Emissions requirements will change in 1990s
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• In the 1980s introduction of engines with more retarded injection timing to meet more stringent emission and performance requirements resulted in changed combustion by-products entering the engine oil. Excessive oil contamination by these combustion by-products caused rapid wear of heavily loaded valve and injector train components.
Resulting loose overhead setting caused the engine timing to become more retarded increasing the production of these combustion by-products and wear. Excessive oil contamination and subsequent overhead wear, instead of crown land deposit accumulation, became the controlling factor in determining proper maintenance intervals for these engines.
In the 1990s, particulate emission requirements will result in significantly changed combustion by-products entering the engine oil. Low sulphur content diesel fuels will offer significant advantages in controlling particulate emissions. Both will impact engine oil formulations and maintenance intervals in North America.
• by Donald P Carver, project manager consumables, Cummins Engine Co, on lubrication and today's diesels.