C Yukon 2WD V8-5.7L VIN R (1999)
Connecting Rod: Specifications
Second Design Connecting Rod Bolt & Torques
Bulletin No.: 99-06-01-011
Date: June, 1999
SERVICE MANUAL UPDATE
Subject:
Second Design Connecting Rod Bolt and Torque Specification
This bulletin is being issued to revise the Fastener Tightening Specifications and the Piston, Connecting Rod, and Bearing Installation procedures. A
second design connecting rod bolt will be introduced for the 1999 model year. Either design bolt, (when used in pairs and properly tightened) may be
used with 1997-99 connecting rods. Add the second design bolt description and torque specifications to the appropriate Service information.
Identify the type of connecting rod bolt.
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The first design connecting rod bolt (1) can be identified by a single dimple/mark on the head of the bolt and no retaining sleeve (3) on the bolt
shank.
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The second design connecting rod bolt (2) can be identified by two dimples/marks on the head of the bolt and a retaining sleeve (3) on the bolt shank.
Important:
When replacing the connecting rod bolts, both bolts MUST be of the same design for each connecting rod assembly. The use of different design
connecting rod bolts on the same connecting rod may lead to uneven clamp-loads and/or connecting rod bearing bore distortion.
Install the bearing, cap, and bolts.
Tighten
^
Tighten the first design bolts:
First pass evenly to 20 Nm (15 lb ft). Final pass to 60 degrees using the J 36660.
