GM 24100366 Camshaft, Exhaust (Machining)

In any case of a camshaft replacement, it is recommended to replace the Lash Adjusters also. It is recommended that old Lash Adjusters should not be used on a new camshaft. Starting from the electricity, remove the cable, release the pressure of the fuel system as well as the removal of the radiator. If installed, then slide out the auxiliary automatic transmission fluid cooler and disconnect power steering cooler. Second it will be necessary to come to an end the removal of the air conditioning condenser, a valve, the upper head, the intake manifold with the heads of bolts, the hydraulic Lash Adjusters, the pushrods, the timing chain, the sprockets fastened to the engine bulkhead, and heads of the cylinders. When it is time to remove the Lash Adjusters provide for the reception in a marked box so that they can be placed in the right position after repair. Lash Adjuster retainers and Lash Adjusters should be removed and it is important to ensure they are clean, it should also be noted that each of the retainers contains four separate Lash Adjusters which must be replaced back in the same positions if they are to be re-used. If for some reason the Lash Adjusters got stuck due to the build up of gum and or varnish various methods of extraction can be used, such as with the aid of an L.H. tool, a small magnet or machinist's scribe. Pliers should not be used except when Lash Adjusters are to be replaced as this can cause damage to them. Unbolt the camshaft retainer plate and the camshaft, and note the direction of the plate as it faces the block; thread a bolt in the sprocket hole of the camshaft where the old bolt is removed to serve as a camshaft handle. With caution and gradual force remove the camshaft out, while holding it close to the block to avoid causing problems to the bearings. Estimate the camshaft lobe height and base circle to understand the lift of the lobe and write the figures for future use. Following the lobe lift check, check it with the specified figures; should the lobe lift be 0.02 inches below the specified figure then cam lobe wear has taken place and the car will probably require a new camshaft. It is proper to check out the bearing journals for wear and damage and then measure them across their diameter with a view of identifying excessive wear or out-of-round situations after cleaning the camshaft. Finally examine the camshaft lobes for any discoloration, for signs of score marks or uneven wear; if the lobes are healthy the camshaft can be used again. Lash Adjusters should also be cleaned and inspected for signs of wear especially on part that rotates in the form of rollers which should be without or with minimal end play. roller Lash Adjusters, once used cannot be replaced with a new camshaft and therefore when using a new camshaft, always use new Lash Adjusters. As for the installation, before that, the camshaft bearing journals and lobes should be lubricated, and then the camshaft is to be inserted into the engine with the help of a supporting block near the block. Rotate the camshaft in a way that the dowel pin is placed at the '3' mark, put the camshaft thrust plate and fasten all the bolts to the recommended torque. Replace the timing chain and sprockets and also the camshaft position sensor, new O-ring ought to be used for this installation. Lightly coat the Lash Adjusters with fresh engine oil and then fitting them again in lift retainers in a precise manner. There are usually reusable/replaceable Lash Adjusters and because of this, the retainer and the Lash Adjusters should be installed together into the engine block with the original Lash Adjusters being placed in their respective locations again. Torque the Lash Adjuster retainer bolts to the manufacturer recommended torque then to complete the procedure reverse the whole process. Ensure usage of sufficient coolant before the engine is on, replace engine oil and fit a new oil filter.

A special camshaft holding tool (GM# J-44221 or equivalent) is required for this procedure. After removing the cam sprocket, do not rotate the crankshaft to avoid incorrect timing and potential engine damage. Begin by removing the valve cover and the spark plugs to facilitate engine rotation. Rotate the engine until the sprocket alignment marks are aligned with a dark chain link, ensuring the nats at the rear of the camshafts are facing up. Remove the camshaft sprocket bolts and carefully detach the sprockets from the camshafts, taking care not to remove them from the chain and suspending them to prevent the chain from coming off the crankshaft sprocket. Check the camshaft caps for markings and mark them with paint if necessary before removal. Remove the camshaft cap bolts gradually until they can be taken out, then extract the camshafts, keeping them separated to avoid mixing them up. The rocker arms and lash adjusters can be lifted out if needed, and these parts should be laid out in order for reinstallation. After cleaning the camshafts, inspect each for scored journals, heat discoloration, score marks, chipped areas, pitting, uneven wear, damaged locator pin slots, and damaged threads. Measure the bearing journals with a micrometer to check for excessive wear or out-of-round conditions. Compare the camshaft lobe heights by measuring each lobe with a micrometer, recording the measurements for both intake and exhaust lobes separately; if the difference exceeds 0.005 inch, the camshaft should be replaced. If removed, soak the lash adjusters and rocker arms in clean engine oil before reinstalling them in their original locations. Coat the camshaft with clean engine oil and place it in the correct position in the cylinder head, then install the camshaft holding tool. Install all camshaft caps in their original locations and hand tighten them, then evenly tighten the caps to the specified torque, working from the center out. Remove the holding fixture, place the sprockets onto the camshafts, and tighten the bolts to the specified torque. Using a large breaker bar and socket on the crankshaft pulley bolt, rotate the crankshaft 720 degrees and re-check the sprocket and chain alignment, ensuring the darkened links align with the sprocket marks; if resistance is felt while turning the crankshaft, stop immediately to diagnose the issue. Finally, install the spark plugs and the valve cover.

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