BENDIX TCH-001-027 User's Manual
Contents
1. Technical Bulletin Bulletin No PRO 01 27 Effective Date 9 15 84 Cancels NA Page 1 of 1 Subject ENGINE OIL AND COMPRESSOR INLET CARBONIZATION Bendix has learned through extensive laboratory testing and fleet surveys that multiviscosity 15W40 oils can cause compressor inlet carbonization which results in slow air build up in the compressor load cycle Carbonization attributable to the use of multiviscosity oil is generally manifested by a soft sticky deposit that causes inlet valve and or unloader malfunction Commercially available multiviscosity oils vary considerably in their tendency to form these deposits Heat build up in the inlet cavity due to turbocharging aggravates the tendency to form deposits with multiviscosity oils Single viscosity oils such as SAE 30 or 40 however have been shown not to form deposits of the type described When an increase in the incidence of compressor carbonization is encountered an alternative oil type should be considered along with an investigation of the compressor cooling and induction systems
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