Installation Procedure
Install the intake camshaft (1) and camshaft actuator (2).
- CAUTION:
Refer to Fastener Caution .
Align and install camshaft actuator locking tool (2) EN 50793 into the slots of the intake camshaft actuator and mount tool to engine front cover assembly and tighten the bolts (1) to 10 N.m (89 lb in).
Install a NEW camshaft actuator bolt (1) and tighten to 30 N.m (22 lb ft) plus 100 degrees.
- Lift and roll intake camshaft assembly from exhaust camshaft position over into original position.
- NOTE:
Apply lubricant to all lobes and journals prior to installing the camshafts.
Set the intake camshaft on top of the roller followers in the camshaft bearing journals with the intake actuator timing mark at approximately the 11 O'clock position.
- Install the camshaft cap bolts (1, 3) into the camshaft caps (2, 4).
- Install the camshaft caps (2, 4) and hand start the camshaft cap bolts (1, 3).
Install the exhaust camshaft (1) and camshaft actuator (2).
Align and install camshaft actuator locking tool (2) EN 50793 into the slots of the intake camshaft actuator and mount tool to engine front cover assembly and tighten the bolts (1) to 10 N.m (89 lb in).
Install a NEW camshaft actuator bolt (1) and tighten to 30 N.m (22 lb ft) plus 100 degrees.
- NOTE:
Apply lubricant to all lobes and journals prior to installing the camshafts.
Set the exhaust camshaft on top of the roller followers in the camshaft bearing journals with the exhaust actuator timing mark at approximately the one O'clock position.
- Install the camshaft cap bolts (1, 3) into the camshaft caps (2, 4).
- Install the camshaft caps (2, 4) and hand start the camshaft cap bolts (1, 3).
Install the front camshaft bearing cap (1). Install the timing chain guide (2) onto the front camshaft bearing cap, then hand start the camshaft cap bolts (3 - 5).
-
NOTE:
During the tightening sequence, locate and tighten each camshaft cap bolt installed into the circular hole first. Then, tighten the bolt installed into the slotted hole.
Tighten the camshaft cap bolts in sequence using the following procedure:
- Tighten the camshaft cap bolts in sequence to 8 N.m (71 lb in).
- Loosen both bolts in each cap in sequence to 180 degrees.
- Tighten the camshaft cap bolts in sequence to 10 N.m (89 lb in) twice.
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Courtesy of GENERAL MOTORS COMPANY
Tighten the front camshaft cap bolts in sequence to 10 N.m (89 lb in) twice.
Remove EN-50656 timing chain holding tool (1).
Remove the EN-50793 holding tool (2).
- Install the high pressure fuel pump. Refer to Fuel Pump Replacement .
- Install the camshaft cover. Refer to Camshaft Cover Replacement .
To properly position the camshaft caps, install the camshaft cap bolts into the camshaft caps prior to installing the camshaft caps on the camshafts.
To properly position the camshaft caps, install the camshaft cap bolts into the camshaft caps prior to installing the camshaft caps on the camshafts.