For Mercury/ Mariner 26-8173971 Oil Seal 26-817397 Outboard 30-60hp 2-3cyl x2PCS
26-817397-1 Upper Seal

For Mercury/ Mariner 26-8173971 Oil Seal 26-817397 Outboard 30-60hp 2-3cyl x2PCS

 

🧰 What it is

  • It’s the upper crankshaft oil seal for Mercury / Mariner outboard / stern drive engines (“Seal, Upper”). 

  • Mercury‑Marine identifier: part number 26‑817397‑1 (sometimes written without the hyphen or with the trailing digit “1”: 26‑8173971). 


🔧 What equipment/models it fits

  • The seal is used on Mercury / Mariner 60 hp Bigfoot motor(s) as one listing shows.

  • The “upper seal” suggests its position is at or toward the top of the engine’s crankcase / housing — often sealing around the crankshaft as it exits the upper housing. That helps keep oil in where it belongs, preventing leaks.

  • The part is labeled as the Upper Crankshaft Oil Seal (aka “Seal, Upper”). 

  • Another listing (WSM) implies it is used in Mercury 2‑3 cylinder engines in years 1994‑2014 in at least one application (“WSM Mercury Upper Crank Seal 2‑3 Cyl. '94‑'14 550‑32, 26‑817397‑1”).

⚙️ Cross‑References & Specification Details

  • NSN (National Stock Number) for it is 5330‑01‑518‑5579 (which corresponds to 26‑817397‑1).

  • The brand “Quicksilver” (Mercury’s OEM brand spare) also lists this seal under part number 26‑8173971.

  • It is an OEM genuine Mercury/Mariner part.

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