Chevrolet 14031378 Camshaft Asm

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.

Examine the bearing surfaces and the surface of the cam lobes.

Examine the bearing surfaces and cam lobes, removing the oil pan if necessary for thorough inspection.

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.

Before installing the camshaft, ensure that number 1 cylinder is at TDC and coat each of the lobes and journals with lithium-based grease.

Install the camshaft sprocket and timing chain, ensuring that the marks on the crankshaft and camshaft sprockets align.

Shallow surface scratches can be smoothed with fine emery cloth or oilstone, but deep scoring requires a new camshaft.

After that, detach the timing chain and camshaft sprocket.

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.