Volvo Penta Washer 11978 | OEM Hardware for D4 D6 TAMD AD Series
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Volvo Penta Washer — Part #11978
A genuine OEM washer used across a wide range of Volvo Penta diesel engine and drive applications. This is an individual service part — not a kit item — commonly replaced during engine and drive disassembly when the original washer is deformed, corroded, or should not be reused.
Part Details
- Part Number: 11978
- Brand: Volvo Penta OEM
- Official Product Type: Washer
- System: Multiple engine and drive assembly locations (verify by diagram)
- Weight: Approx. 0.005–0.006 kg (small individual hardware part)
- Sold: Individually
Compatible Applications
- Volvo Penta AD31
- Volvo Penta AD41
- Volvo Penta AQAD30A
- Volvo Penta D4-180I, D4-225A/I, D4-260A/D, D4-300A/D
- Volvo Penta 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
- Volvo Penta TAMD61A, TAMD62A, TAMD71A/B, TAMD72A/P-A/WJ-A
- Volvo Penta TMD102A, DH10A
- Volvo Penta TAD1030V/VE, TD1010G, TD1030VE, TD30A
- Volvo Penta TWD1010G, TWD1030ME, TWD1031VE
- Always confirm fitment by engine serial number and diagram position before ordering — washer inside diameter, outside diameter, and thickness vary between assembly locations even within the same engine family
What This Part Does
Washers distribute clamping load across a larger surface area, protect mating surfaces from fastener damage, and in some locations provide a sealing or spacing function. Because this washer is used across multiple engine families and assembly locations, the exact function depends on where it is installed in your specific engine. Replacing it with the correct OEM part ensures the right dimensions and material for that location.
Service Interval
Replace any time the washer is deformed, corroded, cracked, or no longer flat. In assemblies where the washer provides a sealing function, replace it as a matter of course during any disassembly — reusing a compressed or deformed washer risks leakage or incorrect clamp load on reassembly.
Technical FAQ
Q: How do I confirm this is the correct washer for my engine?
A: Cross-reference part number 11978 against the Volvo Penta parts diagram for your specific engine model and serial number. Match the diagram position and compare the dimensions of the original washer before ordering.
Q: Can I substitute a generic washer of the same size?
A: For non-critical locations, a hardware-grade washer of the correct dimensions may be acceptable. However, in sealing or high-load locations, OEM material specification matters. When in doubt, use the genuine Volvo Penta part.
Q: Is 11978 still an active part number?
A: Yes — 11978 is the current active Volvo Penta part number for this washer. No confirmed superseded number has been identified.
Parts Desk Insights
Best use case: This washer is most commonly ordered as part of a broader engine or drive service where the original hardware is being replaced as a matter of good practice. Because it appears across so many Volvo Penta engine families, it’s a useful stock item for shops that regularly service D4, D6, TAMD, and AD-series engines.
Common issues we see: The most frequent question is whether 11978 is the right washer for a specific location. Because this part number appears in many different diagram positions across multiple engine families, the safest approach is to confirm by diagram position and measure the original washer before ordering. Ordering by part number alone without checking the diagram location can result in receiving the correct part for the wrong position.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.