OPENING TASK:OPENING TASK:

Take out notebook and pen or pencil Take out notebook and pen or pencil Answer the followingAnswer the following Describe the main advantages of a in-Describe the main advantages of a in-

line five cylinder engine.line five cylinder engine. Explain which engine would take up Explain which engine would take up

less space in a engine compartment, less space in a engine compartment, in-line 5 or a V6.in-line 5 or a V6.

Aim: what are parts of a Aim: what are parts of a piston?piston?

INSTRUCTIONAL INSTRUCTIONAL OBJECTIVESOBJECTIVES: Students : Students

Will Be Able To Will Be Able To (SWBAT):(SWBAT):

   Name all parts of a piston Name all parts of a piston Explain cam-ground piston Explain cam-ground piston Explain the reason there are two Explain the reason there are two

compression rings. compression rings.

Aluminum piston for lightweight and strength.

Piston Construction

Skirt - below pin hole.

Connecting rod to crankshaft.

Rapid changes of speedand direction.

Pin connects piston toconnecting rod.

Compression height

Skirt

Cylinder

Connectingrod

Pinhole

Next >

1

A) The side

B) The compression height

C) The skirt

D) The connecting Rod

What is the part of the piston below the pin called?

Question

Top of piston is hottest.

Piston Shape

Piston tapers to top.

Cam-ground piston, oval for expansion.

Expands acrossminor diameter.

300-350ºF

300-450ºF

600-700ºF

Minordiameter Next >

2

The top of a piston will be slightly oval in shape when cold. Is this true or false?

Answer True or False.

Question

Piston Rings

Compression rings preventpressure leakage.

Two compression rings.

One oil ring.

Ring gap to allow expansion.

Expand when hot.

Angle joint

Step joint

Butt joint

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Oil Ring

Wipes oil off cylinder wall.

Holes in piston under oil ring.

Returns oil to crankcase.

Piston pin hole below oil ring.

Next >

Connecting Rod Construction

Connecting rod has a small end and a big end.

Big end has bearing inserts.

Small end may have a bushingfor the piston pin.

There may be an oil hole inthe small end.

Each rod and cap must benumbered for identification.

Next >

Piston Assembly

Oil ring

Piston

Connecting rod Bushing

Compression rings

Snap ring

Piston pin

Bearing shells

CapNext >

4

A) Bushing

B) Snap ring

C) Connecting rod

D) Piston ring

What connects the piston to the crankshaft?

Question

summarysummary

What are the Main parts of the piston?What are the Main parts of the piston?

Why is the top of the piston slightly Why is the top of the piston slightly oval when cold?oval when cold?

How is the piston connected to the How is the piston connected to the crankshaft?crankshaft?

6

A) Oil

B) Water

C) Piston pins

D) Counterweights

Which of the following are added to reduce vibration in a crankshaft?

Question

7

A) Crankpin

B) Counterpin

C) Oil pressure

D) Counterweight

What is another name for the journal of a crankshaft?

Question

Oil Holes and Grooves

The crankshaft rotates in the bearing shells between the cylinder block and the caps.

Grooves and holes areincluded to allow oil circulation.

Cylinder block

Bearing cap Next >

8

A) To allow air to circulate

B) To allow for expansion

C) To help relieve stress

D) To allow oil to circulate

Bearings have holes and grooves in them. Why is this?

Question

Thrust Bearings and Washers

Prevents lateral movement of the crankshaft.

May be thrust flanges on main bearings, or separate washers.

Main bearing and connecting rod (big end) bearing shown.

Bearing cap

CrankshaftBearing

Thrust washer

Main bearing

Next >

Seal keeps the oil in, and dust and dirt out.

Oil Seals

Recess in cap locates neoprene seals.

Main bearingseal

Oil groove

Oil seal recess Next >

Body

Inner seal lip

Spring Outer seal lip

9

Main bearing oil seals are usually made of silicone. Is this true or false?

Answer True or False.

Question

Shafts are chain or belt driven from crankshaft.

Balancer Shafts

Reduce vibration forces and therefore engine noise.

Oil pressure is fed to bearings.

Guide

Drive chain

Balancer shafts

Bearing

housing

Next >

10

A) To prevent the engine from running too fast

B) To keep the piston moving when the engine cuts out

C) To enable better starting and stopping

D) To reduce vibration and noise

What is the purpose of Balancer Shafts?

Question

Summary

Pistons and Pins

Crankshafts and Bearings

Oil Seals and Balance Shafts

You should now be aware of:

End >

Connecting Rods