Ingersoll Rand — FA2.5 Motor (K5B) Assembly

Repair & overhaul · FA2.5 air motor

From a Ingersoll Rand service manual — check it applies to your exact model before use.

Procedure

1. Assemble throttle valve assembly, gasket and exhaust flange to rotary valve housing; tighten capscrews to 25 ft lbs (3.5 kgm).
2. Press bearing onto the rear of the rotary valve, pressing only on the inner race.
3. Install the rotary valve, seal ring, 'O' ring and rotary valve housing gasket.
4. Install the motor housing onto the rotary valve housing; tighten capscrews to 50 ft lbs (7 kgm).
5. Press the crank bearing on the crank assembly, applying pressure only on the inner race.
6. Slide the sleeve, connecting rod bushing and first connecting rod ring over the crankpin.
7. Install the connecting rods in the same order as removed with all feet pointing the same direction.
8. Slide the crank shaft valve end over the crankpin while aligning the tang with the slot.
9. Install lock pin (235) and pin nut (237); torque the nut to 60 ft lbs (8.3 kgm).
10. Install roll pin (240) and bearing (228) into the valve end of the crank shaft.
11. Position the crank assembly into the motor housing with bearing seated and rods centered in cylinder holes.
12. Position a connecting rod at top of stroke and install piston with rings, wrist pin and retaining rings.
13. Install new cylinder head gaskets and cylinder liners using a single band ring compressor.
14. Install cylinder heads and torque capscrews to 60 ft lbs (8.3 kgm).
15. Install mounting flange and gasket with notches aligned; install eye bolts and vent cap assemblies.

Source: Ingersoll Rand service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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