Description

The Mercury MerCruiser Quicksilver 91-43559T is a genuine Mercury Marine OEM clamp plate tool used for Bravo sterndrive service where the factory service procedure calls for this specialty tool. This tool is used during lower-unit and gear housing service to help hold the gear assembly in the correct service position while checking or setting internal gearcase measurements. It is intended for professional Bravo drive service, gear housing work, bearing service, and related lower-unit procedures that require the correct Mercury clamp plate.

Key Features

• Genuine Mercury Marine factory OEM service tool.
• Mercury/MerCruiser part number: 91-43559T.
• Manufacturer part number: 43559T.
• Official part label: CLAMP PLATE TOOL.
• GTIN/UPC: 745061467699.
• Listed shipping weight: 0.90 lb.
• Listed shipping dimensions: 3.80 in. L x 1.90 in. W x 3.90 in. H.
• Used for Bravo sterndrive gear housing and lower-unit service procedures where specified by Mercury.

Application Compatibility

This service tool is associated with Mercury/MerCruiser Bravo sterndrive and related transom service applications by serial range, including:

• Bravo One
• Bravo Two
• Bravo Three
• Bravo X One
• Bravo X Two
• Bravo X Three
• Bravo XR One
• Bravo XR Three
• Bravo XR Sportmaster
• Bravo XZ One
• Hi Performance Transom
• Integrated Transom

Use this tool only where the Mercury service manual or parts/service procedure specifically calls for 91-43559T / 43559T.

Fitment Notice

Confirm the required tool by drive model, drive serial number, gear housing type, and the exact Mercury service procedure before ordering. Bravo drive families share many service operations, but specialty tools can vary by housing style, bearing carrier arrangement, gearset, and service step.

When This Tool Is Needed

This clamp plate tool is used during Bravo gear housing service, lower-unit teardown, bearing carrier work, gearset inspection, and procedures where the gear assembly must be held securely for accurate service checks. It is especially relevant when the gear housing is separated for internal inspection, resealing, bearing service, shim work, or gear backlash/preload verification.

Service Notes

Use this tool only with the correct Mercury service manual procedure for the specific Bravo drive. Inspect the gear housing, bearing carrier, gearset, shims, seals, bearings, and related service tools before beginning the job. Do not substitute generic clamps or improvised plates when a factory clamp plate is required, as inaccurate holding or alignment can affect measurement accuracy and gearcase setup.

Alternate/Superseded Part Numbers

• 91-43559T — Mercury/MerCruiser formatted service tool number
• 43559T — Manufacturer part number
• Sierra 18-9843 — aftermarket service tool cross-reference to verify by application

Parts Desk Insight

Bravo gearcase setup depends on accurate measurement and controlled assembly position. Using the correct clamp plate tool helps keep the service procedure repeatable, especially when checking gear contact, bearing preload, backlash, or related internal tolerance work on Bravo sterndrives.

Shipping: Ships same or next day for fast Canada wide shipping.