8M0071007 Circulating Pump Molded Hose · Fits MerCruiser 2.5L/3.0L inline-4 distribution block to water pump, Replaces 32-96879, 32-47640, 18-70931

8M0071007 Circulating Pump Molded Hose · Fits MerCruiser 2.5L/3.0L inline-4 distribution block to water pump, Replaces 32-96879, 32-47640, 18-70931

GHMarine circulating pump molded hose for select 2.5L / 3.0L inline-4 cooling systems — the short U-shaped hose from the distribution block to the circulating water pump. Replaces OEM 8M0071007 / 32-8M0071007 and legacy 32-96879, 32-47640. Also matches cross-refs 18-70931, 9-44050, and REC32-8M0071007. Confirm the original hose number, U-shape geometry, cooling route, engine model, and serial before you order.

Ships as one short U-shaped molded hose + two hose clamps. This is an engine-bay hose — not a Bravo/Alpha transom water-intake hose.

Which hose is this?

This is the short U-shaped circulating-pump molded hose on 2.5L/3.0L inline-4 engines that use the distribution-block-to-water-pump route. It is not a Bravo Design I/II transom intake hose, not an Alpha 3/4-inch or 5/8-inch transom hose, and not the longer V6/V8 circulating-pump hose family.

If you are not sure, check the number on the old hose or the cooling diagram: look for 8M0071007 / 32-96879 / 32-47640 on the short U between the distribution block and water pump — that is this SKU.

Signs yours is due

• 2.5L / 3.0L inline-4 only: the short U between the distribution block and circulating pump is soft, swollen, or chalk-cracked.
• Coolant weeps exactly at those two short-U ends — not at a Bravo/Alpha transom intake and not on the taller V6/V8 circulating-pump hose.
• After an overheat, the U has taken a permanent flatten and no longer clears the block — replace the molded U, do not stretch a straight hose into place.
• Divert: 4.3 / 5.0 / 5.7L tall 1-3/4-inch circulating hose → GH 18H1006. Transom water intake stamp 32-43437 / 32-41725-33 → those hose pages, not 18H1004.

Will it fit my drive?

This replacement molded hose is Compatible with select MerCruiser 2.5L / 3.0L inline-4 cooling systems that use the distribution-block-to-water-pump route (catalog representative years 1982–2003). Displacement alone does not prove fit — confirm the original hose number, U-shape geometry, cooling route, engine model, and serial against the table below.

*Catalog representative year band from PROmarine / Sierra evidence. Final fit is by original hose number + engine/SN / EPC — not horsepower alone.

OEM & swap numbers

Current OEM / service family is 8M0071007 / 32-8M0071007. Legacy numbers 32-96879 and 32-47640 are in the same 2.5L/3.0L hose route when the diagram matches. Aftermarket cross-refs below.

Wrong part? Read before you order

• NOT for V6/V8 circulating pump hose 32-87108 / 18-71337 (see GH SKU 18H1006) — different displacement, length, and shape
• NOT for V6/V8 hose assembly with drain 32-861590A05 / 18-70944
• NOT for alternate inline hose route 32-52481
• NOT for Alpha/Bravo transom water-intake hose 32-41725-33 / 32-43437 (transom circuit — different location)

What ships in the box

• 1 × Short U-shaped circulating-pump molded hose (8M0071007 / 32-96879 family)
• 2 × Hose clamps

Often ordered with related cooling hoses

• V6/V8 circulating pump hose 32-87108 — GH SKU 18H1006 (not this listing)
• Bravo Design I transom water intake 32-43437 — GH SKU 18H1001 (transom, not engine bay)
• If your old hose is 32-861590A05 (with drain), do not order this SKU

Install tips in the engine bay

Cooling system work — drain as needed. If you are not comfortable opening the engine cooling circuit, use a marine shop.

1. Confirm 8M0071007 / 32-96879 / 32-47640 and the short U route from distribution block to circulating pump before removal.
2. Loosen both clamps; pull off the old hose; inspect fittings for corrosion, scale, sharp edges, or blockage.
3. Route the new short U in the same orientation — no twist, kink, or contact with belts / moving parts.
4. Seat both ends fully; place both clamps behind the sealing beads; tighten to the service-manual specification.
5. Refill / supply cooling water as required, run the engine, and check for leaks and normal temperature before returning the boat to service.

FAQ

Will this fit every 2.5L or 3.0L MerCruiser?

No. Only engines that use the distribution-block-to-circulating-pump short U route with 8M0071007 / 32-96879 / 32-47640. Confirm the original hose number, U geometry, cooling diagram, and engine serial — displacement alone does not prove fit.

Is 8M0071007 the same as 32-96879 / 32-47640?

They are in the same 2.5L/3.0L circulating-pump hose family when the diagram matches. 8M0071007 / 32-8M0071007 is the current number; 32-96879 and 32-47640 are legacy. Still compare shape to your old hose before install.

Is this the same as the Bravo transom water intake hose?

No. This is an engine-bay circulating-pump hose. Bravo Design I transom intake is 32-43437 (GH 18H1001). Alpha transom intake is a different family (e.g. 32-41725-33).

What comes in the box?

One short U-shaped molded hose plus two hose clamps. No V6/V8 hose, no drain assembly, and no transom intake hose.

I have a 4.3 / 5.0 / 5.7 — is this my hose?

Usually no. Those V6/V8 engines typically use 32-87108 / 18-71337 (or the drain assembly 32-861590A05). See GH SKU 18H1006 for the V6/V8 family.

Do I need bellows adhesive or an expander tool?

No. This is a clamped molded cooling hose in the engine bay — not a sterndrive exhaust bellow. Seat the ends, clamp behind the beads, and verify temperature / leaks.

Please note

Aftermarket replacement part. Not affiliated with engine manufacturers named above. "Compatible with", "Replaces", and cross-ref numbers mean this part is built to work like the originals listed — always confirm fit with your engine serial number, cooling diagram, and original hose number.