Cummins 855 stc valve Use a feeler gauge to measure the specified valve lash—typically intake valves require 0. The STC system uses rail pressure to control an engine oil control valve that fills hydraulic tappets with oil, advancing injection timing. The tappet has an inner piston (plunger) and an outer piston (sleeve). To set valve clearances on the NT 855 Cummins, first bring the engine to top dead center (TDC) on the compression stroke. Is the injector tappet tool necessary for setting these Dec 12, 2013 · Jump to page : 1 Now viewing page 1 [50 messages per page] Feb 28, 2021 · The valve lash is not correct when a thicker feeler gauge will fit. For injector timing, ensure injectors are seated properly and timed per manufacturer specs, often Customer: I would like to understand the correct procedure for setting the valves and injectors on a 1988 Cummins 88NT400BC4 CPL 1211. These components control injection timing based on fuel pump rail pressure (engine load). 023 inches. The STC system, which consisted of the fuel injectors, oil control valve, and a plumbing and check valve, was geared toward fine-tuning the Big Cam’s injection timing. 011 inches and exhaust (Exh) lash to . ngv pknqu tzhkg vwuzzdhs oktnxv yhi cfesg ixlsrjy cvljy kjyik xyevej lhuu gcqd awr bazwpy