1. Automotive Engines
Part 3 (internal Parts)

2. Internal Parts of Block

3. Internal Parts of Block
Crankshaft –
converts linear motion to rotational motion
Made from cast iron or forged steel
Cast iron = cheap
Forged Steel = strong

4. Crankshaft Purple – PTO Flange Red – Crankpin, Throw, Offset
Blue – Main
Yellow – Counterweight
Green - Snout

5. Internal Parts of Block
Piston –
a cylindrical part fitted in a cylinder transmitting power created by the combusting fuel & air
Cast Aluminum – Factory
Hypereutectic – Street/Strip
Forged – Hi-Perf

6. Piston
Blue – Dome
Green – Ring Land
Red – Skirt
Purple – Wrist Pin

7. Internal Parts of Block
Connecting Rod –
connects piston to crankshaft
I – Beam or H – Beam
Cast, Forged, Powdered Metal
Iron, Steel, Aluminum, Titanium
7/22

8. Connecting Rod
Blue: Big End
Green: Small End
Red: Bearings
8/22

9. Internal Parts of Block
Camshaft –
controls valve movement (Dist. Drive, Fuel Pump)
2. Two Main Types
Flat Tappet
Solid or Hydraulic
Roller
Mechanical or Hydraulic
9/22

10. Roller & Flat
12/22

11. Camshaft (Flat)
Flat Tappet Lobe: Narrow and “Peaky”
11/22

12. Camshaft (Roller)
Roller Lobe: Wide and flat
12/22

13. Tappets – Roller Vs. Flat
15/22

14. Flat Tappet (Hydraulic Vs. Solid)

15. Roller Tappet (Hydraulic Vs. Solid)
15/22

16. Internal Parts of Block
Timing Chain / Gears –
connect crank to cam
16/22

17. Timing Chain / Gears
17/22

18. Internal Parts of Block
Oil Pump – pushes oil throughout engine
Gear Type
A pair of gears mesh with each other and revolve in a close fitting housing. Oil fed in at one side is carried out round the edge and out the outer side.
Rotor Type
An inner rotor meshes with the outer one which has one more lobe. Having different axes of rotation the spaces vary in size, causing oil to be drawn in and forced out.
18/22

19. Gear Type
19/22

20. Rotor Type
20/22

21. Internal Parts of Block
Bearings (2 types)
Plain
Roller
Plain type: item rides on a film of oil
Three types
Mains – allow crank to spin (2 piece)
Rods – allow rods to spin (2 piece)
Cam – allow cam to spin (1 piece)
21/22

22. Bearings
22 of 22

23. The End