Ingersoll Rand — FA2.5 Motor (K5B) Disassembly

Repair & overhaul · FA2.5 air motor

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

Procedure

1. Remove the five capscrews from the exhaust flange; do not remove the two throttle valve assembly capscrews.
2. Pull the rotary valve housing out of the motor housing as an assembly with the exhaust flange.
3. Remove the rotary valve through the motor housing end of the rotary valve housing.
4. Remove exhaust flange and throttle valve assembly by removing their capscrews.
5. Remove each cylinder head by removing four capscrews; remove head gasket.
6. Remove mounting adapter by pulling it straight off.
7. Pull the cylinder liner straight out.
8. Position the piston at top of stroke, remove one retainer ring and push the wrist pin out by hand.
9. If the wrist pin is too tight, carefully heat the piston to 200 F (93 C) or less.
10. Remove the remaining cylinder liners and pistons; all must be removed to take out the crank assembly.
11. Remove the crank assembly with the oil slinger by pulling straight out of the motor housing.

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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