Ford 1S7Z-6507-AA Inlet Valve

For the 2.0L engine, start by unscrewing of the valve cover while positioning the number 1 cylinder on TDC on the compression stroke while the intake and exhaust cam lobes are facing upwards. The thickness of shims that fits tightly should be noted by measuring the clearance between the cam lobe base and the shim using feeler gauge for each valve. Turn the crankshaft again by 180 degrees clockwise to take the clearances for the cylinder No. 3, and also for the cylinder No. 4 and No. 2. If they are clearances are beyond the set range, some changes will be required. Because of the restricted installation space of the camshafts and cylinder head special tools are used for adjustments. To change a shim, you need to lower the piston from TDC by merely turning the crankshaft roughly 90 degrees clockwise in order to prevent the bending of the valve. Refer to the manufacturer service tool to proceed and lower the cam follower while taking off the shim and measuring its thickness. In the vicinity of small clearance, use a thinner shim; at large clearance, use a thicker shim. Once you have adjusted the clearances on the first cylinder, turn the crankshaft two full turns in order to set all installed shims, bring the crankshaft back to TDC and check all the clearances once again adjusting them if necessary. As for the 2.3L/2.5L engines, the procedure to check the valve clearances is quite the same as with the 2.0L, but due to the use of hydraulic tappets and cam followers with heads of various thickness to obtain the required clearance, the camshafts have to be removed to change followers.

The engine must only be turned using the normal rotation with an anticlockwise motion begun with the right-hand side of the automobile. Start with the removal of the camshaft cover; then set the engine for TDC on cylinder No 1 which means the inlet and exhaust cam lobes of No 1 cylinder will point upwards so as to enable the checking of the valve clearance. Using feeler blades, gauge the valve lash for the base of the cam lobe to the bucket tappet and document the thickness needed for firm sliding-interference on all of the valves of No 1 cylinder Intake and exhaust clearances differ. Then rotate the crankshaft through 180 degrees clockwise and check and record the four valve clearances for No 3, No 4 and, if necessary, No 2 cylinder. If adjustments are required, the bucket lappets may be altered with the camshafts removed. For small clearances fitting is done using a thin bucket tappet while for large clearances a thick one is fitted using the engraved number on the tappet or a micrometer if the number has worn out. Determine the thickness of the new bucket tappet with the help of the desired and actual clearances, the obtained tappet thickness. The correct thickness should then be obtained and new bucket tappets placed in the cylinder head with replacement of the camshafts. Check that the above clearance has taken its right position, if any of the valve clearances is still out, perform the above steps all over again. A record of the thickness of buckets fitted at each position will help in future modifications, by knowing the clearances and the existing thickness of the bucket that is required, the needed thickness of the bucket can be bought in advance. Last, change the camshaft cover upon confirmation with all its clearances.

For the 2.0L engine, start by unscrewing of the valve cover while positioning the number 1 cylinder on TDC on the compression stroke while the intake and exhaust cam lobes are facing upwards. The thickness of shims that fits tightly should be noted by measuring the clearance between the cam lobe base and the shim using feeler gauge for each valve. Turn the crankshaft again by 180 degrees clockwise to take the clearances for the cylinder No. 3, and also for the cylinder No. 4 and No. 2. If they are clearances are beyond the set range, some changes will be required. Because of the restricted installation space of the camshafts and cylinder head special tools are used for adjustments. To change a shim, you need to lower the piston from TDC by merely turning the crankshaft roughly 90 degrees clockwise in order to prevent the bending of the valve. Refer to the manufacturer service tool to proceed and lower the cam follower while taking off the shim and measuring its thickness. In the vicinity of small clearance, use a thinner shim; at large clearance, use a thicker shim. Once you have adjusted the clearances on the first cylinder, turn the crankshaft two full turns in order to set all installed shims, bring the crankshaft back to TDC and check all the clearances once again adjusting them if necessary. As for the 2.3L/2.5L engines, the procedure to check the valve clearances is quite the same as with the 2.0L, but due to the use of hydraulic tappets and cam followers with heads of various thickness to obtain the required clearance, the camshafts have to be removed to change followers.

The remainder of installation is the reverse of removal. Run the engine and check for oil leaks.

A home mechanic can remove and disassemble the heads, perform the initial cleaning and inspection, and then reassemble the heads to deliver them to a dealer service department or an automotive machine shop for the actual service work. This inspection allows the mechanic to assess the condition of the head and valve train components and determine what work and new parts are required.