Volvo Penta Seawater Pump Impeller Kit 24699834

Volvo Penta Seawater Pump Impeller Kit — 24699834

What This Part Does

The 24699834 is the current genuine Volvo Penta OEM seawater pump impeller kit for selected 40-, 60-, 70-, 100-, and 120-series marine diesel engines. The flexible rubber impeller is the wear component inside the raw-water pump that draws seawater from the vessel’s intake and circulates it through the engine’s cooling circuit. Impellers are a routine service item — the rubber vanes harden, crack, and fatigue over time and with heat exposure, and a failed impeller can shed vane fragments downstream into the heat exchanger and cooling circuit. 24699834 is the current Volvo Penta replacement for 21951360 and a long chain of earlier part numbers across the 40- through 120-series engine families.

This is one of Volvo Penta’s larger seawater-pump impellers: approximately 95 mm diameter × 63 mm wide, with a 25 mm splined hub and 9 flexible vanes.

Compatible Applications

• AD40B
• AQAD40A / AQAD40B
• AQD40A
• MD40A
• TMD40A / TMD40B / TMD40C
• TAMD40A / TAMD40B
• TAMD61A
• TAMD62A
• TAMD63L-A / TAMD63P-A
• TAMD70D / TAMD70E
• TAMD71A / TAMD71B
• TAMD72A
• TAMD73P-A / TAMD73WJ-A
• TAMD74A
• TAMD74C-A / TAMD74C-B
• TAMD74L-A / TAMD74L-B
• TAMD74P-A / TAMD74P-B
• TAMD75P-A
• MD100 / TMD100 / D100 (selected applications)
• MD120 / TMD120 / TAMD120 / TAD120 / TD120 (selected applications)

Confirm by engine model, serial number, and the seawater-pump impeller position in the applicable Volvo Penta cooling-system diagram. Volvo Penta used several impeller sizes across similar engine families — the existing impeller part number or the cooling-system diagram is the strongest confirmation.

Serial Number & Fitment Notice

The best match indicators for 24699834 are:

• Current Volvo Penta number 24699834
• Previous Volvo Penta number 21951360
• Older Volvo Penta references: 875736, 875660, 807904, 21430184, 21730344
• Johnson Pump equivalent: 09-1029B
• Jabsco equivalents: 836-0001 / 836-0001B / 17935-0001

If the old impeller carries any of these numbers, confirm against the engine model and serial number, then order 24699834 as the current Volvo Penta OEM service reference.

When to Replace

• Scheduled seawater-pump maintenance — annual service or per the engine service schedule
• Vanes are cracked, hardened, torn, or permanently bent
• Reduced cooling-water flow or unexplained rise in engine temperature
• Pump has operated dry even briefly
• One or more vanes are missing from the impeller
• Seawater pump opened for any reason after an overheating event

Important: If an impeller is found with missing vanes, the broken fragments must be located and removed from the downstream cooling circuit — heat exchanger, hoses, and thermostat housing — before returning the engine to service. Fragments left in the circuit will block cooling flow and cause repeat overheating.

Service Interval

Replace annually or per the Volvo Penta service schedule for your specific engine model. Impellers can fail suddenly after dry operation, overheating, or extended service beyond the recommended interval. Proactive annual replacement is lower cost and risk than an in-service failure at sea. Inspect the pump cover, wear plate, and shaft splines at each impeller service.

Installation Notes

• Close the seawater intake seacock before opening the pump cover
• Note the direction of impeller vane curl before removing the old impeller — the new impeller must be installed to rotate in the same direction
• Inspect the pump cover and internal wear surfaces for scoring — a scored cover will damage a new impeller quickly
• Inspect the shaft and splines for wear or corrosion
• Lubricate the new impeller with an approved impeller lubricant or clean seawater before installation — do not run dry even for a few seconds
• Install a new cover gasket or O-ring where supplied with the kit
• If the old impeller was found with missing vanes, inspect and flush the downstream heat exchanger, hoses, and thermostat housing before reassembly
• Open the seacock and check for leaks before starting the engine
• Verify strong cooling-water discharge flow immediately after startup

Alternate & Superseded Part Numbers

Volvo Penta:

• 24699834 — current number (this kit)
• 21951360 — previous number
• 21730344
• 21430184
• 875736 / 875736-1
• 875660 / 875660-3
• 807904
• 825942

Aftermarket / Equivalent References:

• Johnson Pump 09-1029B
• Jabsco 836-0001 / 836-0001B
• Jabsco 17935-0001 / 17935-0001-P
• Caterpillar 1L4774
• Detroit Diesel 5193553

Technical FAQ

Q: My existing impeller is marked 21951360. Is 24699834 the correct replacement?
A: Yes. Volvo Penta identifies 24699834 as the current replacement for 21951360. Confirm against your engine model and serial number as a final check.

Q: Do I need to replace the full seawater pump assembly, or just the impeller?
A: If the pump body, shaft, bearings, shaft seal, and cover wear surface are all in good condition, replacing the impeller kit is sufficient. Inspect the pump housing bore for scoring and the shaft for play when the pump is open. If the housing is scored or the shaft is loose, the full pump assembly should be replaced.

Q: One of the impeller vanes is missing. What should I do before reinstalling?
A: Locate and remove the missing vane from the downstream cooling circuit before running the engine. Check the heat exchanger, hoses, and thermostat housing. A vane fragment lodged in the heat exchanger or thermostat will restrict cooling flow and cause the engine to overheat again even with a new impeller installed.

Q: How often should I replace this impeller?
A: Annually or per the Volvo Penta service schedule for your engine. Impellers on these engines are a calendar-service item — the rubber degrades with heat and time regardless of hours run. Proactive annual replacement is the standard practice for any vessel that depends on the engine for safety.

Q: Can I use a Johnson Pump 09-1029B or Jabsco 836-0001 instead of the OEM impeller?
A: These aftermarket impellers are listed as equivalents for this application. The OEM Volvo Penta kit 24699834 is the factory-specified replacement. If using an aftermarket equivalent, confirm the impeller dimensions (95 mm OD × 63 mm width × 25 mm hub, 9 vanes, splined hub) match exactly before installation.

Q: What causes impeller failures between service intervals?
A: The most common causes are dry operation (engine started without opening the seacock, or a blocked intake strainer starving the pump), operation after an overheating event that hardened the rubber, or an impeller installed beyond its service interval. Always check the seacock and intake strainer condition when investigating early impeller failure.

Parts Desk Insights

24699834 is one of Volvo Penta’s larger-diameter impellers and covers an unusually wide range of engine families — 40-, 60-, 70-, 100-, and 120-series diesels. The long supersession chain (21951360, 875736, 875660, 807904, 21430184, 21730344) means a lot of older engines with different part numbers on the existing impeller will land on this kit. The most common issue is a customer who pulls an old impeller marked with one of the older numbers and needs confirmation that 24699834 is the current OEM equivalent — match by old number and engine model, and it’s a straightforward order. The other routine situation is the missing-vane conversation: any time a customer reports an impeller failure, ask whether the pump had vanes missing and whether the downstream circuit was inspected. A blocked heat exchanger is the usual reason a new impeller fails again within the same season.