Replace these if bent or worn. Check crank for damage first. (includes upper bushing)

Crankcase Ball Bearing, front end-cap.

If your crank is grooved, replace it to ensure that your rebuild will not be in vain. If there are only surface deposits of aluminum from the bearings, then remove them with a soft wire brush and then polish your crank.

Includes piston, rings, piston pin & snap rings.

Aluminum Block Manifold (5-way).

Rolair Motor Pulley Groove: Single-A Bore: 3/4" Outside Diameter: 4-5/16" Specifications Model Number/ Cross Reference: 4090HK17, 6590HK18,5GR30HK17, RC4HK12 Groove: Single-A Bore: 3/4" Outside Diameter: 4-5/16"