Description

Volvo Penta 11978 is a genuine OEM washer used across a wide range of Volvo Penta engine and drive applications. Current references identify it simply as a washer, and current fitment references show it used on both older diesel platforms such as AD31, AD41, AQAD30A, TAMD61A/TAMD62A/TAMD71A/TAMD72A families and newer D4/D6 applications. Current seller references also present it as a small plain washer/ring style service part rather than a kit item.

Key Features

• Genuine Volvo Penta OEM part number 11978.
• Current reviewed sources identify it as a washer / plain washer.
• Small individual service part, sold separately rather than in a kit.
• Lightweight hardware item, with current retail references commonly showing weight around 0.005–0.006 kg.

Engine Compatibility
Current reviewed public references show broad fitment coverage for Volvo Penta 11978. The strongest public fitment list currently available in the reviewed sources includes AD31, AD41, AQAD30A, D4-180I, D4-225A/I, D4-260A/D, D4-300A/D, D6-280A/I, D6-300A/D/I, D6-310A/D/I, D6-330A/D/I, D6-350A, D6-370A/D/I, D6-380A, D6-400A, D6-435D/I, TAMD61A, TAMD62A, TAMD71A/B, TAMD72A/P-A/WJ-A, TMD102A, DH10A, TAD1030V/VE, TD1010G, TD1030VE, TD30A, TWD1010G, TWD1030ME, and TWD1031VE. Because this is a general hardware washer used in multiple systems, final fitment should still be confirmed by exact engine serial number and diagram position before ordering.

Serial Number Fitment Notice
Washers can vary by inside diameter, outside diameter, thickness, and the exact assembly where they are used. Confirm Volvo Penta 11978 by engine or drive serial number and by matching the original washer dimensions and schematic location before ordering. Current Volvo Penta and dealer references continue to list 11978 as an active genuine washer part number.

When This Part Needs Replacement
Replace this washer when the original is deformed, worn, corroded, damaged during disassembly, or no longer suitable for correct clamp load or sealing support in the assembly being serviced. Because this is a small individual hardware part used across multiple systems, replacement is most commonly tied to related service work where the original washer shows wear or should not be reused. This is service-based guidance grounded in the part’s confirmed role as an OEM washer.

Installation Notes
Match the replacement directly to the original washer before installation and confirm the correct position in the parts diagram for the engine or drive being serviced. Since current public references confirm the part number more clearly than the exact installed location, direct comparison to the removed washer and serial-number verification are the safest checkpoints before final assembly.

Alternate/Superseded Part Numbers
Current reviewed sources clearly identify 11978 as the active Volvo Penta number for this washer. No confirmed Volvo Penta superseded number is clearly shown in the reviewed references.

Parts Desk Insight
For small hardware items like 11978, the best buying checkpoint is the exact diagram position and washer dimensions, not the word “washer” alone. Current references show very broad application coverage, which usually means this part is easy to overlook but important to match correctly by size and location. Serial-number confirmation is the cleanest way to avoid ordering the wrong small hardware piece.

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