Mercury E9SZ-6250-B Camshaft

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To check camshaft lobe lift and see how much its wear, unbolt the valve covers and the rocker arms and leave the push rods installed. Remove the number one piston and place it at Top Dead Centre on the compression stroke, then install a dial gauge on the engine so that it is facing the first push rod. Depress the dial indicator and start rotating the crankshaft slowly counterclockwise and stop at the point where the needle stops showing more readings and then starts to decrease noting the maximum cam lobe lift. Take this measurement and move the piston to TDC and do this for all the valves in the same firing order with the piston on the compression stroke. Finally, after performing the checks, refer to the corresponding specifications; if the measure of the lobe lift is under the required value, then it means wear and as a result a new camshaft will be needed. For removal, get off the pushrods, valve lifters, timing chain, as well as the camshaft sprocket; one must consider if the radiator or air conditioning condenser needs to come off. Take out the bolts of the camshaft thrust plate and check the thrust plate for signs of wear, if it is worn you replace it. Using the cam sprocket bolt turn it partially to act as a handle and slowly push the camshaft out without scratching the lobes against the bearings. After removal, camshaft should be cleaned and checked for damage and wear on bearing journals; if they are damaged, both camshaft and bearing will have to be replaced and it can only be done using special tools and equipment. Check the camshaft lobes for damage or discoloration, if they are still okay, the bearing journals should be used to measure for excessive wearing and thus the camshaft can be again used. The camshaft should be lubricated with grease or assembly lube before it was installed, and inserted into the engine with the help of a follower to prevent any bearing damage. Make sure that the Woodruff key is correctly positioned before it is fitted; grease the thrust plate and when it is fitted, ensure that the grooves are facing inwards. Put in the timing chain and sprockets then using clean oil lubricate the lifters before reinstalling them. The final part of the fixing process is based on step-by-step reversing of the exclusion acts, and before the engine turn on, replace the oil and oil filter.

To check camshaft lobe lift and see how much its wear, unbolt the valve covers and the rocker arms and leave the push rods installed. Remove the number one piston and place it at Top Dead Centre on the compression stroke, then install a dial gauge on the engine so that it is facing the first push rod. Depress the dial indicator and start rotating the crankshaft slowly counterclockwise and stop at the point where the needle stops showing more readings and then starts to decrease noting the maximum cam lobe lift. Take this measurement and move the piston to TDC and do this for all the valves in the same firing order with the piston on the compression stroke. Finally, after performing the checks, refer to the corresponding specifications; if the measure of the lobe lift is under the required value, then it means wear and as a result a new camshaft will be needed. For removal, get off the pushrods, valve lifters, timing chain, as well as the camshaft sprocket; one must consider if the radiator or air conditioning condenser needs to come off. Take out the bolts of the camshaft thrust plate and check the thrust plate for signs of wear, if it is worn you replace it. Using the cam sprocket bolt turn it partially to act as a handle and slowly push the camshaft out without scratching the lobes against the bearings. After removal, camshaft should be cleaned and checked for damage and wear on bearing journals; if they are damaged, both camshaft and bearing will have to be replaced and it can only be done using special tools and equipment. Check the camshaft lobes for damage or discoloration, if they are still okay, the bearing journals should be used to measure for excessive wearing and thus the camshaft can be again used. The camshaft should be lubricated with grease or assembly lube before it was installed, and inserted into the engine with the help of a follower to prevent any bearing damage. Make sure that the Woodruff key is correctly positioned before it is fitted; grease the thrust plate and when it is fitted, ensure that the grooves are facing inwards. Put in the timing chain and sprockets then using clean oil lubricate the lifters before reinstalling them. The final part of the fixing process is based on step-by-step reversing of the exclusion acts, and before the engine turn on, replace the oil and oil filter.

These engines are difficult to work on and require special tools for many procedures. Any procedure involving timing chain, camshaft, or cylinder head removal must be read carefully, and disassembly must proceed using the special tools; otherwise, damage to the engine could result.

The camshafts are removed from the cylinder head after the primary timing chain and VCT units have been taken out.

The initial steps include removing the valve covers and rocker arms while leaving the pushrods in place, and positioning the number one piston at TDC on the compression stroke.