1. Technical Specifications

2. Key Features & Functionality

• Precision Seal Concentricity: Internal seal receiver bores are CNC micro-machined to ensure true concentric alignment with the lower crankshaft journal, preventing premature seal lip wear and leakage.

• Thermal & Acid Corrosion Resistance: Cast from premium low-copper alloy to withstand direct exposure to hot exhaust blow-by gases and corrosive carbon residues inside the upper casing.

• Dual Static/Dynamic Sealing Barrier: Features a precision outer perimeter O-ring groove and dual-seal press-fit bore, forming an airtight barrier against vacuum air ingress and oil weeping.

• Direct Drop-In OEM Fitment: Flange bolt spacing, locating pilot diameter, and height dimensions strictly match factory drawings for seamless installation during major powerhead overhauls.

3. Compatible Models

Primarily compatible with Yamaha V4 and V6 outboard powerhead platforms:

• Yamaha 2-Stroke V4 Series: 115B, 115C, 130B, 115TLR, 130TLR models

• Yamaha 2-Stroke V6 Series: 150A, 150F, 175D, 200A, 200F, 225D, 150–225 TLR/TXR (2.6L platforms)

• Outboard Clones: Compatible with commercial and recreational outboards built on the Yamaha V4/V6 lower crankcase architecture

4. Aftermarket & Brand Compatibility

• OEM Brand Fitment:

• Yamaha Marine: Designed for genuine Yamaha V4 and V6 powerhead lower crankshaft sealing systems.

• PREMARINE Brand Aftermarket Replacement:

• PREMARINE Quality Standard: PREMARINE specializes in high-durability marine engine castings, seal housings, and powerhead overhaul hardware. This oil seal housing is manufactured using automated vacuum die-casting and precision CNC machining lines.

• Direct OEM-Level Performance: Pilot concentricity, surface finish tolerances, and bolt lug tensile strength meet or exceed OEM specifications, serving as the premier cost-effective solution for preventing lower crankcase air leaks.

5. Common Symptoms & Troubleshooting

• High/Unstable Idle, Lean Sneezing, or Lower Cylinder Misfire (Air Leak):

• Cause: Corroded housing pilot or failed outer O-ring allowing unmetered air to be sucked into the bottom crankcase chamber.

• Troubleshooting: Perform a crankcase pressure/vacuum decay test; if leakage occurs at the base, remove and inspect the seal housing.

• Oil Weeping Down the Driveshaft / Upper Casing Area:

• Cause: Worn lower crankshaft oil seals or pitting corrosion inside the housing seal press bore.

• Troubleshooting: Inspect the inner housing walls for scoring or pitting; replace the housing assembly if the bore no longer holds seals securely.

• Cracked Fastener Lugs or Warped Mounting Flange:

• Cause: Uneven bolt torquing during assembly or heavy powerhead vibration harmonics.

• Troubleshooting: Inspect bolt holes for hairline fractures during powerhead rebuilds; replace any damaged housing immediately.

OEM Part Numbers

Compatible OEM references include:

6H1-15359-01-94

6H1-15359-01

6H1-15359-00

6H1-15359-00-94

Compatible Engine Models

This Oil Seal Housing is primarily designed for:

2-Stroke V4  115B//115C/130B/115TLR/130TLR

2-Stroke V6 150A/150F/175D/200A/200F/225D/150–225 TLR/TXR

If you are unsure about compatibility, please provide your engine model number or identification plate for verification before ordering.

Applications

This Oil Seal Housing is commonly used for:

Outboard engine repair

Engine rebuilding projects

Marine maintenance workshops

Boat fleet maintenance

Commercial fishing vessels

Recreational boats

Marine spare parts distribution