Mercury 9E5Z-6505-A Valve - Exhaust

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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.

Check the valve clearances with a feeler gauge of the specified thickness. If the clearance is correct, you should feel a slight drag as the feeler gauge is slid between the lifter and the camshaft.

The valve clearances are checked the same way as on the 2.0L engine, but instead of removable shims, cam followers with heads of differing thicknesses are used to set the desired clearance. The same formula used to calculate shim thickness is used to calculate desired follower head thickness. To change the cam followers, the camshafts have to be removed.