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Flexible Rubber Water Pump Impeller 836-0001 – 9 Blade Neoprene 95 mm Spline – Fits Yanmar 127881-42050
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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 Jabsco 836-0001, and is also supplied against JMP 8000-01, Johnson 09-1029B, DJ 003-0901, Kashiyama SP-200 / SP-220 and Yanmar 127881-42050.
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 9 blades)
3. Drive type (this listing is a 12-spline hub, 25 mm bore)
4. Pump model (cast or labelled on the pump body)
Identify it physically before ordering. This impeller has nine vanes moulded in black neoprene around a machined brass 12-spline insert. JMP 8000-01 is 95 mm diameter, 63 mm width and 25 mm bore. An isometric product photo can look like ten vanes; JMP, Johnson 09-1029B and DJ 003-0901 all specify nine. It is not interchangeable with 12-blade 25 mm 09-821B or 82 mm 12-blade 7608-01.
- ✓ Primary OEM: Jabsco 836-0001
- ✓ Product form: 9-blade neoprene impeller, brass 12-spline insert, 63 mm width, 25 mm bore
- ✓ Fitment: part number, then blade count, then drive type
Part Number Cross-Reference
Use this table to confirm equivalent part numbers. Jabsco 836-0001-P is a kit-style number. This listing is the impeller only.
| Type | Brand | Part Number | Notes |
|---|---|---|---|
| OEM | Jabsco Pump | 836-0001 | Primary reference. 9-blade neoprene, 12-spline |
| OEM | Jabsco Pump | 836-0001-P | Jabsco kit-style number. Impeller only is sold here |
| OEM | SPX Flow Johnson Pumps | 09-1029B | Johnson 9-blade equivalent |
| OEM | JMP Pump | 8000-01 | JMP 9-blade 12-spline equivalent |
| OEM | DJ Pump | 003-0901 | 9-blade spline equivalent |
| OEM | Kashiyama | SP-200 | Source-sheet Kashiyama number |
| OEM | Kashiyama | SP-220 | Source-sheet Kashiyama number |
| OEM | Yanmar | 127881-42050 | Yanmar raw-water pump impeller |
| OEM | Cummins Onan | 160596 | Cummins Onan impeller number |
| OEM | Cummins Onan | 166758 | Cummins Onan impeller number |
| OEM | Cummins Onan | 556540 | Cummins Onan impeller number |
| OEM | Cummins Onan | 556850 | Cummins Onan impeller number |
| OEM | Cummins Onan | 21601R | Cummins Onan impeller number |
| OEM | Caterpillar | 1L4774 | CAT raw-water pump impeller |
| OEM | Nikkiso | F40CBC | Source-sheet Nikkiso number |
| OEM | Perkins | 460027 | Perkins raw-water pump impeller |
| Other brand | Industry interchange | K-174 | Source-sheet other-brand number |
| Other brand | Industry interchange | 888-174 | Source-sheet other-brand number for this SKU |
Compatible Engine Models
Confirm the original impeller number and count nine blades on a 25 mm 12-spline hub. Do not assume every Yanmar, Cummins, Volvo TAMD or CAT diesel uses this part.
| Brand | Engine / Pump Model | Original Part No. | Notes |
|---|---|---|---|
| Jabsco / Johnson / JMP / DJ / Kashiyama / Nikkiso | Pumps specified for 836-0001, 09-1029B, 8000-01, 003-0901, SP-200 / SP-220 or F40CBC | 836-0001, 09-1029B, 8000-01, 003-0901, SP-200, SP-220, F40CBC | 9-blade, 12-spline, 95 × 63 × 25 mm |
| Yanmar | Engines whose parts list calls for 127881-42050 | 127881-42050 | Match the original number rather than a 6LY family dump |
| Cummins Onan | Engines whose parts list calls for 160596, 166758, 556540, 556850 or 21601R | 160596, 166758, 556540, 556850, 21601R | Match the original number |
| Caterpillar / Perkins | Engines whose parts list calls for 1L4774 or 460027 | 1L4774, 460027 | Match the original number |
Technical Specifications
| Specification | Value |
|---|---|
| Part type | Flexible rubber impeller, raw water pump |
| Number of blades | 9 |
| Impeller diameter (A) | 95 mm |
| Impeller width / depth (B) | 63 mm |
| Shaft bore diameter (C) | 25 mm |
| Insert / drive type | 12-spline |
| Insert material | Machined brass |
| Vane material | Neoprene rubber |
Package Contents
This listing is for the impeller only, as shown in the impeller in the product images. Please refer to the part number cross-reference table to confirm component details.
Cover gasket, O-ring and lubricant are not included. JMP 8000-01K adds a cover gasket (GAK0007), an O-ring (ORG0015) and lubricant. Jabsco 836-0001-P is a kit-style number; the impeller only is sold here.
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. 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 in the brass insert with the pump shaft, then press the impeller in while turning the shaft in the normal direction of rotation so all nine vanes lay over the same way.
- 6 Refit the cover plate with a serviceable gasket, 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.
- The impeller is supplied on its own. Cover seals and lubricant must be ordered separately if your service procedure requires them.
- This is a 9-blade, 95 mm 12-spline impeller, 63 mm wide with a 25 mm bore. It will not fit 12-blade 25 mm 09-821B or 82 mm 12-blade 7608-01.
- 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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