Volvo Penta Spark Plug Kit 21513423 | OEM Gasoline Engine Ignition Kit
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Volvo Penta Spark Plug Kit — Part #21513423
This is the genuine OEM spark plug kit for Volvo Penta 4.3L and 5.0L GXi/OSi gasoline marine engines. The complete kit includes the full set of pre-gapped plugs to the factory specification, making it the straightforward choice for scheduled tune-ups or ignition system restoration. Designed for a direct fit with no modification required.
Part Details
- Part Number: 21513423
- Brand: Volvo Penta
- Official Product Type: Spark Plug Kit
- System: Ignition
- Condition: New OEM
Kit Contents
- Complete set of OEM spark plugs (quantity matches engine cylinder count)
- Pre-gapped to factory specification — ready to install
Compatible Applications
- Volvo Penta 4.3L GXi, 4.3L OSi gasoline marine engines
- Volvo Penta 5.0L GXi, 5.0L OSi gasoline marine engines
- Compatibility is serial-number dependent — verify against your engine serial number and parts diagram before ordering
Technical Specifications
- Fitment: Direct OEM replacement — no modification required
- Gap: Pre-set to factory specification
- Heat Range: Optimized for marine gasoline applications
- Estimated Weight: Approx. 0.3 kg (full kit)
Parts Desk Insights
Best Use Case: This kit is the right choice for annual tune-ups on 4.3L and 5.0L Volvo Penta gasoline engines, or any time you're chasing a rough idle, hard start, or noticeable drop in fuel economy. It's one of the highest-value maintenance items on these engines — fresh plugs often make a dramatic difference in throttle response and idle quality.
Common Issues: Customers frequently contact us after noticing a rough idle or misfires that appeared gradually over a season. Fouled or worn plugs are a common culprit on engines that see a lot of low-speed trolling or short run cycles. If you're replacing plugs due to fouling, it's worth inspecting the ignition cables at the same time — deteriorated cables are often found alongside worn plugs on higher-hour engines.
Service Interval
Volvo Penta recommends replacing spark plugs every 100–200 hours or annually, whichever comes first. Replace sooner if you notice rough idle, misfires, hard starting, or increased fuel consumption. Always refer to your engine's service manual for the exact interval for your model and serial number range.
Technical FAQ
Q: Are the plugs pre-gapped in this kit?
A: Yes — OEM Volvo Penta spark plug kits are pre-gapped to factory specification. Verify the gap before installation as a best practice.
Q: Can I use aftermarket plugs instead?
A: Aftermarket equivalents exist (such as Champion RV12YC or NGK BPR6EFS), but OEM plugs are spec'd to the exact heat range and thread reach for your engine. We carry both — contact us if you'd like to compare options.
Q: How do I know how many plugs are in the kit?
A: The kit is sized for your engine's cylinder count. A 4.3L V6 takes 6 plugs; a 5.0L V8 takes 8. Confirm your engine model when ordering if you're unsure.
Related Parts
- Volvo Penta 8.1L V8 Spark Plug Kit 3861327 — OEM plug kit for larger V8 engines
- Volvo Penta 8.1L V8 Ignition Cable Kit 3861295 — replace cables alongside plugs
- Volvo Penta Ignition Cable Kit 3888328 — ignition wire set, commonly replaced at same interval
- Champion RV12YC Spark Plug #406 4-Pack — aftermarket equivalent option
- NGK Spark Plug BPR6EFS 3523 — aftermarket alternative
- Sierra Marine Distributor Cap 18-5362 — related ignition system component
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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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.
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