172 Engines L2 L4

What is the operating pressure of the fuel in a CRD engine?

• 3 BAR

• 180 BAR

• 1500 BAR

• 1800 BAR

What are items pictured?

• Pencil coils

• Glow plugs

• CRD Injectors

• CRD spark plugs

What controls the firing on a CRD fuel system?

• ECU

• When injector reaches pressure

• Timing pump

• Scavenger pump

An absorption silencers does what?

• absorbs high pitched noise

• absorbs low pitched noise

• absorbs NOx from exhaust

• Absorbs CO from exhaust

Expansion silencers remove low pitched noise.

• True

• False

Why is the catalytic converter fitted near to exhaust manifold?

• To allow quick heat up

• To silence noise

• to allow fresh oxygen into sensor

• It does not matter where fitted

What gas is the most environmentally damaging?

• NOx

• HC

• O

• CO₂

What is name given to exhaust gas NOx

• Nitrogen dioxide

• Oxides of Nitrogen

• Sodium Oxide

• Oxide of Sodium