840306T10GEAR HOUSING ASSEMBLY Complete, With Torque Tab

Mercury outboard spare part 840306T10 (GEAR HOUSING ASSEMBLY Complete, With Torque Tab). Supplied by Dimo Marine for wholesale and export — genuine and quality aftermarket options available.

Fits 250 HP XS 6 CYL (3.0L), 300 HP XS 6 CYL (3.2L), 2.5XS (2.5L). Select a model tag above to open the exploded diagram and confirm the position.

Part Specifications and Installation Reference

Mercury outboard part 840306T10 (GEAR HOUSING ASSEMBLY Complete, With Torque Tab), documented in 5 exploded diagram location(s), across the 2-STROKE-DFI-OPTIMAX series.

SeriesModelSerial rangeREFQtyDiagram
Mercury 2-STROKE-DFI-OPTIMAX2-5xs-2-5l0T997974 THRU 1E000796-1View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l0T997974 THRU 1E000796-1View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l1E000797 THRU 1E002341-1View
Mercury 2-STROKE-DFI-OPTIMAX300-hp-xs-6-cyl-3-2l1E001867 THRU 1E052057-1View
Mercury 2-STROKE-DFI-OPTIMAX300-hp-xs-6-cyl-3-2l1E052058 THRU 1E053987-1View

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Appears in diagrams of these models

  • 250 HP XS 6 CYL (3.0L)
  • 300 HP XS 6 CYL (3.2L)
  • 2.5XS (2.5L)