GMC 14088841 Camshaft Asm

However, if you wish to do this for any other reason, always ensure that you rotate the Crank in the normal Direction before measuring the lobe lift before pulling out the camshaft. If used with AC then release the pressure, since there is an inherent pressure in AC and then transport the refrigerant to a certified facility after wearing eye protective goggles. Remove the negative battery terminal, siphon the oil from the crankcase, and siphon the coolant while removing the radiator, if you must. If necessary, take off the condenser fan, and the pulley of the water pump. Remove the rocker arm cover, then rotate the rocker arm/nut upward till enough clearance is created between the bolt threads, and rocker arms, and pushrods. This can be done by first dropping the oil pump driveshaft assembly, then the spark plugs, and the distributor cap and rotor, then the gasket for the pushrod cover, as well as the pushrods. Subsequently, take out the valve lifters, crankshaft pulley hub, as well as the timing gear cover. Loosening of camshaft thrust plate screws and pulling out of camshaft and gear assembly must be done in a slow manner in order to avoid bearing shock. In case the gear is required to be removed, it is usually off pressed and when putting the thrust plate, care is taken not to damage the gear. Position the gear back in the camshaft by fitting the rods in place, and verify that the gear mesh has an adequate clearance if you reinstall it again. Before putting it in, use assembly lube to lubricate the camshaft lobes and journals, and then gently thread the camshaft through the block being conscious of the bearings. The position of the camshaft gear with relation to the crankshaft gear should be such that together with the marks consistent with the number four cylinder being at TDC in the firing position. Replace the thrust plate mounting screws in the camshaft and tighten it as per the recommended torque intensity and then again perform the above process in the reverse to complete the installation. Last of all, if necessary, re-charge the air conditioning system.

If the cam lobe lift is less than the specified value, it is recommended to install a new camshaft.

Carefully draw the camshaft out of the engine block slowly to prevent damage to the camshaft bearings as the journals pass through the bearing surfaces, while supporting the camshaft with one hand near the engine block.

Remove the radiator, fan, pulleys, belts, and water pump.

Reject any camshaft that does not meet the specified limits.

Remove the grille, followed by the intake manifold.

Take off the torsional damper, crankcase front cover, and camshaft sprocket/timing chain.

For Small V8, the No.1 bearing hole should have oil holes equidistant from the 6 o'clock position, with No. 2 through No. 4 positioned at 5 o'clock, and the No. 5 bearing oil hole at 12 o'clock.

If the cam lobe lift is less than the specified value, it is recommended to install a new camshaft.

For carbureted models, take out the fuel pump and pushrod, followed by the timing chain and sprocket.

Camshaft bearing replacement requires special tools and expertise, so it is advisable to take the block to an automotive machine shop for proper handling.

Always wear eye protection.