2003 Johnson ST 55 HP WRL 2 Stroke Commercial Service Manual, PN 5005483, Page 37Get this manual
INSTALLATION AND PREDELIVERY PREINSTALLATION CONSIDERATIONS
Mounting Surface
Transom Surface Inspection
Inspect transom surface prior to drilling mounting holes in boat's transom The width of the top edge of the transom should provide adequate clearance The transom must be flat and cannot have any protrusions The transom should conform to ABYC Standards The boat's transom angle should be approximately 14 Identify issues related to transom strength, transom height, splash-well clearance, and cable or hose routing Identify specific steering system requirementsRefer to the specifications for all steering systems and the manufacturer's steering system installation instructions
Jack plate assemblies must provide one-piece mounting surface to adequately support the outboard, hydraulic unit, and steering system components
One-piece Mounting Surface
Mounting Hardware
WARNING
WARNING