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With some minor variations, this procedure can be used on both the left and right cylinder heads. If the head is be overhauled, remove any remaining components such as the engine lift hook, the fuel line bracket bolts, the engine coolant temperature sensor, etc., as required.
The bolts should be very clean since dirt built-up on the bolt threads makes it difficult to get an accurate torque reading.
With an accurate torque wrench, tighten the bolts gradually, in sequence, working from the center outwards.
As with many procedures on the 3.4L VIN X DOHC engine, cylinder head removal is a long and complicated task.
Remove the upper and lower intake manifolds, following the procedures given in this section.
The camshaft carrier covers should have been removed as part of the timing belt removal procedure.
Remove the oil from the camshaft carrier to cylinder head bolts, the holes closest to the exhaust manifold. Remove the oil from the camshaft hold-down tool hole in the carrier before installing and tightening the bolt. The use of petroleum jelly (never chassis grease) in the lifter bores, along with the use of the lifter hold-down hoses mentioned above, will help keep the lifters in place. Install the lower and upper intake manifold following the procedures given in this section. Remove the upper and lower intake manifolds following the procedures given in this section. Remove the cylinder head bolts and carefully lift the head along with the exhaust manifold from the vehicle. Make sure that the pieces of rubber tubing are in place under the camshaft and in between the lifter to hold the lifters in carrier.
As with many procedures on the 3.5L (VIN H) DOHC engine, cylinder head removal is a long and complicated task.


Remove the left side (front) cylinder head camshafts using the procedures found in this section.
Place the valve train parts in a rack in the order in which they are being removed so that they can be installed in the same location from which they were removed.
Remove the right side (rear) cylinder head camshafts using the procedures found in this section.
Place the valve train parts in a rack in the order in which they are being removed that that they can be installed in the same location from which they were removed. These are 'torque to yield' bolts which stretch a small amount when tightened; new bolts are always recommended. Be very sure of your diagnosis before attempting to remove the heads on this engine, especially with the engine still in the vehicle. From shop stock, cut and install six pieces of rubber hose under the camshaft and between the lifters to hold the lifters in the carrier.
Use care when working with light alloy parts not to gouge or scratch the gasket sealing surfaces. Some brands of gaskets may say TOP or have some other marking indicating the surface that should face the cylinder head.
Since coolant will run down into the engine oil system when the head is removed, it is most important to drain the engine oil and refill with clean engine oil. While the head bolts must not be reused, it is good practice to note the location of each removed bolt so its correct replacement can be installed.
Make sure the locating dowel guide pins are not pulled from the engine block and stuck in the head. The head gasket must be installed with the arrow (or noting any other mark, depending on the gasket manufacturer) pointing to the front of the engine. Pull upwards on the head to disengage the pins, then remove the cylinder head to a suitable work area. On a used vehicle, especially a high-mileage vehicle, it may be difficult to determine if the heads have been removed before and how many cycles the bolts have been removed and tightened. The tool fits down on these flats to keep valve spring pressure from rotating the camshafts. Some technicians will place a replacement head gasket on a clean piece of cardboard and trace out the head bolt holes.


Place the head on a flat, clean surface with the combustion chambers face-up to prevent damage to the deck face. Failure to follow the given procedure will cause head gasket failure and possible engine damage. Installing the gasket in any other direction will cause gasket failure and possible engine failure.
It is good practice to use the proper size thread-cutting tap to clean the threaded bolt holes in the block. A pair of special tools, GM #J 38613-A Camshaft Timing Clamps, is required to hold the camshafts in place once the timing belt is removed and the head bolts loosened.
A pair of special tools, GM #J 42042 Camshaft Timing Clamps, is required to hold the camshafts in place once the timing chain is removed and the head bolts loosened. The head bolts are punched through the cardboard in their corresponding locations as they are removed.
This cleans out old sealer, rust and other debris which could interfere with getting an accurate torque reading. Use GM Sealer #1052080, or equivalent, on the threads of the head bolts and install all eight bolts, finger-tight.
Remember, the valve timing must be reset if the camshaft drive sprockets are removed from their camshafts.
This tool, when properly installed, will be fully seated on the camshaft ends with the camshaft flats parallel to the cam cover sealing surfaces.
In this way, the replacement bolts can be compared to the originals and the new replacement bolts eventually installed in their correct locations. Use the correct size thread cutting tap, but use care since the engine block is also aluminum.
In addition, the factory specifies new service replacement head bolts of the correct part number be used. In addition, the factory recommends new service replacement head bolts of the correct part number be used.



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11.02.2016 admin



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