Ingersoll Rand — FA2 Motor Assembly

Repair & overhaul · FA2 air motor

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

Procedure

1. Press bearing onto the crankshaft counterbalance.
2. Place the connecting rods on the bushing and hold them with the two connecting rod rings, chamfered side next to the rod.
3. Place the sleeve on the crankshaft, then install the connecting rod assembly.
4. Secure the crankshaft counterbalance with the taper pin and tighten the capscrew.
5. Attach the rotary valve housing and valve cover with at least two capscrews to locate bearing.
6. Align bearing in the motor housing bore and tap the crankshaft assembly in place.
7. Check ring fit with a feeler gauge and measure the ring gap.
8. Install oil rings and compression rings in their grooves; plain compression ring nearest the piston head.
9. Stagger ring joints so they do not coincide with wrist pin openings.
10. Rotate the crankshaft and insert the wrist pin through the piston and connecting rod.
11. Install a gasket and cylinder over each piston; the cylinder has tapered ears that act as ring compressors.
12. Secure the cylinders to the motor housing with capscrews and lockwashers.
13. Install rotary bushing and rotary valve in the adapter valve, aligning drive pins with the crankshaft.
14. Replace the exhaust cap and secure with capscrews and lockwashers.

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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