Pontiac 1262835 Cams, 231

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When starting to remove the camshaft and camshaft bearings in 196, 231, 252, and 350 Buick Engines, first remove the timing chain and cover. Before pulling out the radiator, unfasten the condenser if your engine is air conditioned. Next carefully dismantle hydraulic lifters to ensure no bearing surface damage while sliding the camshaft forward. The installation of a puller containing puller screw, expanding collet and back-up nut should be done for easy removal of camshaft through removal of the front bearing. Unlike other bearing, this front one can be extracted with a spacer. Reverse these steps during installation ensuring that we replace the whole set of camshaft bearings. In comparison to above mentioned instructions on removal of camshafts; for engines such as 265 or 301 Pontiac Engines which also have similar procedures like intake manifold lifter pushrod rocker arms etcetera should all be removed after removing cam shafts and shaft bearings -particularly where there is A/C in cars; evacuate the system then take away condenser. To perform this task correctly, there are specific tools that are used to remove bearings but their order is different from how they were installed. After lubricating the camshaft and aligning timing marks we put it back together with distributor in place. The rest are placed back on opposite order. Disconnection of battery; draining and taking off radiator; disassembly of different parts such as intake manifold valve lifters timing chain sprockets among others will be involved in dismantling process of these engines such as those in Oldsmobile Gasoline Engines 307,350 and 403.Very carefully extract the camshaft; replace them together with lubricating both them and the beam before reinserting it. Put distributor back while ensuring alignment with timing marks on it so that it rotates around crankshaft at proper instant when engine is running again. Assemble all pieces backwards and make sure to observe some steps and precautions. Removing the camshaft necessitates removing the injection pump drive and driven gears, intake manifold, valve lifters, then retiming of the injection pump for 263 and 350 Oldsmobile Diesel Engines. In case of air conditioning system, it should be discharged. Then remove camshaft and gears ensuring correct alignment and if necessary replace both gears. After lubricating the camshaft and bearings slide it back carefully into place. It is now time to re-align and install gears; injection pump with others in reverse order as per instruction on end play adjustment as well as timing.

Drain the cooling system, then remove the radiator, fan, pulleys, belts, and water pump. If the vehicle has air conditioning, unbolt the condenser and position it out of the way; if any hoses need to be disconnected, have the system discharged by a dealer or qualified specialist. Next, remove the grille and the intake manifold, followed by the rocker arm covers, rocker arm and shaft assemblies, pushrods, and valve lifters. Remove the fuel pump and distributor, plugging the fuel lines to prevent drainage. Take out the harmonic balancer, timing chain cover, timing chain, and sprockets, ensuring to align the timing marks on the sprockets before removal to prevent damage to the camshaft journals. Slide the camshaft forward out of the bearing bores, being extremely careful to avoid damaging the bearings and surfaces. Upon re-installation, lubricate the camshaft lobes with heavy oil, and after ensuring the camshaft timing marks are aligned, reinstall all components in reverse order using new gaskets.

Drain the cooling system, then remove the radiator, fan, pulleys, belts, and water pump. If the vehicle has air conditioning, unbolt the condenser and position it out of the way; if any hoses need to be disconnected, have the system discharged by a dealer or qualified specialist. Next, remove the grille, followed by the intake manifold. Take off the rocker arm covers, rocker arm and shaft assemblies, pushrods, and valve lifters. Remove the fuel pump and distributor, plugging the fuel lines to prevent drainage. Then, remove the harmonic balancer, timing chain cover, timing chain, and sprockets, ensuring the timing marks on the sprockets are aligned before removal to avoid damaging the camshaft journals. Slide the camshaft forward out of the bearing bores, being extremely careful to avoid damaging the bearings and bearing surfaces. Upon re-installation, lubricate the camshaft lobes with heavy oil, and after confirming that the camshaft timing marks are aligned, re-install all components in reverse order using new gaskets.

If the engine has been removed from the car, disregard the following steps which do not apply. Since this procedure requires air conditioning disconnection, take the car to a dealer or specialist for A/C de-pressurization. Remove the intake manifold, then take out the push rods from the lifters by removing the rocker covers and loosening the rocker arm nuts. Keep the valve lifters separate for reinstallation in their original positions. Remove the front grille, radiator, shroud, air conditioning condenser, and hood catch support as necessary to provide clearance for the camshaft. For Chevrolet engines, remove the fuel pump and fuel pump push rod. Next, take out the torsional damper, crankcase front cover, and camshaft sprocket/timing chain. Install two bolts into the camshaft bolt holes to use as grips for pulling the camshaft. Carefully draw the camshaft out of the engine block slowly to avoid damaging the camshaft bearings, supporting it with one hand near the engine block. Before installing the camshaft, coat each of the lobes and journals liberally with 'Molykote' or its equivalent, and lubricate the lifters as well. Slide the camshaft into the engine block, taking care not to damage the bearings, and then install the remaining components in the reverse order of removal. Finally, adjust the valve lash.

After bearing replacement, lubricate the camshaft, align the timing marks, and reinstall it, along with the distributor. Reinstall the remaining components in reverse order.

If there is deep scoring, it will necessitate a new camshaft.

Very shallow scratches can be removed with fine emery cloth or an oil stone.

Remove the fuel pump and fuel pump pushrod, then take off the torsional damper, crankcase front cover, and camshaft sprocket/timing chain.

Begin by removing the intake manifold.

After installing new bearings, a new camshaft rear plug should be installed flush 1/32 inch below and parallel to the rear surface of the block.

Carefully remove the valve lifters while keeping them in the proper order for re-installation.