Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 158Get this manual
CYLINDER BLOCK AND CRANKCASE
Measuring Camshaft Lobe Height "A" IntakeExhaust
NOTE: 2000 model year outboards have hp mark located on cam gear as shown belowFor 2001 model year, all will have hp camshaftStandard Value hp0.993 in(25.24 mm) hp1.047 in(26.59 mm) hp1.115 in(28.33 mm) Out of the Limit 0.983 in(24.96 mm) or less requires replacement 1.037 in(26.33 mm) or less requires replacement 1.105 in(28.06 mm) or less requires replacement
Measuring Camshaft Bearing Diameter "B"
Standard Value 0.550 in(13.98 mm) CAM ID (19992000) (19992000) (2000) 456 (2001) 6