Sierra Ignition Rotor AP-3065 SIE-18-5408
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Sierra SIE-18-5408 is an ignition rotor identified as AP-3065 for GM V6 marine engines using the newer Delco EST / HEI module-in-cap distributor setup. It is used in MerCruiser, OMC, and Volvo Penta stern drive applications that use this distributor style, and it is commonly paired with Sierra distributor cap 18-5362.
Key Features
- Ignition rotor
- Sierra part number: 18-5408
- AP-3065 application reference
- Fits new GM-style module-in-cap distributors
- For 4.3L V6 engines with Delco HEI / EST ignition
- Commonly used with Sierra distributor cap 18-5362
- Brass contact terminal construction is listed by current sellers.
Engine Compatibility
Commonly listed for GM 4.3L V6 marine engines using Delco HEI / EST module-in-cap distributors in MerCruiser, OMC stern drive, Volvo Penta, and some Crusader applications. Because ignition parts are distributor-specific, fitment should be confirmed by engine model, distributor type, and cap/rotor setup before ordering.
Serial Number Fitment Notice
Fitment should be confirmed by engine model and serial number, along with the installed Delco module-in-cap distributor configuration, before ordering. Matching the original rotor and distributor cap setup is the safest way to avoid ordering the wrong ignition part.
When This Part Needs Replacement
Replace when the rotor shows burning, carbon tracking, corrosion, cracking, looseness, or visible tip wear, or when distributor service reveals weak or inconsistent spark transfer. Rotor condition directly affects ignition performance and spark delivery.
Installation Notes
Install only on the correct Delco EST / HEI module-in-cap distributor application. Confirm the replacement matches the removed rotor exactly before installation, and inspect the distributor cap at the same time. Current sources consistently note this rotor is used with Sierra cap 18-5362.
Alternate / Superseded Part Numbers
- AP-3065
- 18-5408
- Mercury MerCruiser 804424
- Mercury MerCruiser 850485
- Mercury MerCruiser 850485-1
- Mercury MerCruiser 898253012
- Mercury MerCruiser 8M0062084
- OMC 3854311
- Volvo Penta 3854311 / 3854311-2
- Mallory 9-29221
- GLM 71110
- CDI E65-0014
Parts Desk Insight
The key match point on SIE-18-5408 is the distributor style, not just the engine family. This rotor is consistently tied to the newer GM V6 module-in-cap Delco setup, so confirming that the engine uses the 18-5362 cap style is the quickest way to avoid mixing it up with other V6 marine rotors.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
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
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.