Close Arriva Bus & Coach Vehicles New Coaches Buses Used Coaches Buses Brands Van Hool Temsa MCV Wrightbus VDL DAF Paccar Find the right vehicle from our extensive range of new and used vehicles and choose whether you want to buy, rent or finance. Outstanding after sales and parts support come as standard Rentals Finance Parts Braking Braking Transmission Systems Transmission Systems Engine Components Engine Components Steering & Suspension Steering & Suspension Exhaust Systems Exhaust Systems Body Accessories Body Accessories Service Field Service Field Service Air Conditioning Air Conditioning Accident Repairs Accident Repairs Diagnostics Diagnostics MOT MOT Training Training Offers Blog About Contact 01274 681144Search Latest from the Blog Browse by Category After Sales Advice Product Reviews Customer Deliveries Business Updates Industry News Safety Checks - After Treatment Systems 24th November 2014 Recent changes in emissions legislation have driven manufacturers to develop cleaner and more efficient engine systems. This could take the form of an EGR (Exhaust Gas Recirculation) or an SCR (Selective Catalytic Reduction). The SCR system essentially consists of a catalyst (CAT) in the exhaust system and a means dosing metered amounts of urea (Adblu) into the CAT. A reaction takes place that ultimately reduces the amount of NOx emitted from the exhaust. A typical system requires an awareness of the basic function and some special considerations in owning and operating a bus or coach with such a system. The cleanliness of the Adblu itself is critical to the operation of the system; the metering device (Dosing Unit) is sensitive to pollutants or particulate matter. Diesel in particular can ultimately damage the CAT too, therefore care when filling or choosing a decanting method is required. A dedicated container for Adblu should never be used for screen wash, fuel cleaning products or any other liquid. Care should always be taken when storing Adblu liquid. The dosing system is generally air controlled and includes in-line air filters that require maintenance. Adblu, if exposed to the outside atmosphere in the form of a leak, is prone to natural crystallisation, this can create blockages in the dosing system if not maintained properly. Always look out for signs of this crystallising effect as it usually indicates a leak in the system. The Adblu line also has a filter gauze which should be clear of debris or crystallised Adblu. A block in this filter would cause the system to default and cease delivery of Adblu, resulting in zero Nox reduction and a fault in the system. It would also de-rate the engine to 60% torque. As with many modern electronically controlled systems a dashboard warning light is usually the first indication that the system has a fault, specialist diagnostic tools will direct you to the source of the problem and get the vehicle back on the road as soon as possible. ArrowPrev PostNext PostArrow Recent Posts Apr 24, 2015 Striking Astromega for Johnson Brothers Read more Apr 08, 2015 Can onboard wifi improve passenger numbers and experience? Read more Mar 24, 2015 Another DAF Van Hool for Fishwicks Read more F L Arriva Arriva Bus and Coach Ltd. 2014 Registered in England 1075050 Registered Office Admiral Way Doxford International Business Park, Sunderland, SR3 3XP A subsidiary of ARRIVA Plc. Arriva Vehicles New Coaches New Buses Used Coaches Used Buses Search Vehicles Services Offers Rental Parts Servicing Finance Support About Us Contact Us Blog Privacy Policy Terms of Service Contact Lodge Garage, Whitehall Road, Cleckheaton, W. Yorks, BD19 4BJ Sales: 01274 681 144 busandcoachsales@arriva.co.uk Parts: 01274 686 707 busandcoachparts@arriva.co.uk Contact us online. © Copyright Arriva Bus and Coach Ltd. 2015 • Built by Parallax