Ingersoll Rand ST999CP03R25S turbine air starter – ST900, 99% arc, SAE 3 flange, 11T pinion DP 6/8, right-hand rotation

Ingersoll Rand ST999CP03R25S is an ST900 series pre-engaged turbine air starter for starting diesel and gas engines in marine, power generation, oil & gas and off-highway applications. Power up to 66 hp (49 kW) and breakaway torque 420 Nm at 6.2 bar.

Exhaust S: straight exhaust (no elbow), standard position. The orientation only defines how the starter sits on the engine (inlet, exhaust and drive housing positions). The starter itself is the same as other ST999CP03R25 variants – choose the one that fits your engine installation, or ask us.

  • turbine
  • 99% arc
  • gear ratio C
  • pre-engaged
  • SAE 3 flange
  • 11-tooth pinion, DP 6/8
  • right-hand rotation
Other versions in the ST900 seriesCompare all in a table →
ModelST950 · 50% arcST999 · 99% arc
Gear ratioBC
RotationLeft-handRight-hand
ExhaustElbowStraight (S)
Orientation0I3AStandard
Orientation diagram
Rear view – inlet and exhaustRear view – inlet and exhaust0123SFlange view – drive housingFlange view – drive housingABCDEFGHIJKLMNOP

Standard orientation – positions are confirmed at order to suit your engine.

Positions per the Ingersoll Rand installation manual: inlet and exhaust 4 × 90°, drive housing 16 × 22.5°. The drive housing letter shows the position of the control ports (reference hole on inertia models). Always check against your engine installation drawing.

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