Sierra 18-7902 4-Cycle Outboard Oil Filter – Yamaha F15–F100 4-Stroke

Sierra 18-7902 4-Cycle Outboard Oil Filter – Yamaha F15–F100 4-Stroke

Part Number: 18-7902  |  SKU: 47-7902  |  UPC: 808282244873

The Sierra 18-7902 is a spin-on oil filter for selected Yamaha 4-stroke outboard engines, covering a broad range of F-series and T-series applications from the mid-1990s through the early 2000s. It uses a 20 mm x 1.5 thread, heavy-wall steel canister with epoxy corrosion protection, high-efficiency filter media, and an anti-drain-back valve that helps retain oil in the filter during shutdown and reduce dry-start conditions on startup.

Key Specifications

• Thread: 20 mm x 1.5
• Filter type: 4-cycle outboard spin-on oil filter
• Anti-drain-back valve: Yes
• Canister: Heavy-wall epoxy-coated steel
• Filter media: High-efficiency, meets or exceeds OEM specification
• Marine-duty construction for freshwater and saltwater environments

Compatible Applications

• Yamaha F15 4-stroke outboards (selected model years — verify by serial number)
• Yamaha F25 4-stroke outboards (selected model years — verify by serial number)
• Yamaha F40 4-stroke outboards (selected model years — verify by serial number)
• Yamaha F50 4-stroke outboards (selected model years — verify by serial number)
• Yamaha T50 4-stroke outboards (selected model years — verify by serial number)
• Yamaha F80 4-stroke outboards (selected model years — verify by serial number)
• Yamaha F100 4-stroke outboards (selected model years — verify by serial number)
• Other Yamaha 4-stroke outboards specifying a 3FV-13440-series or JE8-13440-series filter number

Fitment Note: Coverage spans primarily mid-1990s through early-2000s production, depending on model and horsepower. Always confirm your Yamaha model, model year, and existing OEM filter number before ordering. The 20 mm x 1.5 thread and 3FV-13440-series cross-reference are the most reliable fitment identifiers.

Service Interval

Replace at every scheduled engine oil service. Follow Yamaha’s recommended service interval for your specific outboard model — typically every 100 hours or once per season, whichever comes first. Refer to your Yamaha owner’s or service manual for guidance.

Installation Notes

• Remove the old filter and confirm the old gasket has come away with it — a retained gasket will cause an oil leak
• Clean the filter mounting surface
• Lightly coat the new filter gasket with fresh engine oil before threading it on
• Tighten by hand plus ¾ turn, or per Yamaha service specification — do not over-tighten
• Run the engine and inspect for leaks before returning to service

OEM & Cross-Reference Part Numbers

• Sierra: 18-7902
• Yamaha: 3FV-13440-00-00, 3FV-13440-10-00, 3FV-13440-20-00, 3FV-13440-30-00, JE8-13440-00-00
• Quicksilver / Mercury: 8M0154774
• Mallory: 9-57809
• Fram: PH6017A
• Wix: 51358

Related Products

• Seachoice 50-21018 Full-Flow Oil Filter – 20 Micron — value alternative for Yamaha 3FV/3FC-series 4-stroke outboards
• Sierra 18-7901 4-Cycle Outboard Oil Filter – Mercury/Mariner & Yamaha 8–9.9 HP — Sierra filter for smaller Yamaha and Mercury 4-stroke outboards
• Sierra 7914 4-Cycle Outboard Oil Filter — Sierra filter for Mercury 4-stroke outboards
• Seachoice 50-21004 Full-Flow Oil Filter – 20 Micron — Mercury & Mariner 4-stroke outboard filter

Parts Desk Insights

Best Use Case: Routine oil and filter changes on a wide range of Yamaha F-series and T-series 4-stroke outboards in the 15–100 HP range, covering mid-1990s through early-2000s production. The 3FV-13440 series is one of Yamaha’s most widely used oil filter references across this era, making the 18-7902 a high-frequency service item for shops carrying Yamaha parts and for customers maintaining older Yamaha 4-stroke outboards.

Common Issues: Yamaha uses multiple 20 mm x 1.5 oil filter references across their 4-stroke outboard lineup, and some look similar to this one. The safest fitment confirmation is matching one of the Yamaha 3FV-13440-series or JE8-13440-00-00 numbers against the filter currently on the engine. As with all spin-on filters, remind customers to verify the old gasket comes off with the old filter before installing the new one.