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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 03-23-2016, 03:05 AM   #1
selepe
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Join Date: Dec 2015
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Engine cleaning

Good day, whats the most efficient way to clean engine,thnx
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Old 03-23-2016, 07:38 AM   #2
markusmarkus
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Simple Green, liquid dishwashing detergent (Dawn is great), a spray bottle of water, speedy scrubbers. Don't use a power washer on the engine! You'll end up with water in places that don't like water!

http://www.mcmaster.com/#73055t25/=11nvvmo
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Old 03-23-2016, 07:50 AM   #3
TynWarrior
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Yup what he said. Wet the engine bay, then spray with degreaser, wait a minute or two, then rinse and/or wipe with rag.

Also Ive heard you should cover the fuse box area, the alternator and CAI filter (if have one). I hsually just throw plastic bags over those, just in case.

And learn how to google/search, this has been covered a million times!
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Old 03-23-2016, 10:08 AM   #4
Gus-CO
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Against all advises I always power washed my engine. Never had a problem.

The only care I take is to have the engine hot, and wash it when it's running. The latter is just so in case it stops I know what I was pouring water onto when it happened.

I sprau water, then degreaser then water again.... I can't wait because the engine is hot and I live in Colorado so it will get dry in a few seconds if I don't rinse quick.
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Old 03-26-2016, 01:36 PM   #5
hatetolovee46
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Quote:
Originally Posted by Gus-CO View Post
Against all advises I always power washed my engine. Never had a problem.

The only care I take is to have the engine hot, and wash it when it's running. The latter is just so in case it stops I know what I was pouring water onto when it happened.

I sprau water, then degreaser then water again.... I can't wait because the engine is hot and I live in Colorado so it will get dry in a few seconds if I don't rinse quick.
DO NOT SPRAY COLD WATER ONTO A HOT ENGINE BLOCK
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Old 03-28-2016, 05:38 PM   #6
Gus-CO
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Originally Posted by hatetolovee46 View Post
DO NOT SPRAY COLD WATER ONTO A HOT ENGINE BLOCK
Can you please elaborate? A hot engine block will be at 216F maximum (and that's at full load). Definitely not enough to transition into a different crystalline form....

Temperature change shock would be a problem why then?

Remember, older cars didn't have a splash guard so the engine would get sprayed by ice cold water whenever driving on rain. Also, as long as you don't let your engine suck water, you can drive underwater if your car doesn't float. They even sell snorkels for off-roading.

According to your theory this jeep is trash after the crossing is complete:

Last edited by Gus-CO; 03-28-2016 at 05:41 PM.
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Old 03-28-2016, 06:14 PM   #7
hatetolovee46
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Because i have personally seen a guy spray his cameros engine bay with ice cold water and the head cracked. Wether there was a preexisting fracture or not idk, rain or short bursts or jeeps are one thing, i would not do it to a euro car. In all likely hood i agree no damage will likely occur, but after witnessing that i wont take my chances. Recrystalization of steel into austinite does not occur to 1400F, it is thermal expansion and contraction that is the concern.
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