Measuring Connecting Rod Bearing Clearance - Using EN-43690 / EN-43690-100

EN-43690  Rod Bearing Checking Tool and EN-43690-100  Rod Bearing Checking Tool - Adapter Kit have been developed as a more accurate method to measure connecting rod bearing clearances. The instructions below provide an overview of tool set-up and usage. For more detailed information, refer to the tool instruction sheets supplied by the tool manufacturer.

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EN-43690  Rod Bearing Checking Tool

• EN-43690-20 Swivel Base (1)
• EN-43690-19 Dial Indicator (2)
• EN-43690-2 Base (3)
• EN-43690-5, EN-43690-6 Handle (4)
• EN-43690-10, EN-43690-11 Foot (5)
• 280307 Screw (6)
• EN-43690-1 Pivot Arm Assembly (7)
• EN-43690-3, EN-43690-7, EN-43690-8 Screws (8)
• 280319 Screw (9)
• 280311 Screw (10)
• EN-43690-17, EN-43690-18 Adapter (11)
• 280310 Pin (12)

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EN-43690-100  Rod Bearing Checking Tool - Adapter Kit

• EN-43690-104 Spacer (1)
• EN-43690-105 Retainer Plate (2)
• 505478 Bolt (3)
• 511341 Bolt (4)
• EN-43690-106 Retainer Plate (5)
• EN-43690-107 Cap (6)
• EN-43690-102 Foot (7)
• EN-43690-101 Pivot Arm Assembly (8)
• EN-43690-103 Adapter (9)
• 505439 Adapter (10)

1. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   The crankshaft must be secure, with no movement or rotation, in order to obtain an accurate reading.

   Rotate the crankshaft until the journal/connecting rod to be measured is in the 12 o'clock position.

2. Remove a bearing cap and bolts (1 - 4).
3. Remove the bearing half (5).
4. Insert a piece of paper, card stock onto the crankshaft journal.
5. Install the bearing half (5) and cap and bolts (1 - 4). Fastener Specifications

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   Install the following:

   1. EN-43690-2 (5)
   2. EN-43690-3 (4)
   3. EN-43690-101 (2)
   4. 280310 (3)
   5. EN-43690-5 (1)

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   Install the swivel base (1) and dial indicator (2).

8. Adjust per the manufacturers instructions and measure the connecting rod bearing clearance.

   A connecting rod with a clearance in excess of 0.076 mm (0.003 in) is considered excessive. Service components, as required.

9. Remove all components installed for the measurement procedures. Remove the paper card stock residue, and prepare for the assemble procedure.

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    CAUTION:

    This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component.

    CAUTION:

    Refer to Fastener Caution .

    NOTE:

    • The connecting rod and cap must be assembled with the mating surfaces properly aligned.
    • If re-using connecting rods, DO NOT re-use connecting rod bolts. During an installation procedure, the new connecting rod bolts can be re-tightened a maximum of 3 times.

    Install the bearing (3) and bearing cap (2).

11. Install NEW bolts (1) and tighten, using the EN - 45059  Angle Meter. Fastener Specifications