Mercury 9S4Z-6507-A Valve - Inlet

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Thorough cleaning of the cylinder head and valve components, followed by a detailed inspection, will enable you to decide how much valve service work must be carried out during the engine overhaul.

11. Depress the cam follower again and press the correct shim into the recess in the cam follower with the thickness marking facing downwards. Ensure that the shim is properly located and apply a smear of clean oil to it. 12. After setting all clearances for the first cylinder's valves, rotate the crankshaft through two full turns clockwise to settle the shims. Return the cylinder to TDC on the compression stroke and recheck the valve clearances. Repeat the procedure from step 10 if any are still incorrect. 13. Repeat the process for the remaining cylinders, turning the crankshaft to bring each to TDC and then 90° after TDC. 14. Keep a record of the thickness of shim fitted at each position for future adjustments. Shims can be interchanged between cam followers to achieve correct clearances, but do not turn the camshaft with any shims removed to avoid jamming. 15. When all clearances are correct, remove the tool and install the valve cover.

Check that the valve clearances are now correct. If any clearances are still not within specification, carry out the adjustment procedure again.

Each lifter is marked with a thickness number. Only refer to the numbers after the decimal point. A "0.650" marking refers to an actual thickness of 3.650 mm.