To inspect camshaft lobe lift and measure wear, it is required to have the
Rocker Arms out of the way while the pushrods remain in. Turn the engine until the number one piston is at top dead centre of the compression stroke: install a dial indicator on the cylinder head with its plunger touching the first rocker arm. Aim the needle of the dial indicator at the lowest point of the cam lobe and zero it and slowly turn the crankshaft until the needle deflects in the opposite direction, this gives the maximum cam lobe lift. Note this measurement and move the piston to TDC then follow the same process on the other valves while making sure that every piston is at TDC. After making the above checks, another check can be made to compare it with the specified value; if the lobe lift is below the specified value then cam lobe wear has taken place and this is a sign that you are going to need a new camshaft. For removal, pull out the pushrods and their lifters,
Timing Chain and the sprocket from the camshaft; measure the end play with a dial indicator. In case the play is beyond the measures allowed by the specifications, it is advisable to fit a new thrust plate when installing the new assembly. Withdraw the camshaft slowly, gently to prevent bending the bearings that are sometimes so small that they can hardly be seen. You should check the camshaft for wear, pitting or any form of damage once it has been removed; if the journals are badly worn, both the camshaft and bearings will have to be taken out and this will call for the services of an expert. Check the bearing journals for signs of wear by using a micrometer and examine the lobes for any sign of discoloration or damage, if the camshaft has not been badly abused, it may be reused. The procedure for the balance shaft is similar to the one described above; the thrust plate bolts should be loosened, and the shaft should be guided out; still, it is necessary to remember that any signs of wearing of the bearings might only be seen by a machine shop. The journals ought to be lubricated any time installation is being performed again and the keyway should sit right as it should with the gear. It is also recommended that the camshaft bearing journals and lobes should be lubricated before placing the camshaft into the engine; also aligning the balance shaft gear. Coat the thrust plate with grease and while doing this place it in its proper position, To put it in the right place for reassembly the process is done in the reverse to that of the removal process. Last but not the least; replace the oil as well as oil filter before turning on the engine.