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Flexible Rubber Water Pump Impeller 09-842B – 12 Blade Neoprene Spline – Fits Johnson F98
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How to Match This Part
This is a flexible rubber raw water pump impeller. It sits inside the pump housing behind the cover plate and is driven by a splined shaft. It replaces the primary original part number Johnson 09-842B for the Johnson F98 pump.
Match this part by checking your engine in this order:
1. Original impeller part number (stamped on the old impeller or listed in the pump section of your parts catalog)
2. Blade count (this listing is 12 blades)
3. Drive type (this listing is a spline hub, about 25.4 mm / 1 in bore)
4. Diameter and width (this listing is 95 mm diameter and 180 mm wide, not F95 09-820B which is 130 mm wide)
Identify it physically before ordering. Johnson 09-842B is a tall 12-blade neoprene impeller, 95 mm diameter and 180 mm wide, with a brass spline insert. Catalog photos of the service pack show an O-ring and lubricant; this listing is the impeller only. SPX Johnson charts do not list a Jabsco equivalent for the F98 impeller.
- ✓ Primary OEM: Johnson 09-842B
- ✓ Product form: 12-blade neoprene impeller, brass spline insert, 95 × 180 mm
- ✓ Fitment: part number, then 180 mm vs 130 mm F95 09-820B
Part Number Cross-Reference
Use this table to confirm equivalent part numbers. Genuine Johnson service kits include an O-ring and glycerine. This listing is the impeller only.
| Type | Brand | Part Number | Notes |
|---|---|---|---|
| OEM | Johnson Pump (SPX Flow) | 09-842B | Primary reference. F98 pump, 12-blade neoprene, spline, 95 × 180 × 25.4 mm |
| OEM | Johnson Pump (SPX Flow) | 09-842B | Excel also lists this number on a Jabsco row; SPX charts show no separate Jabsco equivalent for F98 |
| Other brand | Industry interchange | 1251 | Source-sheet other-brand number |
Compatible Engine Models
Confirm the original impeller number and measure 180 mm width on a 95 mm 12-blade spline impeller. Do not assume every Johnson F9 / F95 pump uses this impeller.
| Brand | Engine / Pump Model | Original Part No. | Notes |
|---|---|---|---|
| Johnson Pump | F98 (pump model) | 09-842B | 12-blade neoprene, spline, 95 × 180 mm |
Technical Specifications
| Specification | Value |
|---|---|
| Part type | Flexible rubber impeller, raw water pump |
| Number of blades | 12 |
| Impeller diameter (A) | 95 mm |
| Impeller width / depth (B) | 180 mm |
| Shaft bore diameter (C) | 25.4 mm (1 in) |
| Insert / drive type | Spline |
| Insert material | Machined brass |
| Vane material | Neoprene rubber (cooling service) |
Package Contents
This listing is for the impeller only. Product photos of a genuine-style pack show an O-ring and lubricant sachets; those extras are not included. Please refer to the part number cross-reference table to confirm component details.
Cover gasket, O-ring and lubricant are not included.
Installation Guide
- 1 Stop the engine, let it cool, and close the raw water seacock so water cannot enter the boat while the pump is open.
- 2 Remove the cover plate screws and lift off the cover. Keep the screws and the old gasket together so you can compare the seal size when reassembling.
- 3 Note the spline orientation, then grip the brass insert and pull the old impeller straight off. This impeller is 180 mm wide; recover any broken vane pieces from the downstream cooling circuit before continuing.
- 4 Clean the housing bore and the wear plate, and inspect them for scoring. Apply a marine-grade impeller lubricant, glycerine or soapy water to the bore and the new vanes. Do not use petroleum-based grease, which attacks neoprene.
- 5 Align the spline insert with the pump shaft, then press the impeller in while turning the shaft in the normal direction of rotation so all twelve vanes lay over the same way.
- 6 Refit the cover plate with a serviceable gasket or O-ring, tighten the screws evenly in a crisscross pattern, open the seacock, then start the engine and confirm a solid stream of cooling water and no leaks at the cover.
Note: Professional installation is recommended to ensure safety and optimal performance.
Troubleshooting & FAQ
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist, even if your model is listed, do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- This listing is the 180 mm F98 impeller. It will not fit F95 09-820B, which is 130 mm wide on the same 95 mm diameter.
- The impeller is supplied on its own. Cover seals and lubricant must be ordered separately if your service procedure requires them.
- Never run the pump dry. Even a few seconds without water will damage the neoprene vanes.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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