Mercury MerCruiser 865317T02 2-Bib Hose Fitting Assembly – Cool Fuel / Raw-Water Cooling

Mercury MerCruiser 865317T02 – 2-Bib Orifice-Meter Hose Fitting Assembly

Part Number: 865317T02 / 22-865317T02
Brand: Mercury / MerCruiser
Type: 2-bib orifice-meter hose fitting assembly
Kit Contents: Hose fitting assembly + 4 hose clamps
System: Raw-water cooling / Gen III Cool Fuel Module

Overview

The Mercury MerCruiser 865317T02 is a genuine 2-bib orifice-meter hose fitting assembly used in selected MerCruiser raw-water cooling and Gen III Cool Fuel system configurations. Mercury service documentation identifies this as the two-bib hose kit used when servicing certain earlier Cool Fuel Module installations with the updated Gen III module design. The assembly ships complete with four hose clamps for a ready-to-install service.

Key Features

• Genuine Mercury / MerCruiser OEM 2-bib orifice-meter hose fitting assembly
• Designed for raw-water cooling and Gen III Cool Fuel system applications
• Includes 4 hose clamps — complete kit for a full service installation
• OEM construction ensures correct bib configuration, port sizing, and sealing
• Referenced as Mercury part 22-865317T02 in service documentation

Compatible Applications

• MerCruiser 496 MAG and 496 MAG H.O. engines equipped with the applicable 2-bib raw-water cooling or Cool Fuel system configuration
• Other MerCruiser engine families using the 2-bib orifice-meter hose arrangement — verify via engine serial number and parts diagram
• Serial number fitment notice: Mercury used both 2-bib and 3-bib hose arrangements depending on engine serial range and Cool Fuel system generation. Always confirm your existing hose configuration (2-bib or 3-bib) and engine serial number before ordering. The 3-bib version is 865208T02.

System & Diagram Position

This assembly is positioned in the raw-water cooling circuit and/or Cool Fuel Module hose routing, specifically at the orifice-meter bib connections. It is the 2-bib version of the hose kit; consult the applicable MerCruiser cooling-system or Cool Fuel diagram for your engine serial range to confirm the correct assembly for your installation.

Kit Contents

• 1x 2-bib orifice-meter hose fitting assembly
• 4x hose clamps

When to Replace

Replace this assembly when the hose or fittings are cracked, leaking, hardened, or damaged, or when performing a Cool Fuel Module service conversion that requires an updated hose configuration. Any raw-water or coolant leakage around the bib fittings or hose connections should be addressed promptly to prevent engine overheating or fuel system issues.

Installation Notes

• Shut off the fuel supply and allow the engine to cool before beginning service
• Note the original 2-bib hose routing and clamp positions before disassembly — photograph if helpful
• Inspect all mating fittings and connected hoses while the assembly is removed
• Install the supplied hose clamps and tighten to the specification in the MerCruiser service manual
• Run the engine and verify the system is fully leak-free at all bib connection points before returning the vessel to service

Technical FAQ

What is the difference between 865317T02 and 865208T02?
865317T02 is the 2-bib orifice-meter hose assembly. 865208T02 is the 3-bib version. The correct part depends on your engine’s serial range and existing hose configuration. Confirm in the MerCruiser parts diagram before ordering.

Does this kit include clamps?
Yes — four hose clamps are included with the assembly.

Which engines use this assembly?
Confirmed catalog applications include 496 MAG and 496 MAG H.O. engines with the 2-bib Cool Fuel or raw-water cooling arrangement. Check the MerCruiser parts catalog using your engine serial number for full fitment confirmation.

Cross-Reference / Alternate Part Numbers

• Mercury / MerCruiser: 865317T02
• Mercury catalog reference: 22-865317T02
• Related 3-bib kit: 865208T02

Dimensions & Weight

• Weight: approx. 300 g (0.66 lb) — best estimate; update if exact spec is available
• Refer to the MerCruiser service diagram for hose routing dimensions and bib port sizing

Parts Desk Insights

Best Use Case: This assembly is the right part for a Cool Fuel Module service or raw-water cooling hose replacement on a MerCruiser 496 MAG or H.O. engine when the existing installation uses a 2-bib orifice-meter hose arrangement. It’s particularly relevant when converting an earlier Cool Fuel Module to the Gen III design, where the hose kit is a required part of the service procedure.

Common Issues: The most critical step is confirming 2-bib versus 3-bib before ordering — both assemblies look similar and are used on the same engine family depending on serial range. The 3-bib version (865208T02) is not in this catalog listing. Always cross-reference the engine serial number against the applicable MerCruiser Cool Fuel or cooling-system diagram to confirm which assembly is installed on your engine.

Related Products

• Mercury MerCruiser Fuel Module Kit 8M0047215 — fuel module service kit for MerCruiser engines
• Mercury MerCruiser Thermostat 160°F – 8M0076464 – 496 MAG / 8.1L Big Block — thermostat for 496 MAG cooling system service
• Sierra Marine Thermostat 18-43017 – 496 MAG Cooling System — Sierra cross-reference thermostat for 496 MAG
• Mercury MerCruiser Seawater Pump Impeller Kit – 8M0137219 — service the raw-water pump at the same time
• Mercury 8M0082322 – 90° Air Fitting – MerCruiser Seawater Pump & Drain Assembly — related cooling system drain fitting
• Mercury MerCruiser 864579 Cooling System Hose – Check Valve to Thermostat Housing — companion cooling hose
• Mercury Quicksilver Extended Life Coolant/Antifreeze 877770K1 — top up coolant after cooling system service