How-To: Engine Bay Cleaning

ThrillRide

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Posted this for my local buddies and thought you all might like it:

I don't do many engines since there is a large amount of liability involved. I will do them if people sign a waiver. But I'll share my ideas if you want them

My process:

1. Begin with a slightly warm engine so all gunk is loose
2. Use compressed air to remove any loose dirt or junk.
3. Put baggies over all electrical, distributor, sparks etc. Aluminum foil works great too because you can mold it around anything you don't want to get wet
4. I use P21s total auto wash. I really don't think you can find a better/safer degreaser on the market (it is also safe for the environment
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). You can buy the S100 version for bikes at any Harley store. Will save you much cash and it is the same product under a different label. There are a lot of products out there, but this one is safe and has many uses. Spray down the areas you want clean and let it sit for a few minutes.
5. Scrub all areas with a soft brush. I use a horse hair brush. Tooth brush works great too for tight spots.
6. Hose it down with a hard stream.
7. Towel dry areas that need it. Use compressed air or the blow function on your shop vac to remove all water. Remove the baggies or foil and start your engine to help aid in the drying process. Continue to blow dry if needed.
8. If you feel like more cleaning is needed use a detail spray and spray and wipe as needed. Once it is dry and cool treat all rubber and plastic with a protectant. I use 303 aerospace protectant. It is awesome, but use whatever you like. I just don't recommend the cheap over the counter greasy products (don't use anything that is a petroleum base product either). There are also some products out there that are spray on and walk away products for cleaing and protecting your engine bay. Google if you are interested.
9. Make sure you didn't get any degreasor or protectant on your paint. If so clean it off ASAP.
10. Enjoy!

Seriously you need to be carefull when cleaning your engine bay. You can really hurt your car if not carefull. So use my process if you want but remember its just the way I do it and only suggestions. Use at your own risk. Sorry have to throw that in ;) .
 
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Excellent write up, thank you. Of course the process in which you clean your engine bay can vary depending on the condition as well as how clean you want it to be.

Take my P5 for example. Most of the time my car was in the garage and just a little bit of wipe down with a degreaser was all it took from time to time.

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Yes, once you have a good clean and protection with a quality product you can maintain it very easy. I wipe down my bay about once a week.
 
Pretty much the same process that I've been using for years! Nice write up!

Here's one of my better before/afters:

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And the engine bay of my MR2 (though the MP3's is pretty much as spotless as this:)

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Another very valuable tool is a steam cleaner. If you haved some real nasty build up under the hood a quality steamer can really make the job easy. My degreaser works amazingly. But some times there is just stuff that won't come loose with cleaner and elbow grease. If you have access to a steamer it can really make jobs (not just the engine bay) a lot easier.
 
For those who don't know this...DON'T do this to your MS6 or MS3 unless you are prepared to take off the intercooler and remove the water from the top of the valve cover. The coilpacks sit down inside a 2" trench that has no drain. I've had 2 replaced in a 2500 mile / 5 month period from rainwater and car wash water intrusion.
 
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No kidding?! Well I won't go into what I think of Mazda's design on that car...
Would it be safe to cover the TMIC and continue as normal?
 
I have mine steamed and every once in a while use my parents lil steamer to do the engine. Then I throw some armor all when done to give it some shine. Oh, and that is a 10 year old engine.

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No kidding?! Well I won't go into what I think of Mazda's design on that car...
Would it be safe to cover the TMIC and continue as normal?

Safer, but not foolproof.

I can't really see a point of the design unless it was to move the coilpacks a certain amount of distance from the bottom of the intercooler. I just really wish they would've engineered a water drain.
 
I can't wait for my engine bay to get dirty so I can clean it! Nice write up :)
 
I have mine steamed and every once in a while use my parents lil steamer to do the engine. Then I throw some armor all when done to give it some shine. Oh, and that is a 10 year old engine.

Looks great, but a little warning. Armor All will eat away rubber hoses. Not immediately mind you, I just read it's not safe.
 
Josh, where did you read about armour all eating rubber hoses? I'm curious about this.

I was told that it was best to use a silicone based protectant (i.e. Black Magic), for hoses and wires.

Anyone want to add some insight to this?(dunno)

Lord knows that my enginge bay is in dire need of a cleaning. Been too busy as of late to get anything done.
 
The only insight I could add is a couple of decades worth of experience with the use of Armor All on a variety of surfaces with no ill effects to report. If it degrades rubber, its use on tires would have eventually led to the NTSB getting involved, as millions of people have included this in their detailing rituals over the years. Before there were other (and some better) products to use, there was Armor All for all rubber, plastic and vinyl.

I'm also here to dispell the urban myth that it causes dashboards to crack. This didn't happen in any of the multitude of cars I and my family have owned since I was a child. I don't use it on the interior of my cars anymore because I've acquired a taste for a more 'natural' looking interior....and I hate it when my dashboard attracts dust.

While it has long since been dethroned as a leading protectant, it isn't a rubber degrader.
 
Some idiot at "Sears" told me that I was getting dry rot on my low profiles because I was putting tire shine on them. I told them I have never had this problem with my old stockers and told him he wasn't going to convince me otherwise. He said the sun was cooking my tires.
 
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