NCT Manual. - National Car Testing Service
NCT Manual. - National Car Testing Service
NCT Manual. - National Car Testing Service
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54<br />
EXHAUST SYSTEM/NOISE<br />
NATIONAL CAR TEST (<strong>NCT</strong>) MANUAL 2012<br />
Method of <strong>Testing</strong><br />
1. Examine the condition of the exhaust pipe and silencer for security and leaks.<br />
2. Assess the effectiveness of the silencer in reducing, as far as is reasonable, the noise caused by the exhaust from the engine.<br />
3. See note below. If testing is required, the following procedure must be followed:<br />
NOTES<br />
1. If the <strong>NCT</strong> vehicle inspector deems that the level of noise caused by the vehicle exhaust is excessive, the<br />
specific level of noise is to be measured. The vehicle must be moved to the sound test area. The vehicle<br />
will be required to have a level of noise less than 99dB(A) in order to pass the test.<br />
45 o ±1 o<br />
Microphone<br />
Exhaust<br />
Outlet<br />
Exhaust Pipe<br />
Silencer<br />
ITEM<br />
REASONS FOR FAILURE<br />
1 Badly mounted or liable to fall off.<br />
2 Missing or not functioning.<br />
3 Badly mounted or liable to fall off.<br />
4 Serious leaks.<br />
Exhaust Assembly<br />
5 Vehicle exhaust noise has reached or exceeded<br />
a specified level of 99dB(A).<br />
6 Possibility of fire being caused by leaks or broken components.<br />
7 Fumes entering passenger compartment.<br />
84
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