Oldsmobile 14024278 Camshaft Asm

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Check the bearing surfaces and the surface of the cam lobes; light pitting or scratching may be smoothed with fine emery cloth or an oil stone, but if the camshaft is deeply scored a new one will be necessary. Camshafts should be mounted on V-blocks and employed with a dial gauge to measure camshaft lobes lift and run-out and exclude camshafts that do not meet the stipulated camshaft lobe lift and run-out. Use a micrometer to measure the journal diameters; it is mandatory to scrap any camshaft which does not conform to the above limits. In the case where either camshaft bearings are worn out or in some conditions damaged, then they have to be replaced; it can be done by having to detach the crankshaft but maintaining cylinder heads and pistons. To avoid getting damaged, the connecting rod bolts should be taped before the removal of the crankshaft and the connecting rods should also be taped to the side of the engine to minimize on interference when removing the bearings. Take out the camshaft rear cover from the top of the cylinder block. Bearing can be removed using GM tool part number J-6098 or a like bearing remover / installer tool according to the instructions. The same set of tools is used to set the camshaft bearings where, for instance, the front and the rear bearings help in centering the remainder of the bearings so that the oil hole in the bearings will match the oil hole in the block. Remove any debris, oil or old gasket material from the camshaft rear cover, then give the cover a layer of RTV or any other equivalent sealant with 1/8 in x 3mm diameter around the sealing surface before fixing the cover on the engine block. Finally, reinstall the crankshaft.

The first step is to remove the engine from the car, followed by the rocker arm covers, pushrods, and valve lifters.

Start with the front and rear bearings to guide the centering of the remaining bearings, ensuring that the oil holes in the bearings align with the oil holes in the block.

Support the camshaft with fingers inserted through the fuel pump hole to prevent damage while carefully pulling it straight out from the block.

Carefully extract the camshaft, replace the camshaft bearings as a set, and lubricate the camshaft and bearings before reinstallation. Align the timing marks and reinstall the distributor.

Disconnect the cable from the negative battery terminal, drain the oil from the crankcase, and drain the coolant from the radiator.

Install two bolts into the camshaft bolt holes to use as grips for pulling the camshaft out of the engine block, ensuring to do this 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.

For Chevrolet engines, remove the fuel pump and fuel pump push rod.

Remove the engine and install it on a suitable stand, then take off the rocker arm cover.

Next, take off the crankshaft front cover, fuel pump, and fuel pump pushrod, then remove the distributor.

It will be necessary to drive out the camshaft rear plug from the back.

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

Measure the journal diameters with a micrometer.

If the measurements are not within 0.002-inch of the specified lobe lift, a new camshaft should be installed.

Remove the timing chain and sprocket.

Measure the journal diameter with a micrometer, rejecting any camshaft that fails to meet the limits.

Carefully remove the camshaft thrust plate screws and the camshaft and gear assembly, supporting it to prevent bearing damage.