What is a Cummins STC injector?

Step Timing Control, commonly referred to as STC, controls the engine timing in an effort to minimize white smoke at cold engine start-up.

What is an STC injector?

STC, short for Step Timing Control, controls the engine timing in an effort to minimize white smoke at cold engine start-up. … The engine operates in the ADVANCED mode of injection timing during starting and light load conditions and at NORMAL timing during medium to high load conditions.

How do you adjust injectors on a ISM Cummins?

Loosen the injector adjusting screw locknut. Use a screwdriver or a box end wrench, if equipped with engine brakes) to adjust the screw. Bottom the injector plunger three or four times to remove the fuel. Turn the adjusting screw in until it just bottoms the plunger.

How does Cummins STC work?

The STC control valve uses fuel pressure and spring force to control the position of an AFC style plunger. The position of the plunger dictates whether the oil passage to the hydraulic tappets is open or closed. Fuel pressure acts on the piston end of the plunger.

How does a Cummins PT pump work?

The fuel pump turns at engine speed. … The fuel-metering process in the Cummins PT fuel system has three main advantages: The injector accomplishes all metering and injection functions. The injector injects a finely atomized fuel spray into the combustion chamber at spray-in-pressures exceeding 20,000 psi.

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How do you adjust the valves on a Cummins M11?

Hold the adjusting screw, and tighten the locknut. After setting the injector, set the valves on the same cylinder. With the “A” valve set mark aligned with the pointer on the gear cover and both valves closed on the cylinder to be adjusted, loosen the adjusting screw locknuts on the intake and exhaust valves.

How do you adjust the injectors on a n14 Cummins?

If your engine has electronic injectors that is correct way to set. Tighten the adjusting screw on the injector rocker lever until the timing plunger just touches bottom.

Alternately tighten the rocker shaft capscrews:

  1. Tighten to 54 N•m [40 ft-lb]
  2. Tighten to 108 N•m [80 ft-lb]
  3. Tighten to 156 N•m [115 ft-lb]


How many liters is a Cummins M11?

The Cummins M-series engine is a straight-six diesel engine designed and produced by Cummins. It displaces 10.8 litres (659.1 cu in).

Cummins M-series engine
Production 1994-2010 (M11, M11 CELECT, ISM) 1994-present (ISMe)
Configuration Straight six diesel engine

What is a top stop injector?

A Top Stop injector has the injector travel set within the injector, and this is done by the injector rebuilder. … This involves torqueing the injector screw to a given value with the injector plunger at its maximum travel, and bottomed in the cup. This is known as the “Outer Base Circle” or OBC method.