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.

Courtesy of GENERAL MOTORS COMPANY

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)

Courtesy of GENERAL MOTORS COMPANY

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

6. Courtesy of GENERAL MOTORS COMPANY

   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)

7. Courtesy of GENERAL MOTORS COMPANY

   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.