875815 Zinc Ring Kit | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta anodes are made to sacrifice themselves in order to protect the drive and propeller from galvanic corrosion. Volvo Penta now recommends aluminium anodes in salt and brackish water instead of the zinc previously recommended for salt water, and is gradually phasing out and replacing most of its zinc anodes with aluminium ones. Aluminium anodes give 30% higher corrosion protection capacity, up to 20-40% longer life span in salt water compared with similarly sized zinc anodes, a lower environmental impact, and are the better choice for brackish water too. Magnesium is the material listed for fresh water. This is the cadmium-free zinc anode listed for lower gear, 200-290, SP drives, supplied for salt and brackish water. For some older drives Volvo Penta still provides cadmium-free zinc anodes, marked Zn, for salt and brackish water instead of aluminium anodes.

🚤 Compatibility

• Engine Family: MD, TMD, AQ, AD, AQAD, D, BB, TAMD, MS, B, DP, SP, AQD

Full model list at the end of this description.

⚙️ Key Features

• Lower gear anode for the single prop 200-290 and SP drives
• Cadmium-free zinc, for salt and brackish water on these older drives
• 0.885 kg
• Supersedes 839388
• Fresh water equivalent is magnesium anode 876137
• Cadmium-free zinc anode for Lower gear, 200-290, SP drives.
• Listed for salt and brackish water.
• Aluminium anodes give 30% higher corrosion protection capacity than a similarly sized zinc anode.
• Up to 20-40% longer life span in salt water than a similarly sized zinc anode.
• Lower environmental impact, and the better choice for brackish water as well as salt.
• Aluminium anodes can be used for all types of hull material.
• Volvo Penta anodes feature, where needed, an internal reinforcement made from an alloy that does not erode, which also ensures a reliable electrical connection between the anode and the drive.
• Material: cadmium-free zinc
• Fits: Lower gear, 200-290, SP drives
• Cadmium-free zinc sacrificial anode for the lower gear position
• Fits the Aquamatic single prop 200-290 and SP drives
• Position: lower gear
• Water type: Salt and brackish water
• Fits: the Aquamatic single prop 200-290 and SP drives

🔌 Function

Corrodes in place of the drive's aluminium castings, giving the galvanic current a sacrificial path so the housings, gears and fasteners are left alone.

⚠️ Common Signs of Failure

• Anode eaten away to less than half its original size
• White or grey paint-like blooming on the drive castings near the anode
• Anode still bright and untouched after a season, meaning it is not making electrical contact
• Pitting or flaking on the gear housing itself
• Mounting screws seized or wasted so the anode is loose

🛠️ Service Notes

• Never paint or prime an anode, and clean the seat back to bare metal so the earth path is sound
• If the boat lies in fresh water, fit magnesium anode 876137 instead
• Volvo Penta now recommends aluminium for salt and brackish water and is phasing most zinc anodes out, but zinc remains the listed material for this older drive
• Salt and brackish water: aluminium (or, on some older drives, cadmium-free zinc marked Zn). Fresh water: magnesium.
• When installing a new anode it is important to have good contact between the anode and the surface to which it is connected.
• If an anode has been exposed to air for a long time it can be covered by a passivating surface film that prevents it working properly; consider reactivating it with emery paper before launching. Do not use sandpaper, a wire brush or other steel tools when cleaning, as these may damage the galvanic protection.
• Water flow, salinity, temperature, pollution levels and stray current considerably affect anode life.
• Read the operator's manual for detailed information on maintaining and replacing anodes.
• Aluminium anodes are listed as giving 30% higher corrosion protection capacity and up to 20-40% longer life in salt water than similarly sized zinc anodes, with lower environmental impact, and as the better choice for brackish water too
• Magnesium is the material listed for fresh water
• For some older drives, cadmium-free zinc anodes, marked Zn, are supplied for salt and brackish water instead of aluminium
• Volvo Penta anodes carry, where needed, an internal reinforcement in an alloy that does not erode, which also keeps a reliable electrical connection between the anode and the drive
• An anode that has been exposed to air for a long time can be covered by a passivating surface film that stops it working properly; consider reactivating it with emery paper before launching the boat
• Refer to the Operator's Manual for maintenance and replacement detail for your own product

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 875815 → Supersedes 839388

OEM / Related Numbers

• 839388 earlier number superseded by this part

Aftermarket / Verified Equivalents

• Orbitrade: 19815
• Orbitrade: 19815-1

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta 740B, 500A, 501A, 501B, 570A, 572A, 430A, 430B, 431A, 431B, 432A, 434A, 230A, 230B, 231LB, 250A, 250B, 251A, 271LB, 275A, 280B, 285A, 290DP, 570, 500B, 500, 571A, 430
• Volvo Penta DP-C, DP-C1, DP-D, DP-D1, DP-A, DP-A2
• Volvo Penta SP-C, SP-E, SP-A2, SP-C1, SP-A, SP-A1
• Volvo Penta AD31, AD31B, AD31D, AD31D-A, AD31XD
• Volvo Penta B230, B230E, B230F, B230FB, B230FX
• Volvo Penta AQ131A, AQ131B, AQ131C, AQ131D
• Volvo Penta AQ271A, AQ271C, AQ271B, AQ271D
• Volvo Penta BB225A, BB225AV, BB225B, BB225C
• Volvo Penta TAMD31M, TAMD31A, TAMD31B, TAMD31D
• Volvo Penta AQ151A, AQ151B, AQ151C
• Volvo Penta AQ225D, AQ225E, AQ225F
• Volvo Penta BB260AV, BB260B, BB260C
• Volvo Penta TMD31A, TMD31B, TMD31D
• Volvo Penta TMD40A, TMD40B, TMD40C
• Volvo Penta AD41B, AD41BJ
• Volvo Penta AQ145B, AQ145A
• Volvo Penta AQ171A, AQ171C
• Volvo Penta AQ200D, AQ200F
• Volvo Penta AQ205LB, AQ205A
• Volvo Penta AQ231A, AQ231B
• Volvo Penta AQ260A, AQ260B
• Volvo Penta AQ311A, AQ311B
• Volvo Penta AQAD40B, AQAD40A
• Volvo Penta MS3B, MS3C
• Volvo Penta MS4B, MS4A
• Volvo Penta TAMD40A, TAMD40B
• Volvo Penta AD30A
• Volvo Penta AD40B
• Volvo Penta AQ120B
• Volvo Penta AQ125A
• Volvo Penta AQ140A
• Volvo Penta AQ175A
• Volvo Penta AQ190A
• Volvo Penta AQ211A
• Volvo Penta AQ240A
• Volvo Penta AQ290A
• Volvo Penta AQAD30A
• Volvo Penta AQD21B
• Volvo Penta AQD40A
• Volvo Penta BB140A
• Volvo Penta BB145A
• Volvo Penta D41B
• Volvo Penta MD21B
• Volvo Penta MD30A
• Volvo Penta MD31A
• Volvo Penta MD40A
• Volvo Penta TAMD30A
• Volvo Penta TAMD41B
• Volvo Penta TMD30A
• Volvo Penta TMD41B