834751 Upper Exhaust Hose · Fits Volvo Penta AQ V6/V8 select exhaust assemblies, Replaces REC834751, 89227

834751 Upper Exhaust Hose · Fits Volvo Penta AQ V6/V8 select exhaust assemblies, Replaces REC834751, 89227

GHMarine upper exhaust hose for select Volvo Penta AQ V6/V8 exhaust assemblies that specify 834751. It is a straight rubber coupler (catalog about 3-3/4 × 3-3/4 inch, ~160 mm) — not a convoluted bellow, flapper, or seawater intake hose.

Cross-refs verified for this page: REC834751, 89227. Service number 855388 applies only when your official supersession chain lists it — do not assume every AQ V8 uses it. Ships as one hose; clamps are not locked on this page.

Which hose is this?

It is the upper exhaust hose / coupler on select Volvo Penta AQ exhaust layouts that call for 834751. Buyers match the old hose number and the exhaust assembly — not a Cobra / Alpha / Bravo badge.

It is not an OMC Cobra primary listing, not drive exhaust bellows with flapper (875828 / 876633), not AQ seawater intake 875822 (GH 18H1002), and not a MerCruiser external tip flapper.

Signs yours is due

• The straight upper exhaust coupler on an AQ V6/V8 package is cracked, soft, heat-glazed, or oil-soaked — stamped 834751 / 89227 when readable.
• Black soot or heat blistering at the upper exhaust hose joints (not a through-transom tip flapper and not a U-joint bellow).
• Hose ends ovalized under the clamps and start to weep after heat cycles.
• Divert: old part is 875828 / 876633 bellow-with-flapper → those SKUs. Seawater intake 875822 → GH 18H1002. Folder names saying Cobra do not change this Volvo 834751 identity.

Will it fit my drive?

This upper exhaust hose is Compatible with select Volvo Penta AQ V6 / V8 exhaust assemblies whose EPC / parts record specifies 834751. Representative catalog context includes some AQ175 / AQ205 / AQ430–434 family V6 and select AQ/BB V8 packages (often 1993 & earlier in catalog tables). GM 305/350 displacement or horsepower alone does not prove fit.

*Representative catalog context. Final fit = OEM 834751 on the old hose or exhaust assembly EPC — not "AQ V8" or CID alone.

OEM & swap numbers

Primary OEM 834751. Verified cross-refs on this page: REC834751, 89227. 855388 only when your official supersession chain says so.

Wrong part? Read before you order

• NOT drive exhaust bellows with flapper 875828 / 876633
• NOT AQ seawater intake hose 875822 (GH 18H1002)
• NOT SX/DP-S water inlet 3852352 (GH 18H1005)
• NOT engine pump-to-thermostat hose 3852288 (GH 19H1003)
• NOT a MerCruiser / Alpha / Bravo primary fitment page
• NOT an OMC Cobra-branded identity — folder name is historical only

What ships in the box

• 1 × Upper exhaust hose / straight coupler (834751 family)
• Clamps: not locked as a fixed outbound BOM — adjacent clamp numbers (e.g. 834718) are not proof they ship in this box

Often ordered with related SKUs

• AQ200–280 seawater molded hose → GH 18H1002
• Engine water pump to thermostat hose → GH 19H1003
• Drive bellows with flapper families → GH 19B5001 / 25B1095 (confirm identity separately)

Install tips on the upper exhaust hose

Engine / exhaust-hose coupler work. Cold engine; disconnect battery; follow the Volvo Penta exhaust service method for your assembly. This is a straight rubber hose — not a sterndrive bellow. Do not use bellows adhesive or a bellows expander.

1. Confirm the old hose is 834751 (or a verified cross on this page) in the upper exhaust position.
2. Support the joint; loosen clamps; remove the old hose; clean mating tubes and check for corrosion or sharp edges.
3. Slide the new straight hose fully onto both ends without twist; place clamps on the clamp lands if your package includes them.
4. Tighten to the service-manual specification for that assembly (no universal torque invented on this page).
5. Run and check for exhaust leaks / heat soak issues before returning the boat to service.

FAQ

Is this an OMC Cobra hose?

No. 19B1001 is sold as Volvo Penta OEM 834751 upper exhaust hose. Historical folder names may say Cobra — that is not the buyer identity.

Is this a bellow or flapper?

No. It is a straight upper exhaust rubber hose / coupler. Bellows-with-flapper parts such as 875828 / 876633 are different SKUs.

Will any AQ V8 exhaust hose fit?

No. Confirm 834751 on the old hose or EPC. Displacement (305/350) or horsepower alone is not enough.

Can I order by 18-2766 or 9-42700?

Not from this page. Those numbers are not treated as verified cross-refs here. Match 834751 / REC834751 / 89227 (and 855388 only if your supersession chain lists it).

Are clamps included?

This page locks only the hose. Clamp count is not a fixed outbound BOM — check your package.

Do I need bellows adhesive or an expander?

No. Use the clamp method for this straight exhaust hose. Do not copy adhesive / expander steps from a bellow listing.

Please note

Aftermarket replacement by GHMarine. Not affiliated with engine manufacturers named above. "Compatible with", "Replaces", and cross-ref numbers identify the 834751 upper exhaust hose family — always confirm EPC / old hose number and package contents before ordering.