2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 610Get this manual
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GEAR HOUSING
Available Shim Thickness0.10 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.30 mm, 0.40 mm, and 0.50 mmExample: If "T2" is 1.18 mm, then the forward gear shim is 1.15 mmIf "T2" is 1.20 mmthen the