1. Chapter 5
Cleaning the Engine

2. Objectives Safely and correctly use cleaning tools and equipment
Describe the best choice of cleaning method for a particular application

3. Cleaning with Bases Cut grease very well Work best when heated
Most automotive soaps are alkaline

4. Cleaning with Acids To remove rust and scale Will not cut grease
Remove grease and oil with alkaline solution before using acid to remove rust
They can cause damage to air conditioning and electrical components

5. Cleaning with Acids

6. Cleaning with Solvents
Three types of solvents:
Mineral spirits
Water-based
Chlorinated hydrocarbons
Disposal of solvents is regulated by hazardous waste laws

7. Solvent Parts Cleaning Tanks
Use a petroleum-based solvent
Include a bristle tip parts brush for removal of grease
Some include agitators to keep solvent moving for reduced cleaning time

8. Solvent Parts Cleaning Tanks

9. Hot Soak Tanks One of the oldest forms of cleaning
Items are soaked for one to eight hours
Parts are placed in basket or lifting table

10. Hot Soak Tanks

11. Spray Washers Similar to a dishwasher Heats water to 180ºF or hotter
Parts are placed on a rotating platform

12. Spray Washers Advantages Disadvantages Speed, safety, and drying time
Do not clean oil galleys as well as hot tank
Parts rust if not removed immediately

13. Spray Washers

14. Manual Cleaning Methods
Wire wheel
Handheld wire brush
Sandpaper
Scotch Brite
Surface conditioning discs
Handheld gasket scrapper

15. Glass Bead Blaster Effective for carbon removal
Removes flaws and stress spots
Compressed air forces glass beads through a nozzle
Use caution when bead blasting engine parts
Glass beads can get lodged into oil galleys

16. Glass Bead Blaster

17. Soda Blaster Baking soda
Soda used once and is not reclaimed
Removal or residual baking soda from galleys is not as crucial as glass beads
Works well for carbon
Not as effective on rust

18. Soda Blaster

19. Airless Blaster Shot Blaster Environmentally friendly
Oil and grease must be removed first
Tumbler is used after to remove steel shot
Process distorts machined surfaces
Shot comes in different sizes

20. Thermal Cleaning High temperature oven turns oil and grease to ash
Convection
Open Flame
Ferrous metals are cooked at 700ºF
Aluminum is cooked at 450ºF