Product Overview
Reliable custom rubber parts for industrial applications
Quick Answer
The K-29000 marine engine rubber impeller is a flexible vane pump component for replacement, cooling circulation, maintenance service and compatible fluid handling applications. Dimensions, blade profile, hub structure, shaft connection, rubber compound, Shore A hardness, tolerance and packaging must be confirmed by drawing, official specification or physical sample before production.
The K-29000 marine engine rubber impeller is a flexible vane pump component used as a replacement reference for compatible marine engine pump systems. This page does not assume unconfirmed dimensions, material grade, hardness or insert details. Outer diameter, height, blade profile, shaft connection and rubber compound should be confirmed by drawing, official specification or physical sample.
Product Overview
The Sherwood 29000K Rubber Impeller is a 12-vane flexible Neoprene impeller manufactured as a direct-fit replacement for Sherwood raw-water engine cooling pumps used across a wide range of marine diesel and gasoline engines. It features a 45-degree, 10-tooth splined drive hub with a threaded insert, allowing the impeller to be removed easily using a standard impeller puller tool. It is widely cross-referenced to Caterpillar, Cummins, and John Deere marine diesel engine cooling pump applications, making it one of the standard reference impellers used across commercial and recreational marine engine cooling systems.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 29000 / 29000K (kit) / 29000K-SHW |
| Material | Neoprene rubber |
| Number of Blades | 12 vanes |
| Impeller Diameter | 95 mm (3-3/4″) |
| Impeller Width/Depth | 101.5–102 mm (4″) |
| Shaft Hub Diameter | 23.8 mm (15/16″) |
| Hub Insert Type | 45° 10-Tooth Spline Drive, threaded for puller removal |
| Operating Temperature Range | 7°C to 82°C (45°F to 180°F) — max continuous 130°F for some ratings |
| Fluid Compatibility | Fresh water, salt water, minor oil/diesel exposure |
| Approx. Weight | 1.65 lbs (~0.75 kg) |
| Kit Contents (29000K) | Impeller, O-ring/Quad ring, retaining pin, technical guide |
What Is the Sherwood 29000K Impeller?
The Sherwood 29000K is a flexible Neoprene rubber impeller with 12 curved vanes mounted on a splined brass drive hub, designed for use in bronze-bodied Sherwood raw-water pumps that circulate seawater or freshwater for marine engine cooling. As the pump shaft rotates, the flexible Neoprene vanes deform and re-expand within the pump housing to draw in and discharge cooling water — a self-priming action characteristic of flexible impeller pump design. The threaded spline insert is a key design feature, allowing technicians to thread a standard impeller puller directly into the hub for fast, damage-free removal during service — eliminating the need to pry the impeller from the pump body.
Cross-Reference & Compatibility
| Brand | Part Number |
|---|---|
| Sherwood | 29000, 29000K, 29000K-SHW |
| Caterpillar (CAT) | 2968388 |
| Cummins | 4933742 |
| John Deere | DZ108622 |
| JMP Marine (aftermarket) | 8359-01, 8359-01K (kit) |
Pump applications: Sherwood G2900 series pumps — G2902-01, G2902X, G2903-01, G2903X, G2904-01, G2904X. This same impeller family is also used across the Sherwood 17000, 18000, 22000, and 26000 series pump bodies, and historically fitted to Volvo Penta MD40, TMD40, TAMD40, AQD40, and AQAD40 marine engines.
Why Neoprene Is Used for This Impeller
- Wide chemical resistance — Neoprene tolerates exposure to fresh water, salt water, and minor amounts of oil or diesel fuel commonly present in engine cooling and bilge circuits
- Proven temperature range — rated for continuous service between 7°C and 82°C, matching typical raw-water engine cooling circuit conditions
- Industry-standard flexibility — Neoprene remains the most widely used impeller material across marine raw-water pump platforms due to its balance of flexibility, wear resistance, and cost
- Reliable spline engagement — the molded-in 10-tooth spline drive insert with 45° tooth angle ensures secure, slip-free torque transfer while the threaded center allows tool-assisted extraction
Installation & Maintenance Notes
- Dry-running caution — like all flexible impeller pumps, this impeller must never be run dry, even briefly, as the Neoprene vanes can overheat and deform without water lubrication and cooling
- Recommended replacement interval — typically every 1–2 boating seasons, or per engine manufacturer service schedule, to prevent unexpected cooling failure
- Service kit availability — supplied as a complete kit (29000K) including O-ring/quad ring, retaining pin, and technical installation guide for a full service replacement in one part number
- Puller-tool removal — the threaded 10-tooth spline hub allows use of a standard impeller puller for fast, non-destructive removal, reducing pump housing damage risk during service
- Installation orientation — vane curvature must be installed in the correct rotational direction per the pump housing orientation to ensure proper self-priming function
Applications
- Sherwood G2900 series raw-water engine cooling pumps (G2902/G2903/G2904 variants)
- Caterpillar marine diesel engine cooling circuits
- Cummins marine diesel engine cooling pumps
- John Deere marine diesel engine cooling pumps
- Historical Volvo Penta MD40/TMD40/TAMD40/AQD40/AQAD40 engine cooling pumps
- General bronze flexible impeller pump bodies for engine cooling and raw-water transfer
Custom & OEM Manufacturing Capability
- Material options — NBR, NR, EPDM, Silicone, Neoprene (ACM), HNBR, SBR
- Hardness range — 30–95 Shore A
- Temperature range — -40°C to +300°C depending on compound selection
- Dimensional tolerance — ±0.05 mm
- Hub options — threaded spline drive, keyed hub, double flat drive, or custom insert configuration
- Certification — ISO 9001 compliant manufacturing available
- Custom branding — OEM and ODM orders accepted with customer logo and packaging
Why Source from Julong Rubber?
