Volvo Penta Hose Connection 851766

Volvo Penta 851766 is a genuine hose connection used in the cooling-water hose circuit on a range of classic Volvo Penta sterndrive applications. Volvo Penta’s official parts shop lists 851766 as an active genuine part number described as a hose connection. Cross-references in current marine parts catalogs also associate this part with the later Volvo Penta numbers 854031 and 897600, commonly used for the same hose-connection application.

Key Features

• Genuine Volvo Penta part number 851766.
• Hose connection used in Volvo Penta sterndrive cooling-water hose routing.
• Common cross-reference numbers include 854031 and 897600.
• Aftermarket cross-reference commonly listed as Sierra 18-2777.
• Often supplied with a sealing gasket in replacement-kit form.

Engine Compatibility
Supportable catalog references tie this hose connection to Volvo Penta AQ and sterndrive families including AQ200, AQ250, AQ270, AQ275, AQ280, AQ280DP, AQ285A, AQ290, AQ290A, AQ290DP, SP-A, SP-A/MT, SP-A1, SP-A2, SP-C, SP-C1, DP-A, DP-A1, DP-A2, DP-B, DP-B1, DP-C, and DP-D. Broad retail references also describe it as fitting Volvo Penta Z-drive or sterndrive 200290, SP, and DP applications.

Serial Number Fitment Notice
Fitment can vary by drive version, cooling-hose arrangement, and production break. Confirm Volvo Penta 851766 against your exact engine or drive serial number before ordering. Volvo Penta’s engine identification and support tools are the right reference point for final verification.

When This Part Needs Replacement
Replace this hose connection when the original fitting is corroded, cracked, pitted, leaking, or no longer seals properly at the hose or mounting surface. It is also a smart service item when repairing nearby cooling-water components and the original connector shows age or sealing-surface wear.

Installation Notes
Inspect the connector body, hose seat, and sealing area before installation. Use the correct gasket or seal for the application, and confirm the hose path and connection style match your exact Volvo Penta drive or engine setup before tightening. Volvo Penta recommends using the correct engine identification and genuine parts support resources to match service parts accurately.

Alternate/Superseded Part Numbers
Common related or replacement references for this hose connection include Volvo Penta 854031 and 897600. In aftermarket catalogs, Sierra 18-2777 is also commonly cross-referenced.

Parts Desk Insight
This is one of those older Volvo Penta cooling-system fittings that can look simple but causes real problems when it corrodes internally or stops sealing cleanly. On older AQ, SP, and DP setups, replacing a worn hose connection during cooling-system service can help prevent repeat leaks and save time when the drive or hose routing is already apart. The main key is matching by serial number and layout, because several closely related Volvo Penta numbers are commonly grouped together in replacement catalogs.

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