Piston Pin

Piston pin is press fit in connecting rod and must be pressed out using suitable mandrels, support and an arbor press. Place piston on support with letter "F" or notch up and press out piston pin. Separate piston from connecting rod and clean all components.
Correct fit of pin in piston is.0003-.0005". If fit is.0003", pin will not fall through piston by its own weight but will push through under light hand pressure. If fit is.0005", pin will fall through by its own weight, but there should be no side clearance felt.

To assemble piston and connecting rod, oil all components. Place piston on support with letter "F" or notch up. Position rod in piston, aligning pin holes and press in piston pin. Connecting rod can be positioned in piston either way.

Fig 1: Correct Procedure to Remove Piston Pin

Courtesy of GENERAL MOTORS COMPANY

CRANKSHAFT MAIN & CONNECTING ROD BEARINGS

Engine

MAIN BEARINGS

CONNECTING ROD BEARINGS

Journal Diam.

Clearance

Thrust Bearing

Crankshaft Endplay

Journal Diam.

Clearance

Sideplay

455"

2.9993-3.0003"

⁽¹⁾.0005-.0021"

No. 3

.004-.008"

2.4988-2.4998"

.0004-.0033"

.006-.020"

⁽²⁾.002-.0034"

⁽¹⁾	Journal Nos. 1, 2, 3 & 4.

⁽²⁾	Journal No. 5.