Camshaft Timing Chain Installation

Special Tools

• EN-50513  Tensioner Pin
• EN-51148  Camshaft Holding Tool

For equivalent regional tools, refer to Special Tools .

1. Adjust the engine to top dead center (TDC). Refer to Camshaft Timing Chain Inspection .
2. The EN-51148  holding tool must be installed to the camshafts and to the cylinder head.
3. Install the timing chain (1) along with the crankshaft sprocket (2) and the cam (3).
   Fig 1: Timing Chain And Crankshaft Sprocket

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: The cam (3) and the groove at the crankshaft (4) must be in line.
   NOTE: Mind the chain marks.
4. Ensure that the colored link (3) match to the arrow on the oil pump.
   Fig 2: Timing Chain Marks

   Courtesy of GENERAL MOTORS COMPANY
5. Ensure that the colored links (1, 2) match to the marks on the camshaft position adjuster actuators.
6. Install the timing chain tensioner (1).
   Fig 3: Timing Chain Tensioner

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7. Install the 2 timing chain tensioner bolts (2) and tighten to 10 N.m (89 lb in).
   CAUTION: Refer to Fastener Caution .
8. Push the timing chain guide - left side (2) in the direction of the arrow.
   Fig 4: Timing Chain Guide And Tensioner

   Courtesy of GENERAL MOTORS COMPANY
9. Remove the EN-50513  tensioner pin (3) from the tensioner (1).
10. Install the upper timing chain guide (1).
    Fig 5: Upper Timing Chain Guide

    Courtesy of GENERAL MOTORS COMPANY
11. Install the upper timing chain guide bolts (2) and tighten to 7 N.m (62 lb in).