GM: Electra/Park Avenue/Ninety-Eight 1990-1993

Cylinder Head

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Fig. Fig. 1 Cylinder head bolt tightening sequence



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Fig. Fig. 2 Checking cylinder head flatness



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Fig. Fig. 3 Checking cylinder head resurfacing

REMOVAL & INSTALLATION



Left Side (Front)
  1. Disconnect the negative battery cable and remove the air cleaner assembly. Relieve the fuel system pressure as outlined earlier in this Section, just before `Engine Removal and Installation.'
  2.  
  3. Drain the cooling system and remove the intake manifold.
  4.  
  5. Remove the valve covers and remove the rocker arm assemblies and push rods, keeping everything in order.
  6.  
  7. Disconnect the torque strut from the bracket at cylinder head.
  8.  
  9. Disconnect the vacuum line from the transaxle.
  10.  
  11. Remove the left exhaust manifold.
  12.  
  13. Disconnect the spark plug wires and remove the spark plugs.
  14.  
  15. Remove the alternator front mount bracket and ignition module with bracket.
  16.  
  17. Remove the cylinder head bolts in the reverse order of installation, and remove the cylinder head.
  18.  
  19. Clean all gasket mating surfaces and the cylinder head bolt holes in the block.
  20.  

To install:

  1. Place the cylinder head gasket on the engine block dowels with the note THIS SIDE UP facing the cylinder head and the arrow facing the front of the engine.
  2.  
  3. Install the cylinder head bolts and tighten as follows:
  4.  
    1. Tighten the cylinder head bolts, in sequence, to 35 ft. lbs. (47 Nm).
    2.  
    3. Rotate each bolt 130°, in sequence.
    4.  
    5. Rotate the center 4 bolts an aditional 30°, in sequence.
    6.  

  5. Install the push rods, rocker arm assemblies and valve covers.
  6.  
  7. Install the intake and exhaust manifolds.
  8.  
  9. Install the alternator front mount bracket and ignition module with bracket.
  10.  
  11. Install the spark plugs and wires.
  12.  
  13. Install the torque strut to the bracket, at the head and torque to 41 ft. lbs. (55 Nm).
  14.  
  15. Fill the cooling system, connect the negative battery cable and install the air cleaner assembly.
  16.  

Right Side (Rear)
  1. Disconnect the negative battery cable and remove the air cleaner assembly. Relieve the fuel system pressure as outlined earlier in this Section, just before `Engine Removal and Installation.'
  2.  
  3. Drain the cooling system and disconnect the exhaust crossover pipe.
  4.  
  5. Remove the intake manifold.
  6.  
  7. Raise and support the vehicle safely.
  8.  
  9. Disconnect the front exhaust pipe from the manifold.
  10.  
  11. Remove the valve covers.
  12.  
  13. Remove the belt tensioner pulley.
  14.  
  15. Disconnect the heater hose from the engine.
  16.  
  17. Remove the power steering pump mounting bracket and lay the pump to 1 side.
  18.  
  19. Remove the spark plug wires and remove the spark plugs.
  20.  
  21. Disconnect the exhaust manifold and leave in place.
  22.  
  23. Disconnect the electrical connection from the oxygen sensor.
  24.  
  25. Remove the rocker arm assemblies and push rods, keeping everything in order.
  26.  
  27. Remove the cylinder head bolts in reverse order of installation and remove the cylinder head.
  28.  
  29. Clean all gasket mating surfaces and the cylinder head bolt holes in the block.
  30.  

To install:

  1. Place the cylinder head gasket on the engine block dowels with the note THIS SIDE UP facing the cylinder head and the arrow facing the front of the engine.
  2.  
  3. Install the cylinder head bolts and tighten as follows:
  4.  
    1. Tighten the cylinder head bolts, in sequence, to 35 ft. lbs. (47 Nm).
    2.  
    3. Rotate each bolt 130°, in sequence.
    4.  
    5. Rotate the center 4 bolts an additional 30°, in sequence.
    6.  

  5. Connect the electrical connection to the oxygen sensor.
  6.  
  7. Install the exhaust manifold and intake manifold.
  8.  
  9. Install the push rods and rocker arm assemblies.
  10.  
  11. Install the valve cover.
  12.  
  13. Install the spark plugs and wires.
  14.  
  15. Install the power steering pump bracket and torque the bolts to 37 ft. lbs. (50 Nm).
  16.  
  17. Install the belt tensioner pulley.
  18.  
  19. Install the heater hose to the engine.
  20.  
  21. Install the exhaust crossover pipe.
  22.  
  23. Raise and support the vehicle safely.
  24.  
  25. Install the front exhaust pipe to the manifold and lower the vehicle.
  26.  
  27. Fill the cooling system, connect the negative battery cable and install the air cleaner assembly.
  28.  

CLEANING & INSPECTION



Chip chunks of carbon away from the valve heads, combustion chambers, and ports, using a chisel made of hardwood. Remove the remaining deposits with a stiff wire brush.


WARNING
do not use a steel wire brush to clean this aluminum cylinder head; special-purpose brushes are sold just for use on aluminum. Always wear eye protection when grinding chipping or wire brushing.

Be sure that the deposits are actually removed, rather than just burnished. Have the cylinder head hot-tanked to remove grease, corrosion, and scale from the water passages. Clean the remaining cylinder head parts in an engine cleaning solvent, but be sure not to remove the protective coating from the springs.

RESURFACING



All machine work should be performed by a competent, professional machine shop.

To judge whether milling is needed, place a straightedge across the gasket surface of the cylinder head. Using feeler gauges, determine the clearance at the center of the straight edge. If warpage exceeds 0.003 inch (0.076mm) in a 6 inch (152mm) span, or 0.006 inch (0.152mm) over the total length, the cylinder head should be resurfaced.

When milling the cylinder heads of V-type engines, the intake manifold mounting position is altered, and must be corrected by milling the manifold flange a proportionate amount.

 
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