Appendix 2

United Kingdom

Installation requirements for equipment and auxiliaries

Number	Equipment and auxiliaries	Fitted for emission test
The complete inlet system shall be fitted as provided for the intended application: (i) where there is a risk of an appreciable effect on the engine power; (ii) when the manufacturer requests that this should be done. In other cases, an equivalent system may be used and a check should be made to ascertain that the intake pressure does not differ by more than 100 Pa from the upper limit specified by the manufacturer for a clean air filter.
The complete exhaust system shall be fitted as provided for the intended application: (i) where there is a risk of an appreciable effect on the engine power; (ii) when the manufacturer requests that this should be done. In other cases, an equivalent system may be installed provided the pressure measured does not differ by more than 1 000 Pa from the upper limit specified by the manufacturer.
If an exhaust system brake is incorporated in the engine, the throttle valve shall be fixed in the fully open position.
The fuel feed pressure may be adjusted, if necessary, to reproduce the pressure existing in the particular engine application (particularly when a ‘fuel return’ system is used).
The cooling-liquid circulation shall be operated by the engine water pump only. Cooling of the liquid may be produced by an external circuit, such that the pressure loss of this circuit and the pressure at the pump inlet remain substantially the same as those of the engine cooling system.
The thermostat may be fixed in the fully open position.
When the cooling fan or blower is fitted for the test, the power absorbed shall be added to the results, except for cooling fans of air cooled engines directly fitted on the crankshaft. The fan or blower power shall be determined at the speeds used for the test either by calculation from standard characteristics or by practical tests.
Charge air-cooled engines shall be tested with charge air cooling, whether liquid — or air-cooled, but if the manufacturer prefers, a test bench system may replace the air cooler. In either case, the measurement of power at each speed shall be made with the maximum pressure drop and the minimum temperature drop of the engine air across the charge air cooler on the test bench system as those specified by the manufacturer.
The power for electrical or other starting systems shall be provided from the test bed.
1	Inlet system
	Inlet manifold	Yes
	Crankcase emission control system	Yes
	Air flow meter	Yes
	Air filter	Yes^f1
	Inlet silencer	Yes
2	Exhaust system
	Exhaust after-treatment system	Yes
	Exhaust manifold	Yes
	Connecting pipes	Yes^f2
	Silencer	Yes
	Tail pipe	Yes
	Exhaust brake	No^f3
	Pressure charging device	Yes
3	Fuel supply pump	Yes^f4
4	Fuel injection equipment
	Prefilter	Yes
	Filter	Yes
	Pump	Yes
5	High-pressure pipe	Yes
	Injector	Yes
	Electronic control unit, sensors, etc.	Yes
	Governor/control system	Yes
	Automatic full-load stop for the control rack depending on atmospheric conditions	Yes
6	Liquid-cooling equipment
	Radiator	No
	Fan	No
	Fan cowl	No
	Water pump	Yes^f5
	Thermostat	Yes^f6
7	Air cooling
	Cowl	No^f7
	Fan or Blower	No
	Temperature-regulating device	No
8	Pressure charging equipment
	Compressor driven either directly by the engine and/or by the exhaust system	Yes
	Charge air cooler	Yes ^f8
	Coolant pump or fan (engine-driven)	No
	Coolant flow control device	Yes
9	Auxiliary test-bed fan	Yes, if necessary
10	Anti-pollution device	Yes
11	Starting equipment	Yes or test bed equipment^f9
12	Lubricating oil pump	Yes
13	Certain auxiliaries whose definition is linked with the operation of the non-road mobile machinery and which may be mounted on the engine shall be removed for the test. The following non-exhaustive list is given as an example: (i) air compressor for brakes (ii) power steering compressor (iii) suspension compressor (iv) air-conditioning system.	No

Annotations

Footnotes

f1

The complete inlet system shall be fitted as provided for the intended application:

(i)

where there is a risk of an appreciable effect on the engine power;
(ii)

when the manufacturer requests that this should be done.

In other cases, an equivalent system may be used and a check should be made to ascertain that the intake pressure does not differ by more than 100 Pa from the upper limit specified by the manufacturer for a clean air filter.

f2

The complete exhaust system shall be fitted as provided for the intended application:

(i)

where there is a risk of an appreciable effect on the engine power;
(ii)

when the manufacturer requests that this should be done.

In other cases, an equivalent system may be installed provided the pressure measured does not differ by more than 1 000 Pa from the upper limit specified by the manufacturer.

f3

If an exhaust system brake is incorporated in the engine, the throttle valve shall be fixed in the fully open position.

f4

The fuel feed pressure may be adjusted, if necessary, to reproduce the pressure existing in the particular engine application (particularly when a ‘fuel return’ system is used).

f5

The cooling-liquid circulation shall be operated by the engine water pump only. Cooling of the liquid may be produced by an external circuit, such that the pressure loss of this circuit and the pressure at the pump inlet remain substantially the same as those of the engine cooling system.

f6

The thermostat may be fixed in the fully open position.

f7

When the cooling fan or blower is fitted for the test, the power absorbed shall be added to the results, except for cooling fans of air cooled engines directly fitted on the crankshaft. The fan or blower power shall be determined at the speeds used for the test either by calculation from standard characteristics or by practical tests.

f8

Charge air-cooled engines shall be tested with charge air cooling, whether liquid — or air-cooled, but if the manufacturer prefers, a test bench system may replace the air cooler. In either case, the measurement of power at each speed shall be made with the maximum pressure drop and the minimum temperature drop of the engine air across the charge air cooler on the test bench system as those specified by the manufacturer.

f9

The power for electrical or other starting systems shall be provided from the test bed.