Workshop Repair and Service Manuals GMC SIERRA
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Engine Mount Inspection Engine Block Engine Mounts

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Caution:Broken or deteriorated mounts can cause misalignment anddestruction of certain drive train components. When a single mountbreaks, the remaining mounts are subjected to abnormally highstresses.

Measure the engine movement at the engine mount in order tocheck for damage to the rubber portions of the mount.Apply the park brake.Start the engine.Firmly apply and hold the primary brakes.Have an assistant stand to the side of the vehicle in orderto observe for engine movement.Slightly load the engine, shifting from drive to reverse afew times.If the engine moves more than 24-mm(0.945-in) from the rest position, in either direction,check for loose, or missing engine mount bolts in the followinglocations:Engine mount to engineEngine mount bracket to frameEngine mount to engine mount bracketIf a engine mount bolt is missing, replace the bolt.If the engine mount bolt torque is within specifications,check the condition of the engine mount.Replace the engine mount if any of the following conditionsexist:Heat check cracks cover the rubber cushion surface.The rubber cushion is separated from the metal plate of themount.There is a split through the rubber cushion.
Engine Front Cover Cleaning and Inspection Engine Block Cylinder Block Cyl Block Front Cover     Note: Do not use the crankshaft front oil seal again. Install a NEWcrankshaft front oil seal during assembly.Do not use the front cover-to-engineblock gasket again. Install a NEW gasket during assembly.Do not use the...
Camshaft Replacement Valvetrain Camshaft - part 2     Align the CMP actuator so the timing mark is in the 6-o'clock position.Install the CMP actuator-(235) and timing chain-(208). Align the hole in the faceof the CMP actuator with the locating pin on the front face of the...
Auxiliary Battery Positive Cable Replacement - Battery to Battery Relay (TP2)     Auxiliary Battery Positive Cable Replacement - Battery to Battery Relay Callout Component Name Preliminary Procedures Disconnect the battery negative cable. Refer toBattery Negative Cable Disconnection and...
Cylinder Deactivation (Active Fuel Management) System Description - part 2     Oil travels throughthe valve lifter oil manifold and engine block oil galleries andenters the inlet port-(6) of the valve lifter. When operating in V4-mode, pressurized oil forcesthe locking pins-(11) inward. The...
Exhaust Pipe Heat Shield Replacement (Exhaust Manifold Outlet Pipe-Right) Exhaust Exhaust Heat Shields     Exhaust Pipe Heat Shield Replacement Callout Component Name Warning:Refer toExhaust Service Warning. Warning:Refer toHot Exhaust System Warning. Preliminary ProceduresRaise and support the vehicle. Refer toLifting...
Engine Block Cleaning and Inspection Engine Block - part 2     Note:Cylinder wall spotting-(1) is from the induction hardening process of the top 1/3of the cylinder wall. This is normal. Clean the cylinder bores.Inspect the cylinder bores for scratches. Replace the engine if a scratch can...