Camshaft Sprocket Fastening

Install EN-49977-200 fixing tool (2) and ensure that the gearing of the fixing tool engages with the intake camshaft sprocket gearing (1).

Fig 1: Intake Camshaft Sprocket Gearing And Special Tool
Courtesy of GENERAL MOTORS COMPANY

NOTE: Push the fixing tool in the direction of the arrow to ensure it fully engages.
Tighten the 2 fastening bolts (1) of EN-49977-200 fixing tool while pushing the fixing tool in direction of the arrow.

Fig 2: Adjuster Bolt And Fastening Bolts
Courtesy of GENERAL MOTORS COMPANY
Tighten the adjuster bolt (2).
Install EN-49977-100 transmitter disc holder (2) to find and hold the correct position of the camshaft position exciter wheels.

Fig 3: Fastening Bolts And Fixation Tool
Courtesy of GENERAL MOTORS COMPANY

NOTE: A wrong installation position is possible. Make sure that the holding tool is fully installed to the cylinder head in areas (3) and (5).
Tighten the fastening bolts (6) of EN-49977-100 transmitter disc holder.
Tighten the NEW intake camshaft sprocket bolt (4) while holding the hexagon (1) of the intake camshaft to 50 N.m (37 lb ft).
CAUTION: Refer to Fastener Caution .

CAUTION: Refer to Torque-to-Yield Fastener Caution .
Tighten the intake camshaft sprocket bolt (4) while holding the hexagon (1) of the intake camshaft to an additional 60 degrees.
Tighten the NEW exhaust camshaft sprocket bolt while holding the hexagon of the exhaust camshaft to 50 N.m (37 lb ft).
Tighten the exhaust camshaft sprocket bolt while holding the hexagon of the exhaust camshaft to an additional 60 degrees.
Remove EN-49977-100 transmitter disc holder and EN-49977-200 fixing tool.