Johnson Pump F4B Impeller Kit 09-1026B-1 | Replaces Jabsco 673-0001
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Johnson Pump F4B Impeller Kit 09-1026B-1
Part Number: 09-1026B-1 (also shown as 091026B1) | UPC: 7330717008758
The Johnson Pump 09-1026B-1 is a genuine F4 / F4B flexible impeller service kit for marine engine raw-water cooling pumps. It uses Johnson's MC97 / EPDM cooling-water compound in a 6-blade, pin-drive configuration engineered to deliver dependable raw-water flow through compatible F4-series pumps.
Impeller Specifications
- Pump family: Johnson Pump F4 / F4B
- Material: MC97 / EPDM cooling-water compound
- Number of blades: 6
- Drive type: Pin drive
- Outside diameter: 2.00 in. / 50.8 mm
- Width: 0.87 in. / 22 mm
- Hub / bore diameter: 0.50 in. / 12.7 mm
Kit Contents
- 09-1026B-1 F4B flexible impeller
- 01-42391 gasket
- 01-45284 pump gasket (F4B-9 applications)
- Impeller installation lubricant
Compatible Pump Models
- Johnson Pump F4
- Johnson Pump F4B
- Johnson Pump F4B-4
- Johnson Pump F4B-9
- Johnson Pump F4B-903
- Johnson Pump F4B/6-M
Compatible Applications
Cross-reference catalogs associate this impeller family with marine cooling systems from:
- Volvo Penta
- Perkins
- Westerbeke
- Yanmar
- Bukh
- Farymann
- Lombardini
- VM Motori
Always confirm fitment by matching the existing pump model and impeller number rather than engine brand alone.
Fitment Notice
Before ordering, confirm:
- Pump model and F4 / F4B designation
- Existing impeller number
- Pin-drive hub configuration
- Outside diameter: 2.00 in. / 50.8 mm
- Width: 0.87 in. / 22 mm
- Bore: 0.50 in. / 12.7 mm
Important: Johnson offers several F4 impellers with the same 2.00 in. / 50.8 mm outside diameter but different hub bores and drive styles. The Johnson 09-808B-1 uses a 0.47 in. / 12 mm bore, while 09-1026B-1 uses 0.50 in. / 12.7 mm. Matching the full impeller number and hub configuration is essential to ensure correct fit and pump performance.
OEM & Cross-Reference Part Numbers
- Johnson Pump: 09-1026B-1
- Also shown as: 091026B1
- Jabsco: 673-0001
- Perkins: 24880194
- Volvo Penta: 804696 / 875808 / 897055 / 3593659
- Westerbeke: 21218
When to Replace the Impeller
- Cooling-water flow becomes weak or intermittent
- Vanes are cracked, torn, stiff, or permanently deformed
- Missing blade material is found — inspect all downstream cooling passages for fragments before reassembly
- Pump has been run dry
- Engine has experienced overheating
- Annual raw-water pump maintenance is due
Installation Notes
- Shut off the raw-water supply before beginning work
- Remove the pump cover and extract the old impeller
- Inspect the old impeller for missing vane pieces — locate all fragments in the cooling circuit before closing up
- Inspect the cam, cover plate, and pump chamber for scoring or wear
- Confirm the pin-drive hub matches the pump shaft before installing the new impeller
- Lubricate the new impeller with the supplied or approved water-safe impeller lubricant
- Install the appropriate kit gasket for your pump model
- Rotate the pump shaft in its normal operating direction while seating the impeller
- Verify strong cooling-water flow immediately after startup
Related Parts
- Johnson Pump 09-1027B-10 Impeller Kit (F5)
- Johnson Pump 09-812B-1 Impeller Kit (F6)
- Johnson Pump 09-1028BT-1 Impeller Kit (F7)
- Johnson Pump 09-808B-1 Impeller Kit
- Johnson Pump 09-806B-1 Impeller Kit
- Johnson Pump 09-801B Impeller
- Johnson Pump 09-45825 Service Kit for F6B-9
- Johnson Pump 09-45587 Service Kit
- Seachoice 17781 Impeller Puller
- Volvo Penta 3593573 Impeller Kit – Raw Water Pump
- Jabsco Neoprene Impeller Kit 920-0001-P
- Jabsco Neoprene Impeller Kit 11979-0001-P
Parts Desk Insights
The Johnson 09-1026B-1 is the standard service impeller for F4 and F4B raw-water pumps used on a wide range of European and Asian diesel engines — Volvo Penta, Westerbeke, Perkins, Yanmar, Bukh, and others. It is a common annual service item on sailboats and trawlers where these engines are frequently found. The Volvo Penta cross-references (804696, 875808, 897055, 3593659) make it easy to confirm fitment on Volvo-powered vessels without having a Johnson pump number on hand.
The most common ordering mistake is selecting by outside diameter alone. Several Johnson F4 impellers share the 2.00 in. / 50.8 mm diameter but have different bore sizes and drive styles — the bore difference between 09-1026B-1 (0.50 in.) and 09-808B-1 (0.47 in.) is small but critical for a proper shaft fit. As with all impeller services, check the old impeller carefully for missing vane pieces before closing up the pump — fragments in the cooling circuit are a frequent cause of continued overheating after an otherwise successful service.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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