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Guide Plates & Gaskets (Tohatsu)

Water Pump Guide Plate Gasket 3B7-65029-0

Brand: Tohatsu

SKU: 3B7-65029-0

$3.85
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The Genuine Tohatsu 3B7-65029-0 Water Pump Guide Plate Gasket is a replacement sealing component for selected Tohatsu 2-stroke and TLDI outboard motors. Installed beneath the water pump guide plate, it helps maintain a secure seal within the cooling-water pump assembly. Ideal for water pump servicing, impeller replacement and lower-unit repairs, this gasket helps prevent internal leakage and supports reliable cooling-water circulation through the engine.

Key benefits

Key Benefits

  • - Genuine Tohatsu OEM replacement gasket.
  • - Helps maintain a watertight seal beneath the water pump guide plate.
  • - Suitable for selected conventional 2-stroke and TLDI outboards.
  • - Designed for the corresponding factory water pump assembly.
  • - Ideal for impeller replacement and water pump rebuilding.
  • - Helps reduce the risk of internal water leakage.
  • - Replaces damaged, compressed or deteriorated original gaskets.

Specifications & Dimensions

  • - Manufacturer: Tohatsu
  • - OEM Part Number: 3B7-65029-0
  • - OEM Ordering Number: 3B7650290M
  • - Product Type: Water Pump Guide Plate Gasket
  • - Installation Location: Lower unit / water pump guide plate
  • - Function: Seals the water pump guide plate mating surface

Compatible Tohatsu Outboards

  • Conventional 2-Stroke Models
  • - M60B – 60HP, documented water pump configuration.
  • - M70B – 70HP, documented water pump configuration.
  • - M70C – 70HP, including 2003 parts catalogue applications.
  • - M90A – 90HP, including 1996 parts catalogue applications.
  • - M90A2 – 90HP, confirmed in the 2015 factory parts catalogue.
  • TLDI Direct-Injection Models
  • - MD40B2 – 40HP, selected Big Foot gearcase configurations.
  • - MD50B2 – 50HP, selected Big Foot gearcase configurations.

Cross-Reference & Replacement Part Numbers

  • Tohatsu OEM
  • - 3B7-65029-0 – Original OEM part number.
  • - 3B7650290M – Genuine OEM ordering number.

Signs the Water Pump Guide Plate Gasket Needs Replacing

  • - Water Leakage: Evidence of leakage around the water pump guide plate.
  • - Damaged Gasket: Visible tears, cracks or missing sections.
  • - Compressed Gasket: Gasket has flattened or lost its ability to seal.
  • - Deterioration: Material has hardened, softened or begun breaking apart.
  • - Corrosion Damage: Corrosion around the sealing surface has affected gasket integrity.
  • - Reduced Cooling Performance: Internal leakage may contribute to reduced pump efficiency.
  • - Water Pump Servicing: Existing gasket is damaged or cannot be removed intact during disassembly.
  • - Lower Unit Repairs: Gasket requires replacement when the guide plate is removed.

Important Fitment Information

  • - Confirm the outboard model, serial number and water pump configuration.
  • - This gasket is not suitable for every 40HP–90HP outboard.
  • - MD40B2 and MD50B2 applications are limited to the specified Big Foot gearcase configurations.
  • - Compare the original gasket profile, mounting holes and water passage openings.
  • - Inspect the guide plate for corrosion, scoring and distortion before installation.
  • - Thoroughly clean mating surfaces without damaging the metal.
  • - Do not reuse a torn or deteriorated gasket.
  • - Use sealants only where specified by the manufacturer's service manual.
  • - This product is the guide plate gasket only, not a complete water pump repair kit.

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