09-1027B Johnson Pump F5B Spline-Drive Impeller | Genuine OEM Marine Part

🔧 Product Description

Aftermarket F5B Spline-Drive Cooling-Water Impeller - Replaces SPX Johnson 09-1027B / 09-1027B-1

Twelve-blade spline-drive impeller for Johnson F5B cooling-water pumps. The standard MC97 version is widely cross-referenced through Jabsco, Caterpillar, Detroit Diesel, Onan, Perkins, Volvo Penta, Westerbeke, Yanmar and other marine-engine catalogues.

⚙️ Key Features

• Material: MC97/neoprene-type cooling-water compound
• Outside diameter: 57.1 mm / 2.25 in
• Width: 31.5 mm / 1.24 in
• Drive: internal spline
• Blade count: 12
• F5B standard-width configuration

🚤 Compatibility

Commonly used on

• SPX Johnson F5B and F5B-8 spline-drive pumps
• Jabsco pumps specifying 1210-0001
• Engine-cooling pumps carrying one of the listed Caterpillar, Detroit Diesel, Onan, Perkins, Volvo Penta, Westerbeke or Yanmar references

Application Details

• Pump / Service Type: Raw-water engine cooling and general water transfer
• Identification: Confirm 57.1 × 31.5 mm dimensions and the F5B internal spline.
• Always compare the removed impeller or pump against the listed dimensions, drive style, material and housing depth before installation.

🔌 Function

The flexible vanes form expanding chambers on the inlet side and contracting chambers on the discharge side. This produces self-priming suction and moves cooling water or other compatible fluids through the pump.

⚠️ Common Signs of Failure

• Reduced flow or inability to prime
• Engine overheating or weak cooling-water discharge
• Pulsing flow, cavitation or unusual pump noise
• Vanes are cracked, hardened, flattened or missing
• Hub has slipped, corroded or loosened from the rubber body
• Impeller has been damaged by dry running, debris or incompatible fluid

🔄 Supersession & Cross Reference

OEM / Manufacturer Number Progression

• 09-1027B-1 / 09-1027BT-1 - current SPX Johnson water-service designations
• 09-1027B - shortened/legacy designation

OEM / Related Numbers

• 09-1027B
• 09-1027B-1
• 09-1027BT-1
• 09-1027B-9 - nitrile version

Direct Same-Material / Configuration Equivalents

• Jabsco: 1210-0001 / 1210-0001-P
• JMP: 7100-01 / 7100-01K
• CEF: 500107
• Ancor: 2040 / J050007
• Sierra Marine: 18-3081
• Caterpillar: 232-3198
• Detroit Diesel: 5194205
• Northern Lights: 12-12060 / 25-12060
• Onan: 131-0050 / 132-0162
• Perkins: 0460038 / 24880190
• Vetus: IMP00201
• Volvo Penta: 825940, 829940, 860203, 875811, 8758112, 876243, 877400, 925940, 3855546, 3856039, 3856039-7, 3858256, 3862465, 3862567, 21951346
• Westerbeke / Universal: 302571
• Yanmar: 129470-42530, 129470-42531, 129470-42532, 129670-42530, 129670-42531

Dimensional or Different-Material Counterparts

• Jabsco 1210-0003, JMP 7100-02, CEF 500207, Ancor J050407 and SPX Johnson 09-1027B-9 - nitrile material counterparts

📦 Condition

• Brand-new aftermarket replacement impeller
• New and unused
• Supplied in suitable manufacturer or equivalent protective packaging