Intro into engines unit 4

Key point:

Overtorquing is the most common error.

Tech Tip:

Periodically, you should have your torque wrenches calibrated. Refer to manufacturer specifications for details.

Rubber hoses

Transport low pressure fluids

Cloth braided hoses

Transport coolant between the radiator and engine and between the engine and heater core

Metal braided hoses

Are strong and found in power steering and braking systems

Teflon-lined rubber hoses

Prevent vapors from releasing into the atmosphere

Rubber nylon hoses

Used on vacuum hose applications to prevent the hose from collapsing

Aluminum tubing is a lightweight and strong tube used in air conditioning systems.

True

Some steel pipes are galvanized to prevent rust.

True

Plastic pipes and tubes work in evaporative emissions systems.

True

Copper pipes and tubes have a tendency to break easily.

True

Rigid pipes and tubes are used in areas that do not require movement.

True

Crimp fittings include worm gear, rolled edge, twin wire, and screw tower.

False

Which of the following statements are true about flared fittings?

• Threaded connection for high-pressure applications

• Inverted and bubble are the most common types

Which of the following statements are true about compression fittings?

• The sleeve is pinched tightly into the wall of the tube

• Uses a brass sleeve called a ferrule

Which of the following statements is true about crimp fittings?

Are made by deforming a metal sleeve onto a braided rubber hose

Which of the following statements are true about clamped hoses?

• Can be easily loosened and tightened

• Are not as strong as crimped fittings

Technician A states that hoses have different types of reinforcement to withstand pressure differences. Technician B states that hoses connect components such as the radiator, water pump, and heater. Which Technician is correct?

Both Technician A and B

When there is no movement between parts, hoses are used.

False

Teflon linings protect hoses from deterioration.

True

When used in hoses, nylon prevents the hose from collapsing due to pressure differences.

True

Rubber hoses remain soft and do not harden.

False

Teflon-lined hoses are used to contain coolant.

False

Hoses are used when movement occurs between two parts.

True

Fastener fittings are _______

used in air conditioning components

AN fittings determine the _______

outside diameter of the fitting

Spring lock fittings use a _______

garter spring and cage

Flared fittings are _______

made with a special tool

Match each name of the fitting to the correct image location:

1. Spring Lock

2. Crimped

3. Fastener

4. Flared

5. Compression

6. Clamped

A feeler gauge larger than specified clearance fits into the ring end gap with the ring inserted into the cylinder.

What does this mean?

What do you do?

End gap is too wide.

Measure cylinder bore diameter to ensure it is the correct size.

Ring end gap is too narrow.

What does this mean?

What do you do?

If end gap is too narrow, the rings or the bore are the wrong size.

Check cylinder bore diameter.

If it is correct, replace or file the piston ring.

Key points:

• held in with retaining clips

• floats in the piston bore and the connecting rod small-end bore

Tech Tip:

When assembling the piston and connecting rod, make sure the piston orientation matches the connecting rod orientation.

Key points:

• Piston rings are designed to be installed in only one direction, but can be improperly installed upside down.

• When assembling the piston and connecting rod, make sure the piston orientation matches the connecting rod orientation.

Key points:

• Ensure the piston is fully coated in oil.

• Install rubber hose to the connecting rod bolts to prevent scratches or nicks to the cylinder walls and crankshaft.

• Forcing the piston into the cylinder bore may damage a piston ring land or piston ring.

• If the connecting rod cap is not installed in the correct order and orientation, engine damage will occur.

Key points:

• Surfaces should be clean.

• Bolt holes should be clear of fluids.

• Align the gasket openings with the oil and coolant passages.

Key points:

• Recheck timing mark alignment after rotating the engine.

• In belt-driven overhead camshaft engines, camshaft belt tension adjustment is crucial.