How (And Why!) To Clean An Engine

How (And Why!) To Clean An Engine

Beauty is more than skin deep. Here are 11 steps to help clean any car's engine compartment.

A well-kept car looks amazing when rolling down the street, and it drives better. But, more driving means exposing a car to pebbles, grime, greasy and oily residues, dirt and particles. This unwanted debris can also accumulate under a car’s hood.

For a car owner to enjoy the beauty of a clean car, it’s vital to address the cleanliness of the interior, exterior and under the hood — the engine.

The engine is the heart of the car. Keeping it clean means giving a car the power to perform smoothly. 

Why clean a car engine?

Typically, people who live in urban areas with paved roads and experience little or no debris should clean their engines twice a year.

However, those who live in the country or do a lot of off-road driving — where they encounter a lot of dust, grime and debris — should clean their engines every three months. The same applies to those who live in areas that experience extensive snowfall and rain.

Cleaning a car’s engine has numerous benefits, but it’s vital to do it safely to avoid making mistakes that can cause malfunctions.

For example, engine sensors and wires should not be exposed to water. They can cause short circuits, leading to a faulty engine which can be very expensive to repair.

Benefits of cleaning a car engine

  • It prevents combustive materials, such as oil or leaves, from building up and becoming a fire hazard.
  • It removes debris and road salt, thus reducing corrosion.
  • It makes it easier to spot any potential danger, such as leaking fluids and cracks, before they become problematic. This means having a clean engine can make a car safer and protect the driver from breakdowns and accidents.
  • A clean engine improves a car’s look, thus increasing its resale value.
  • A layer of grime in the engine makes it work harder, thus using excessive fuel. But a clean car engine improves a car’s fuel economy and performance, thus saving money.

How to clean a car engine

1.     Schedule.

Ideally, opt for a warm day. Warmer weather, which is low in humidity, will help the car engine to dry faster.

2.     Prepare the cleaning supplies.

To effectively clean a car’s engine, you will need some equipment and products, including;

  • A non-metallic scrub brush
  • Simple, all-purpose cleaner
  • Air compressor or a clean towel
  • Tape and a plastic bag
  • Water sources, preferably a pressure washer
  • Safety glasses and gloves
  • Biodegradable engine degreaser
  • Wrench for removing the battery cables.

3.     Allow the car to cool off.

If the car was running, switch it off and flip open the hood to allow the hot engine to cool off for a few hours before cleaning it. In fact, it’s advisable to clean the engine in the morning since the car would have cooled down overnight.

Pouring cold water on a hot engine can warp and crack it, leading to expensive repairs. Additionally, a hot engine instantly dries off the cleaner, leaving the engine with unwanted spots.

4.     Tighten the dipstick and caps.

Tightly seal the brake fluid, power steering fluid, coolant and other liquid reservoir caps. Please press down the dipstick to ensure it is adequately sealed.

Doing this prevents the water from getting into the fluids, thus preventing chemical reactions and degradation, that can damage the engine.

5.     Disconnect the battery.

First, disconnect both battery terminals and, if possible, remove the whole battery to enable you to clean that area comfortably. Disconnecting the terminals ensures you protect them from getting wet and damaged.

6.     Cover up.

Cover up the sensitive electrical components using a plastic bag and seal them tightly with electrical tape. Protect features like engine control units, ignition wires, distributor caps, spark plugs, coil packs, alternators and other filters.

Protecting these compartments from getting wet will ensure you thoroughly clean the engine without the fear of damaging anything.

7.     Degrease.

Agitate the surface grime and dust using a brush with synthetic bristles, and vacuum it up. After scrubbing off the dirt, wet the engine bay using warm water to help in removing loose grime and dirt. Then, spray the degreaser throughout the engine compartments, and allow it to soak for 10 minutes.

Pay special attention, and add more grease remover to the caps, hoses, fluid containers and firewall, which always have extra grime buildup.

8.     Rinse.

Rinse out the engine bay using a weak stream of pressure sprayer. Avoid using a high-pressure sprayer, since it may leak water onto the covered areas, causing problems. Start rinsing from the back, going to the front.

9.     Finish up.

After rinsing it, wait for the water to evaporate, and then wipe the engine using a soft microfiber cloth. Alternatively, you can use a compressor to blast in the air to the nooks and crannies, thus removing excess water.

Remember wiping the engine removes not only water but also the remaining grime.

10.  Remove the coverings, and reconnect the battery.

After wicking up the water, remove the plastic and electrical tape from the covered areas. Dispose of them correctly. Leave the engine with the hood up for about an hour or until everything completely dries out.

Reinstall the battery terminals and reconnect the battery.

11. Start the car.

Once the engine is completely dry, start the car and allow it to run the usual way until it reaches its operating temperature; you can drive it or switch it off.

Things to avoid when cleaning a car engine

Don’t be too quick to take the car’s components out; you might misplace them or put them back improperly. It’s advisable to take a picture of any part you want to remove.

Don’t go crazy with the cleaning chemicals. Some engine cleaners can leave residue on an engine, leading to corrosion.

Conclusion

Make it a habit to advertise the need to clean a car’s engine regularly using the above steps. That way, it becomes easy to keep the engine looking good and also be able to identify and resolve any emerging engine problems while ensuring safety.


Darren Tobin is a personal injury lawyer at his firm, Tobin Injury Law. He and his team help injured victims as well as surviving family members who have lost a family member to wrongful death recover from their losses.

This article is courtesy of Professional Carwashing & Detailing.

You May Also Like

Battery Management Means Knowing How It Ages

The battery may be fully charged, but you also need to measure how low the voltages go while the engine is cranking.

An intelligent power management system needs to know the condition of the battery, which determines the loads and the output of the alternator. The battery is not a constant part of the power-management equation. As the battery ages, temperature and internal conditions govern the capacity and output of the battery.

AC Service – R1234yf

With a few simple steps, you can ensure that your A/C machine is properly maintained and ready for the upcoming A/C season!

Ignition Coil Output

To see inductance inside the primary windings, use an amp probe placed around the positive wire for the ignition coil.

Compressor Oil for R1234yf

Working on R-1234yf systems is not that different from the R-134a variety.

Turbochargers on Minis

No matter if it is a BMW or MINI, when the engine stops turning, the oil flowing to the turbocharger stops.

Other Posts

Servicing Mercedes-Benz AMG Brakes

Take a look at some of the things you need to know in order to service the brakes on a Mercedes-Benz AMG vehicle.

Mercedes-Benz ABC Suspensions

The system provides great ride & handling, but it can be complicated to service if you do not have the right training.

BMW Headlight Service

Taking a guess can get very pricey if you can’t return the part. 

Carbon Deposit Q&A

Follow along to learn more about carbon deposits.