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BrianS
18-09-2001, 03:01 PM
I eventually got round to cleaning the engine on the car two weekends ago and surprisingly, it was tougher than I thought it was going to be. There's not much to it but its just a pain for perfectionists like me. It took about an hour, but I think that with a bit of practice, I can do it a lot quicker.

Here's how it went. The engine & compartment wasn't really greasy as such, but caked with dirt. Its my girlfriend's car - a 94 Astra and this is the first time the engine was cleaned. First I watered down the entire compartment and outside panels, grill & bumper, also the underside of the bonnet. I used a bottle of Autoglym Engine degreaser with a paintbrush which is about £10 in all. (Tip - put some masking tape around the metal of the brush - accidents happen & metal scratches).

First I sprayed from the bottom up, liberally covering everything with the spray inside the compartment, and also the underside of the bonnet. I left the spray on the engine, etc to dwell for a while so in the meantime, I cleaned the bonnet which was caked with mud, etc. That was a bit tough because of the angle, but I used the paint-brush and an old cloth and gave it a good few wipes & swipes and eventually I got it as clean as I wanted. Not spotless, but I'm not really worried about any bits of dirt under here.

Next I went to work on the engine surfaces. The dwelling time of the cleaner softened up the dirt pretty well and a good agitation with the brush took 80% of the surface dirt. So I rinsed it all off and repeated the engine bit. The suds were too dirty and I couldn't tell what was getting cleaned properly so it was worth the second application. More brushing and wiping and rinsing and I finished the hard part. Just to get it all looking nice and clean, I washed the jamb that the bonnet sits down into and then put a bit of wax on the painted surfaces around the top and the underside of the bonnet. All that was left was to turn on the engine and let it dry off.

In the end it looked fairly good. But it is a 7 year old engine so some of the surfaces were a bit worn-looking. I didn't expect it to shine but I was impressed with it. One thing though - I had run out of dressing for the black plastics so they still looked old and grey. I didn't think to take a before & after picture, but there was a huge difference.

I didn't use a pressure washer on it but next time I probably will try it - but its important to avoid the electrics/ electronics, especially on newer or bigger luxury cars. Otherwise, with a little care, they can withstand a bit of water and cleaning.

If I was about to sell my car, I would ad this to my task list. Potential buyers always look under the bonnet and this will help it sell a lot quicker on the second-hand market and most likely get you more money. Be warned, its a dirty job. Wear your working clothes!!

Another tip; Autoglym instrust that the degreaser be applied on a cold engine, but if you warm it up enough to comfortably put your hand on it, this will take the dirt off with less effort.

Any q's let me know.

Take Care Out There. :cool:

Brian

WhipLash
18-09-2001, 04:44 PM
I’ve seen some people washing out their engine with a power washer. I’d have thought that this could cause water damage to the electrics?

Exactly what risk is one taking when washing the engine? Whats the most damage one can do?

I agree Brian that every potential buyer will always look at the engine bay to see how clean it is. Its certainly a good idea all right to have it looking decently clean, and could make up the mind of the buyer that your car is the one that they want to buy.

Are there any extra precautions one should observe if cleaning a diesel engine?

BrianS
19-09-2001, 02:26 PM
I hear Diesel engines are even more resistant to water than petrol engines so there shouldn't be anything different with them. (Anyone care to elaborate as to why? -something to do with spark plugs etc.?) You are absolutely right about the electrics or electronic components. I would treat them with kid gloves - even cover them with a plastic bag and seal with an elastic band. This is where damage might occur otherwise. Leave the engine running or even better, take it out for a drive when you are finished. This will get dry the engine off and remove water out of any crevices.

Other Potential damage? If you are going to put a dressing on, make sure its a water based dressing, like Autoglym's one. A Solvent based dressing possibly - just possibly - might cause a flash fire if the engine gets extremely hot. Never use a Tire Dressing (just in case anyone gets the idea).
There is also potential damage if the degreaser is too strong - especially with Antique cars - different metal, etc. IMHO Autoglym is very strong, but I haven't seen any adverse affects - that was the first engine cleaning that I've done though. Best Degreasers, or so I read, are citric acid based.

A power washer should be fine. Just don't hold it a few inches away from the surface. Give yourself plenty of room; firstly because you don't want to blast anything that might be remotely delicate and secondly because you might spray grease and dirt out onto the paint or all over yourself.

Are you going to give it a try, Whiplash?

WhipLash
20-09-2001, 01:28 PM
I don't think that my car's engine needs to be cleaned, its not old enough yet.
Brian, you emntion that the best degreasers are Citric Acid based. Well that just reminded me that washing up liquid is the same - they have lemon juice to cut through the grease. Any harm in using a bit of Fairy on the ould engine then Brian? ;)

BeCos
20-09-2001, 05:19 PM
The Autoglym stuff is the business. I used it recently on a car that was going for the NCT and just a while ago on a car I am currently selling.

I did pretty much as you stated but I did use a power cleaner with hot water and it did the job in about a minute. The hot water evaporates quicker and running the engine afterwards helps.

All new vehicles, for about 5 years have electrics that are IP65 rated, meaning they are safe from direct jets of water.............in theory !!

I still used a bag around the alarm, fusebox although the car is distributorless and the ECU is inside !

BrianS
21-09-2001, 09:07 AM
The short answer about Washing up liquid : I wouldn't recommend it.

The long answer: The Fairy Lemon Dilemna - as far as I know its pretty much the same as regular Fairy. They have a lot of chemicals that might make it inappropriate for use in an engine compartment. Its got stuff like hand-conditioners, foam-boosters and solvents which can sometimes be in the form of alcohols.These things might have a corrosive effect if they aren't rinsed off properly. Apart from that, Dish liquid might cut through the grease very well, but I wouldn't know what is the best concentration - whether a squirt in a bucket of water or rub it on raw. In truth, I don't know if it would work or not. lol - I'll check out what possible damage might occur if you want to give me a lend of your car for a week.....right!

I was just checking about the cleaners and the one I used was probably the best choice for the job. Reviews of Engine cleaning products seem to be down to personal preference and how dirty the engine is. The engine I cleaned hadn't been done in it's 7 years so something strong like autoglym was probably a good product. If an engine is regularly cleaned, milder products like citrus based cleaners, are probably better in that situation.

Ben, have you got a hot-water pressure washer? They're pretty good but expensive. There shouldn't be a problem with exposed electric components getting wet. We're talking about the engine after all and you can't avoid it getting wet unless you live in Saudi. I'd cover against the degreaser though. If you don't get it all washed off, it could corrode the wires, so its a good measure to take, just in case.

Take Care Out There,
Brian.