JMP Marine JSK0099 Volvo Penta D5/D7 Engine Cooling Seawater Pump Major Service Kit
When a raw water pump starts weeping at the seal or the shaft develops play, an impeller alone will not fix it. The JMP Marine JSK0099 is the full major service kit for that job — every internal wear part needed to take a tired Volvo Penta D5/D7 engine cooling pump back to as-new condition on the bench. It covers the JMP JPR-VP0050D pump and the units it replaces, including Volvo Penta 3838288 and Johnson 10-24580-01, so one part number handles the rebuild regardless of which of those pumps is sitting on the front of the engine.
Inside the kit are eighteen components: the flexible impeller, cam set, wear plate, spacer, end cover plate with hex screws and gasket, mechanical seal set with snap ring, both bearings, the shaft, gear key, o-ring, oil seal retainer, spring washer, hex bolt, nut for the bearing housing, and the large retaining snap ring. That combination is what separates a major kit from a minor one — you are replacing the rotating assembly and the sealing surfaces together, which is the only way to cure a leak that has already started to wash out the bearings.
Rebuilding rather than replacing the whole pump is usually the sensible call on these engines, and the economics are hard to argue with. The kit ships as a complete set so there is no chasing individual seals and snap rings mid-teardown, and the parts are dimensionally matched to the original JMP pump housing. Plan the work with the engine cold and the seacock closed, and keep the old cam and wear plate for comparison — reading the wear pattern on the parts you remove tells you a great deal about how the pump has been running.
Key Features
- Complete 18-piece major service kit for a full pump rebuild, not a partial refresh
- Includes flexible impeller, cam set, wear plate, and spacer for restored priming and flow
- Mechanical seal set with snap ring to stop shaft weep and protect the bearing housing
- New shaft, dual bearings, gear key, and large snap ring for a fully renewed rotating assembly
- End cover plate, gasket, and hex screws included for a clean, leak-free reassembly
- O-ring, oil seal retainer, spring washer, hex bolt, and bearing housing nut supplied
- Direct-fit components matched to original JMP pump dimensions and tolerances
- Restores a worn pump for a fraction of the cost of a complete pump replacement
Applications
- JMP Marine seawater pump JPR-VP0050D
- Volvo Penta 3838288 engine cooling pump
- Johnson Pump 10-24580-01
- Volvo Penta D5A-A T and D5A-A TA engines
- Volvo Penta D7A-A T and D7A-A TA engines
- Volvo Penta D7C-A TA engines
- Volvo Penta D7A-B TA engines
- Volvo Penta D7C-B TA engines
Specifications
- Part number: JSK0099
- Brand: JMP Marine
- Type: Major service kit (full internal rebuild)
- Component count: 18 pieces
- Services pump: JPR-VP0050D
- Pump port size: 1 in. hose connection, inlet and outlet
- Impeller type: flexible rubber, replaces JMP 7400-01K
- Seal type: mechanical seal set with snap ring
- Bearings: two, supplied with spring washer, hex bolt, and housing nut
- Cover: end cover plate with gasket and hex screws
- Approximate kit weight: 3.00 lbs / 1.40 kg
Frequently Asked Questions
Q: What is the difference between the JSK0099 major kit and a minor service kit?
A: The minor kit covers the wet-end wear items — impeller, cam, wear plate, gasket, and o-ring. The JSK0099 goes further and adds the shaft, both bearings, the mechanical seal set, and the associated hardware, so it also fixes shaft play and seal leakage rather than just restoring flow.
Q: How do I know when a major rebuild is needed instead of just a new impeller?
A: Grab the pump pulley or drive end and check for side-to-side movement, then look for salt crust or drips at the weep hole between the pump body and the bearing housing. Play at the shaft or any sign of water tracking past the seal means the bearings and seal are involved, and a major kit is the correct repair.
Q: Do I need special tools to install this kit?
A: A bench vise, snap ring pliers, and a press or suitable driver for the bearings and seal make the job straightforward. The pump should come off the engine and be rebuilt on a bench — pressing bearings and seating a mechanical seal squarely is not practical in place.
Q: Should the pump be primed or lubricated before first start?
A: Yes. Coat the impeller vanes and the cam with a marine-safe glycerin or impeller lubricant before final assembly, never petroleum grease, and confirm water flow at the exhaust within the first few seconds of running.
Q: How often should this level of service be performed?
A: Impellers are typically inspected annually or every 200 to 300 hours, while a full major rebuild is driven by condition rather than a calendar — most pumps reach that point after several impeller cycles, or sooner in silty, sandy, or heavily used raw water conditions.
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