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Old 10-13-2010, 09:57 PM   #1
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JK Engine Cleaning - Mud/Dirt/Oil

No shortage of information from people about this but I still don't know if this is safe or not. I need to clean the outside of my engine. Lots of light mud got sprayed up under my hood recently and it needs to come off. I want to do this right though and not risk doing a single bit of damage to the engine. I've seen lots of cleaners and engine degreasers (mostly recommended) to spray on and then wash off but spraying my engine even lightly with water seems to be a bad idea from most including myself. What's the truth about this? Is ok to do or not? Why are there so many "experts" saying it's ok and also don't do it?

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Old 10-13-2010, 10:15 PM   #2
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You drive in water every time it rains......... Just steer clear of the electronics and it should be fine. If you use a pressure washer, set it to stun, not kill....

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Old 10-13-2010, 10:19 PM   #3
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I've taken the hose to my 4.0 and it's still alive, just make sure it's not hot or you could crack a head or a block because of the temp difference, just make sure that you don't pour water into you intake and you'll be ok. Also might wanna cover your dist cap cause if that gets wet you won't beable to start it till it dries out >.<
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Old 10-13-2010, 10:23 PM   #4
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It's really just a choice you will have to make. I've personally been using wd40 for over 12 years with no I'll effects whatsoever. I spray everything down really well, except the belt, them lightly rinse it off. As soon as I'm done, I strategy it up and let it dry itself. Comes out looking showroom new. Since the wd stands for water displacement, I figure it keeps water out of the electrical stuff. Like I said though, it's ultimately up to you, but I've never had a problem with this method.
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Old 10-13-2010, 10:26 PM   #5
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Saw this video on youtube. People were saying to not get any water on your electronics but this guy is spraying the engine bay like its on fire. I see lots of cables and wires under my hood but what do you avoid? All of them?
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Old 10-13-2010, 10:35 PM   #6
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You don't lol most of the electronic connections under the hood should we water tight, atleast mine are, spraying down the electronics won't really hurt them just let it all dry before driving it if your worried. I spray the crap outa my YJs engine bay just staying clear of my distributer and if that gets wet it just needs to dry before it will start
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Old 10-14-2010, 07:15 AM   #7
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As soon as I'm done, I strategy it up and let it dry itself.
You "strategy" it up? What does that mean?
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Old 10-14-2010, 08:35 AM   #8
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"start it up??"

I've been PW all my cars engines for 30 years...no issues.....
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Old 10-14-2010, 09:15 AM   #9
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I'm kinda getting the feeling that light power washing your engine is ok but being mindful of electronics, alternator, and distributor cap. Does a dealership offer this service in their detailing department? Just curious because if something did go wrong, they would be responsible instead.
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Old 10-14-2010, 09:26 AM   #10
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Originally Posted by Square_Eyes
I've taken the hose to my 4.0 and it's still alive, just make sure it's not hot or you could crack a head or a block because of the temp difference, just make sure that you don't pour water into you intake and you'll be ok. Also might wanna cover your dist cap cause if that gets wet you won't beable to start it till it dries out >.<
Not unless you have dyelectric grease on those fittings
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Old 10-14-2010, 09:57 AM   #11
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I've taken the hose to my 4.0 and the 3.8 many times. Not a problem so far.
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Old 10-15-2010, 07:22 AM   #12
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I meant start it up. Damned iPhone. One letter outta place and it throws up a totally different word.
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Old 10-15-2010, 07:45 AM   #13
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To ask the stupid question...

So how bad is the mud for things? I'm sure some compositions are worse than others... but as a generality...

I just know the farm trucks and my jeep have the interior walls of the engine compartment caked with mud/dirt/whatever... The engine probably is no better...
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Old 10-15-2010, 08:55 AM   #14
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To ask the stupid question...

So how bad is the mud for things? I'm sure some compositions are worse than others... but as a generality...

I just know the farm trucks and my jeep have the interior walls of the engine compartment caked with mud/dirt/whatever... The engine probably is no better...
It depends on where the mud is. It can cause uneven brake wear and tear if its dried onto your brake discs and it can cause corrosion or discoloration on other surfaces over time. Getting it off right afterward is the most important I think. Easier too. Not sure about places under the hood that it might affect?
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Old 10-15-2010, 10:46 AM   #15
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It depends on where the mud is. It can cause uneven brake wear and tear if its dried onto your brake discs and it can cause corrosion or discoloration on other surfaces over time. Getting it off right afterward is the most important I think. Easier too. Not sure about places under the hood that it might affect?
I really hate how fast mud can discolor the fenders on my JK. Seems like I go through a bottle of Back to Black every two months. I know I know don't wash her, but I would like the jeep to be somewhat asthetically pleasing when I attempt to upgrade in a few years.
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Old 10-15-2010, 12:13 PM   #16
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Just picked up some Purple Power and applied it to the undercarriage of my Jeep. Cleaned up nicely and got rid of the dried mud and dirt. Haven't tried it on the engine yet. Honestly, I don't know if I will clean the engine seeing as I still cant decide whether or not I can do it safely.
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Old 10-15-2010, 12:55 PM   #17
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Just picked up some Purple Power and applied it to the undercarriage of my Jeep. Cleaned up nicely and got rid of the dried mud and dirt. Haven't tried it on the engine yet. Honestly, I don't know if I will clean the engine seeing as I still cant decide whether or not I can do it safely.
Ive sprayed loads of engines down at a car wash including a discovery 2 which is full of electronic shit and ive never ruined anything or had a light come on.
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Old 10-15-2010, 04:02 PM   #18
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I'm also one that has "hosed down" the motor, long time now. If it's an aggressive wash down, I'm very careful of the electrical parts, and sometimes have the engine running.

I've had the best results from "orange" cleaners......plus I like the bio-degradable aspect.
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Old 10-15-2010, 07:11 PM   #19
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Another funny observation is that after using the cleaner and power washing the unders of my Jeep it now shifts smoother? Weird.

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