 1-866-237-7445 in a pressure washer
If you are rebuilding it: just take it in peices to the place that will bore it out and fit the cam bushings and have them tank it - if you are paying for machining they usually do not charge for the cleaning. Remember to pain the engine after you get it back: Red for chevy, gold for olds, Blue for ford, etc (keeps the rust off).
But mask off any openings

Answer 4

steam cleaning.( high pressure water gun)... exterior
hot tank... interior