Searching for 46-807151 is a starting point, not enough information to order a seawater pump. The letters and numbers that follow it matter. A body-and-impeller kit, a replacement housing and a pump assembly can share that number stem while containing very different parts.
For an engine whose parts lookup calls for the one-piece body kit, Quicksilver 807151A14 is a clearly identified option. Before buying, match the full part number to your engine serial number and the pump actually installed. A listing that mentions MerCruiser, Bravo or your engine displacement alone does not settle compatibility.
What the 46-807151 suffix tells you
A useful example comes from Mercury’s parts diagram for the 1997 350 MAG Bravo MPI (Gen+) GM 350 V-8, serial 0K001501 and up. In that specific catalog, the two suffixes below identify different levels of assembly. They are not a general interchangeability chart for other engines.
| Full number | What the cited source identifies | Buying implication |
|---|---|---|
| 46-807151A9 | Seawater pump assembly in the specified 1997 diagram | Do not substitute a body kit simply because the number stem matches. |
| 46-807151A7 | One-piece water pump body in that same diagram | A body is a component of the pump, not the entire assembly. |
| 807151A14 | Quicksilver seawater pump body kit on Mercury’s current product page | Verify the kit application and contents separately from complete-pump listings. |
The diagram also lists a shaft, bearings, oil seals, pulley and bracket separately. That is why the word “complete” in a seller’s title deserves scrutiny: ask what is included and what must transfer from the existing installation. An aftermarket cross-reference may describe the portion it replaces rather than everything supplied under an original assembly number.
Quicksilver 807151A14: the body-kit option
Mercury identifies 807151A14 as a seawater pump body kit for MerCruiser engines with a one-piece, engine-mounted seawater pump. It is worth considering when a serial-specific lookup and inspection confirm that this is the kit your existing pump needs.
Quicksilver 807151A14 Sea Water Pump Body Kit
As an Amazon Associate we earn from qualifying purchases.
The matching Amazon listing identifies Quicksilver part 807151A14 and lists a housing, impeller, wear plate, O-ring, seven screws and five washers. It describes a phenolic-resin body. Those contents do not include a shaft, bearings, pulley or mounting bracket. Check the seller’s current package details before ordering, especially if a mechanic has recommended a whole-pump replacement.
Choose it for: a confirmed body-and-impeller repair on a compatible pump whose other required components will be retained. Pause before ordering: if the repair diagnosis includes the shaft, bearing housing, pulley or other components outside the listed kit. Buying a kit first and diagnosing the rest later can leave you with an incomplete repair.
One-piece versus two-piece pumps
Older installations need extra care. Mercury’s December 1996 parts bulletin 96-8, preserved by a marine-parts supplier, documents a change from a two-piece plastic pump body to a one-piece design. It says the newer body could service many older pumps, then separates applications that retained the two-piece arrangement.
The exceptions include TR/TRS engines with a Mercury Marine transmission and high-performance engines with a solid-plate front engine mount. The bulletin lists 46-807151A14 for the other applications specified there. Its broad model labels belong to that historical bulletin’s scope; they should not be read as approval for every engine or Bravo installation sold since.
Use this history to ask better questions, not to skip a current parts check. A decades-old boat may also have received a replacement engine or pump. If the catalog illustration does not resemble the installed hardware, have a marine parts specialist reconcile the difference before ordering. Photographs of the pump, connections and mounting arrangement can help.
How to compare aftermarket options
Sierra 18-3150: establish exactly what is in the package
Sierra’s 18-3150 instruction sheet identifies a plastic, one-piece Bravo water-pump housing. It provides component-specific fastening instructions and warns against overtightening. The sheet is not a complete application chart or a package inventory.
If you consider a listing under this number, obtain the seller’s exact contents and the manufacturer’s application confirmation for your engine and installed pump. Do not assume that an impeller, wear plate, seals and all required hardware are supplied just because another seller’s body kit includes them. Installation specifications must come from the instructions for the actual part and engine.
Hardin 625-4178: account for fittings and installation differences
Hardin’s 625-4178 overhaul kit uses a 316L stainless-steel impeller housing. The manufacturer lists an impeller, O-rings, stainless wear plates and fastening hardware. Its inlet and outlet have 1-inch NPT female ports, and the page explicitly says that fittings are required.
That makes fitting selection, hose routing and clearance part of the comparison. Confirm the appropriate fittings and exact application with Hardin or your installer, rather than treating its broad replacement-number list as proof of a complete drop-in pump assembly. Stainless construction alone does not establish a service-life advantage for your boat or remove the need to maintain the impeller.
The fitment checklist to finish before paying
Begin with Mercury’s parts finder. Mercury’s catalog guidance recommends the engine serial number for identifying parts. Then compare the result with what is physically installed.
- Record the engine identification. Keep the full engine model and serial number together. The boat model, approximate year or displacement alone is an incomplete purchasing brief.
- Write down the full replacement number. Include its suffix and any documented supersession. Ask the supplier to explain a different number rather than assuming it is a newer equivalent.
- Confirm the pump configuration. Identify one-piece or two-piece construction, the existing body and the assembly your mechanic intends to retain.
- Check the drive and mounting details. For a replacement assembly, have the supplier verify pulley and belt type, bracket arrangement and any fuel-pump mounting provision your installation uses. A matching impeller cavity does not settle those interfaces.
- Compare the connections. Verify hose size, port direction, fittings and surrounding clearance, particularly when changing housing design.
- Get a written contents list. Separate supplied components from reused parts, required fittings and other items on the repair estimate.
- Read the return conditions. Resolve fitment before opening or installing the part, and check how the seller treats opened or installed engine components.
Installation and cooling-system precautions
A shopping guide cannot establish the cause of an overheating problem or replace your engine’s service manual. Have a qualified marine technician determine the repair scope when the pump’s condition or the installed configuration is uncertain. Follow the exact owner’s manual for inspection and replacement intervals, and the engine and part instructions for installation.
Do not start the engine for a quick dry test. Mercury’s service team explains that the impeller needs a continuous water supply when running and can be damaged quickly without it. Use only the cooling-water supply and test procedure prescribed for your particular installation.
Which 46-807151 replacement should you buy?
If the verified application calls for 807151A14 and the repair requires its listed components, the Quicksilver body kit is a straightforward candidate. If you need a housing-only alternative, a stainless conversion or a full pump assembly, compare the different scope and installation requirements before comparing cost. The right purchase is the full, confirmed part number for the pump on your engine, with all required components accounted for.
