Originally Posted by buster
Originally Posted by ChrisD46
I can appreciate a clean engine - but never read much consensus regarding how to safely do it without getting things wet that should not get wet ? ... That goes for the engine cleaning sprays from WM or auto parts stores as well - some engine cleaning sprays may be safe , perhaps other engine cleaning sprays not so much .
I believe it comes down to common sense. All of the components under the hood are "water resistant", however that does not mean you can drench them in water. You don't ever want to powerwash the engine. I try and cover all visible sensors, alternator and engine valve cover/coils. I always use a gentle hose spray. I get the engine wet first, then spray with Simple Green HD. I use a large paint brush and go over as much of the area that I can. I then rinse it off and use the electric leaf blower to dry it. I start the car ASAP to get the engine hot so it will further dry it out (and also check if I messed something up). Once the engine is fully dry and hot, I spray it with 303 or whatever engine dressing you choose and shut the hood. It ends up leaving a nice finish on it. I've been doing it this way for 20 years and never had a problem.
Now, now, let's not go overboard. I've power-washed every engine I ever had, and it's not introduced any problems yet.
While you certainly don't want to stick the nozzle of a high pressure power-washer gun right up against sensitive components, there is no danger in giving them a good spray of water from 4-5 feet away.
If there is, then I have been extremely lucky over the years...