(NCT) Manual 2010 - Road Safety Authority

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54 EXHAUST SYSTEM/NOISE NATIONAL CAR TEST (NCT) MANUAL 2010 Method of Testing 1. Examine the condition of the exhaust pipe and silencer for security and leaks. 2. Assess the effectiveness of the silencer in reducing, as far as is reasonable, the noise caused by the exhaust from the engine. 3. See note below. If testing is required, the following procedure must be followed: NOTES 1. If the NCT vehicle inspector deems that the level of noise caused by the vehicle exhaust is excessive, the specific level of noise is to be measured. The vehicle must be moved to the sound test area. The vehicle will be required to have a level of noise less than 99dB(A) in order to pass the test. 45 o ±1 o Microphone Exhaust Outlet Exhaust Pipe Silencer ITEM REASONS FOR FAILURE 1 Badly mounted or liable to fall off. 2 Missing or not functioning. 3 Badly mounted or liable to fall off. 4 Serious leaks. 5 Vehicle exhaust noise has reached or exceeded a specified level of 99dB(A). Exhaust Assembly 6 Possibility of fire being caused by leaks or broken components. 84
NATIONAL CAR TEST (NCT) MANUAL 2010 REAR SUSPENSION 55 Method of Testing 1. With the vehicle on the lift or pit, raise the rear of the vehicle so that the suspension hangs freely using the vehicle manufacturer’s recommended jacking points for checking rear suspension. 2. Examine axle beams, trailing arms, swinging arms, and their mounting bushes/bearings/shafts/ball joints for wear damage and distortion. 3. Check for damage or excessive corrosion of any suspension strut mounting, wear in the shaft and the condition of the bonding between the metal and flexible material in the strut support bearing. 4. For all suspension types examine the condition of wishbones, ball joints, track control arms, anti-roll bars, transverse rods, radius rods and their mounting bushes, bearings, shafts, washers or retaining devices. 5. Examine the condition of the chassis frame and body shell structure in the vicinity of suspension mounting points and suspension subframe mounting points for fractures, excessive corrosion and distortion. ITEM Axle Beam, Trailing Arm, Wishbones, Swinging Arm, Track Control Arm, Suspension Strut Anti-roll Bar, Transverse Rod, Radius Rod/Link Bushes, Ball Joints, Sliding Bushes or Swivel Joints Mounting Area Retaining or Locking Devices e.g. Split Pin, Nut, Rivet or Weld. REASONS FOR FAILURE 1 Obviously askew. 2 Mounting bushes, bearing or bearing carrier, shafts, ball joints, obviously loose, worn or insecure. 3 Cracked or damaged. 4 Mounting loose. 5 Cracked or deformed. 6 Missing or broken. 7 Excessive wear. 8 Insecure. 9 Damaged or corroded to such an extent that the security or alignment of the suspension component is affected. 10 Absent, insecure, worn or broken. 85
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(NCT) Manual 2010 - Road Safety Authority

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