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Gaskets (Tohatsu)

Engine Basement Gasket 3M3-01303-0

Brand: Tohatsu

SKU: 3M3-01303-0

$47.60
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The Genuine Tohatsu 3M3-01303-0 Engine Base Gasket is designed for selected 9.9HP, 15HP and 18HP 2-stroke outboard motors. Installed between the engine powerhead and its mounting base, it helps seal the mating surfaces and prevent exhaust or cooling-water leakage. Ideal for powerhead removal, engine rebuilding and gasket replacement, this genuine component helps restore correct sealing and supports reliable outboard operation following servicing.

Key benefits

Key Benefits

  • - Genuine Tohatsu replacement engine base gasket.
  • - Designed for selected 9.9HP, 15HP and 18HP 2-stroke outboards.
  • - Helps seal the powerhead-to-engine-base joint.
  • - Helps prevent leakage at the engine mounting interface.
  • - Suitable for powerhead removal and reinstallation.
  • - Replaces earlier engine base gasket part numbers.
  • - Ideal for engine repairs and preventative maintenance.

Specifications & Dimensions

  • - Manufacturer: Tohatsu
  • - OEM Part Number: 3M3-01303-0
  • - Current Ordering Number: 3M3013030M
  • - OEM Description: Engine Basement Gasket
  • - Product Type: Engine Base / Powerhead Mounting Gasket
  • - Installation Location: Between the powerhead and engine mounting base
  • - Engine Type: 2-stroke

Compatible Tohatsu Outboards

  • 2-Stroke – Factory-Confirmed Models
  • - M9.9D2 – 9.9HP
  • - M15D2 – 15HP
  • - M18E2 – 18HP
  • - MX18E2 – 18HP
  • - M9.9B2 – 9.9HP
  • - M15B2 – 15HP
  • - M18C2 – 18HP

Cross-Reference & Superseded Part Numbers

  • Tohatsu OEM
  • - 3M3-01303-0 – Current engine base gasket.
  • - 3M3013030M – Current OEM ordering number.
  • - 350-01303-1 / 350013031M – Superseded engine base gasket.
  • - 350-01303-0 / 350013030M – Earlier superseded engine base gasket.

Signs the Engine Base Gasket Needs Replacing

  • - Water Leakage: Cooling water escapes around the powerhead mounting joint.
  • - Exhaust Leakage: Exhaust gases leak from the engine base area.
  • - Visible Gasket Damage: Gasket is torn, cracked, compressed or deteriorated.
  • - Corrosion Around the Joint: Salt deposits or corrosion develop around the mating surfaces.
  • - Damaged Sealing Surface: Existing gasket no longer provides an effective seal.
  • - Powerhead Removal: Gasket has been disturbed or damaged during engine disassembly.
  • - Engine Rebuilding: Replacement is required when reassembling the powerhead mounting joint.
  • - Previous Overheating: Excessive heat may have damaged the gasket or adjacent components.
  • These symptoms may also result from other engine faults, so inspect the surrounding components before replacement.

Important Fitment Information

  • - Confirm the exact outboard model and serial number before ordering.
  • - This gasket is designed for selected 9.9HP, 15HP and 18HP 2-stroke engines.
  • - It is not a universal gasket for all engines within these horsepower ranges.
  • - Match the original gasket profile, mounting holes and water passages.
  • - Inspect the powerhead and engine base mating surfaces for corrosion or damage.
  • - Remove old gasket material carefully without damaging the sealing surfaces.
  • - Follow the manufacturer's service manual for gasket installation and mounting bolt tightening sequence.
  • - Do not reuse a damaged or compressed gasket.
  • - This product is an individual gasket, not a complete powerhead gasket kit.

Shipping

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