2001 Mercury Mariner 50-60HP Factory Service Manual, Page 224Get this manual
CYLINDER HEAD
3Measure the cam lobe length (a) and width (b)Cam Lobe Specifications Intake Exhaust 1.2141.222 in(30.8331.03 mm) 1.2141.222 in(30.8331.03 mm) 1.0201.028 in(25.90 -26.10 mm) 1.0201.028 in(25.90 -26.10 mm)
Intake Exhaust
4Measure the camshaft bore diameters (a) and camshaft bearing diameters (b)