We continually hear of modern low emission diesels having to be rebuilt at only 600,000km or less, and many stories of long periods of expensive downtime. One of the biggest issues in maintaining reliability is keeping the emission control equipment working properly.
Normally, this just means keeping everything clean and working freely. However, that's easier said than done, since Exhaust Gas Recirculation (EGR) valves can load up with soot, as can turbos, diesel particulate filters (DPF), Ad Blue injectors and sensors in the exhaust. EGR issues can also lead to severe and constricting inlet system deposits.
High temperature, high pressure common rail systems can degrade diesel creating fouling deposits that interfere with injector response and spray patterns. This can cause over-fuelling or poor combustion, which results in an increase of soot load on EGR's and DPF's. EGR valves malfunction further increasing soot related problems, which can increase the frequency of DPF auto-regeneration cycles.
Oil soot levels also become elevated, and as the problem advances piston ring deposits build, blow by increases and engine service life is shortened…often dramatically!
To achieve the optimum service life and reliability from these low emission diesels (as with all diesels), the focus should be on prevention, however Cost Effective Maintenance has demonstrated for over 30 years that there is a large window of opportunity to also correct these problems, before a rebuild is necessary. Similar principles apply to these low emission diesels as older technology ones.
- Reduce the amount of soot at its root cause…Combustion. FTC Decarbonizer, added to the diesel, acts to catalyse the combustion process, achieving a more complete fuel burn, with less soot to foul turbos, EGR's and DPF's.
- Optimise injector response and reduce in-system degradation of the diesel. CRD Fuel Enhancer firstly cleans up and keeps clean the high precision fuel system, particularly pumps and injectors. In addition, it increases fuel lubricity to reduce the frictional heat generated by pumps and injectors that result in fuel break down. The lubricity boosts also ensures that injector response (which can be several times per firing cycle) is immediate, accurate, and prevents over-fuelling.
- Clean coked up turbos, and keep them working efficiently with no drop off in boost pressure. FTC Decarboniser also catalyses the combustion of carbon, lowering the burn off temperature to around 300 deg C.
- Maintain EGR cleanliness through the use of FTC Decarboniser and/or CRD Fuel Enhancer.
- Maintain DPF cleanliness by using FTC Decarboniser, which will burn off soot downstream in the exhaust to DPFs, and eliminate the need for manual DPF cleaning. It will also clean up Ad Blue injector tips.
- Maintain low oil soot levels. FTC Decarboniser use will result in less soot production, and with cleaner piston top ring grooves, improved sealing against soot migration into the oil. Should oil soot levels become too high, as frequently happens in many low emission diesels, the engine needs to be flushed with Flushing Oil Concentrate, which is also capable of freeing severely blocked piston rings.
- Prevent air intake system deposits. Use of either FTC Decarboniser and/or CRD Fuel Enhancer is recommended to maintain clean intake systems. Where intake manifolds are heavily carboned, removal and manual cleaning is recommended, rather than use of solvents.