- Marine engine cooling application experience across commercial and recreational vessels
- Full cross-reference matching engineered to Sherwood, Caterpillar, Cummins, and John Deere dimensional equivalents
- ISO 9001 certified manufacturing and inspection
- Full elastomer range — Neoprene as standard, plus NBR, NR, EPDM, Silicone alternatives
- Precision threaded-spline hub molding — secure torque transfer with tool-assisted removal capability
- Low MOQ with tiered volume pricing
- Fast delivery for stock cross-reference parts
- OEM/ODM capability — custom logo, packaging, and specification accepted
Customization Options
Custom marine engine rubber impellers can be manufactured from 2D drawings, 3D models, pump assembly drawings, official specifications or physical samples. Buyers can specify the outer diameter, overall height, blade quantity, blade profile, hub diameter, shaft hole, insert structure, rubber material, Shore A hardness, dimensional tolerance and packaging method. If the product is intended as a K-29000 replacement reference, the original impeller or confirmed specification should be provided before tooling review. Material selection should consider water exposure, coolant additives, temperature, speed, dry-running risk, chemical contact and required documentation.
What Information Should Buyers Provide for a Quote?
- Product drawing or physical sample
- K-29000 reference part number
- Pump model and installation position
- Outer diameter
- Overall height
- Hub diameter and hub structure
- Shaft hole or shaft connection detail
- Blade quantity and blade profile
- Insert structure, if applicable
- Dimensions and tolerances
- Rubber material
- Shore A hardness
- Operating temperature
- Contact media
- Rotation speed
- Rotation direction
- Required quantity
- Estimated annual volume
- Compliance requirements
- Packaging requirements
FAQ
Can this impeller be supplied as a K-29000 replacement?
Yes, the product can be reviewed as a replacement reference for K-29000 marine engine pump applications. However, the part number alone is not enough for production approval. Dimensions, blade profile, shaft connection, rubber compound and pump compatibility must be confirmed before manufacturing.
Why are exact dimensions not listed on this page?
Exact dimensions are not listed because no confirmed drawing, official specification or measured sample data has been provided. For rubber impellers, unsupported dimensions can cause installation problems, reduced flow, excessive friction or early blade damage. Confirmed data is required before production.
Can the impeller be manufactured from an old sample?
Yes. A physical sample can be used for reverse engineering when the original drawing is unavailable. The sample should be checked for wear, deformation and blade damage. Critical dimensions, pump chamber clearance and operating conditions should still be confirmed before tooling.
How should buyers select the rubber material?
Rubber material selection depends on the working liquid, coolant additives, temperature, rotation speed, dry-running risk, oil exposure and chemical contact. Buyers should provide the exact media and service conditions. Material selection depends on the application conditions.
Is tooling required for this rubber impeller?
Tooling is usually required for molded rubber impellers with custom blade geometry, hub structure or insert design. Tooling cost depends on the drawing and product structure. Prototype samples can be reviewed before batch production.
Are samples available before bulk production?
Samples are available upon request. Sample preparation depends on the confirmed dimensions, rubber compound, Shore A hardness, insert structure, tooling status and inspection requirements. Please provide a drawing, official specification or physical sample for review.
Request a Custom Quote
Send your K-29000 marine engine rubber impeller drawing, official specification, pump model or physical sample for review. Please include dimensions, shaft connection, blade profile, rubber material, hardness, working liquid, temperature, speed, rotation direction, quantity and packaging requirements.
