Mercury / Quicksilver 808483K1 Distributor Cap & Rotor Kit | MerCruiser GM V8 Delco HEI | 1997 & Older
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Part Details
- Part Number: 808483K1
- Brand: Mercury Marine / Quicksilver (Genuine OEM)
- Official Product Type: Distributor Cap & Rotor Kit
- Ignition System: Delco HEI — GM-based MerCruiser V8
- Application Range: 1997 model year and older
- Cap Construction: PBT/PET plastic — for strength, stiffness, and resistance to warpage
- Terminals: Solid brass — corrosion-resistant
- Kit Includes: Distributor cap and rotor
- Supersedes: 808483T1, 808483Q1
- Sierra Aftermarket Cross-Reference: 18-5281
- GTIN / UPC: 745061043305
- Weight (approx.): 300 g
What This Kit Is
Mercury / Quicksilver 808483K1 is a genuine OEM distributor cap and rotor kit for 1997-and-older GM-based MerCruiser V8 engines equipped with the Delco HEI ignition system. The kit provides both service components needed for a distributor tune-up in a single part number. The cap uses a PBT/PET plastic housing with solid brass terminals for long-term corrosion and electrical resistance in a marine environment.
Important fitment note: This kit is specific to the Delco HEI distributor configuration used on older GM V8 MerCruiser engines. It is not interchangeable with Thunderbolt IV/V distributors, later flat-cap Vortec configurations, or V6 applications — those use different caps and rotors. Engine displacement alone is not sufficient to confirm fitment; the distributor type must be verified.
Compatible Applications
Fitment must be confirmed by engine model, serial number, and installed distributor type. Documented applications include:
- MerCruiser 5.0L V8 — GM-based, Delco HEI ignition, 1997 and older
- MerCruiser 5.7L / 350 CID V8 — GM-based, Delco HEI ignition, 1997 and older
- MerCruiser 7.4L / 454 CID V8 — GM-based, Delco HEI ignition, 1997 and older
- MerCruiser 8.2L V8 — GM-based, Delco HEI ignition, 1997 and older
- Other GM-based MerCruiser V8 applications where the Delco HEI distributor is factory-installed and the parts diagram calls for 808483K1
Always verify the installed distributor type against the engine serial number before ordering. Do not use this kit with Thunderbolt IV, Thunderbolt V, or later Vortec flat-cap distributors.
Kit Contents
- Distributor cap — PBT/PET plastic housing with solid brass terminals
- Rotor
When to Replace
Replace the distributor cap and rotor if inspection shows any of the following:
- Carbon tracking inside the cap
- Corroded, burned, or pitted cap terminals
- Cracked or damaged cap housing
- Moisture or corrosion inside the distributor
- Burned, worn, or loose rotor tip
- Hard starting or failure to start
- Intermittent or persistent ignition misfire
- Rough running under load that cannot be traced to fuel or timing
The cap and rotor are wear items inspected during routine ignition tune-up service. Even without visible damage, replacing them on a scheduled basis is good practice on marine engines that see seasonal use.
Service Interval
Inspect the distributor cap and rotor annually or at every major tune-up service. Mercury service guidelines for older carbureted and early fuel-injected engines generally recommend ignition component inspection at regular seasonal service. Replace at the first sign of carbon tracking, terminal corrosion, or rotor wear — do not defer if any of those conditions are found.
Installation Notes
- Disconnect battery power before servicing the ignition system
- Mark or photograph spark-plug wire positions on the old cap before removing it
- Transfer plug wires one at a time to maintain correct firing order
- Inspect spark-plug wires for cracking, corrosion at the terminals, or resistance out of specification — see Engine Electrical for wire sets
- Inspect the distributor interior for moisture, corrosion, or debris
- Ensure the new rotor is fully seated on the distributor shaft before fitting the cap
- Seat the cap evenly and secure all retaining clips or screws before restoring battery power
- Verify the engine starts and runs cleanly; check for misfire under load
Technical FAQ
How do I know if my MerCruiser uses a Delco HEI distributor vs. a Thunderbolt?
The Delco HEI cap on older GM V8 MerCruiser engines is typically a large round cap with external plug wire terminals around the perimeter and a central coil tower. Thunderbolt IV/V distributors use a different cap profile. The most reliable check is to verify the distributor cap part number in the ignition diagram for your engine serial number. If 808483K1 appears in the diagram, your engine uses the Delco configuration.
Does this kit include spark-plug wires?
No. 808483K1 includes the distributor cap and rotor only. Spark-plug wire sets are sold separately. Browse Engine Electrical for available wire sets for MerCruiser applications.
What superseded part numbers does 808483K1 replace?
808483K1 supersedes earlier Mercury references 808483T1 and 808483Q1. The base family reference is 808483. Always order by the current number 808483K1.
What aftermarket part crosses to 808483K1?
Sierra 18-5281 is the documented aftermarket equivalent. Verify the cross-reference against your engine’s ignition diagram before substituting.
Can I use this kit on a 4.3L V6 MerCruiser?
No. Mercury specifically identifies 808483K1 for GM V8 Delco HEI applications. The 4.3L V6 and other engine families use different distributor cap and rotor configurations.
Superseded / Cross-Reference Part Numbers
- Current Mercury OEM: 808483K1
- Earlier Mercury references: 808483T1, 808483Q1, 808483
- Sierra aftermarket: 18-5281
- GTIN / UPC: 745061043305
Related Parts
- Spark-plug wire sets for MerCruiser Thunderbolt applications — Sierra 47-88021, Sierra 47-88032, Sierra 47-88041 and others in Engine Electrical
- Browse Ignition Components for all distributor caps, rotors, and tune-up parts
- Browse MerCruiser Marine Engine Parts
Parts Desk Insights
Best use case: 808483K1 is the correct routine tune-up kit for older GM V8 MerCruiser engines running the Delco HEI ignition — most commonly seen on 1990s-era 5.0L, 5.7L, 7.4L, and 8.2L engines. It’s a straightforward seasonal service item for boats that have been in storage or are due for ignition maintenance before the season.
Common issue: The most frequent mistake is ordering this kit for a MerCruiser V8 without first confirming the distributor type. Thunderbolt IV and Thunderbolt V distributors — also common on similar V8 engines from the same era — use a completely different cap and rotor that does not interchange with 808483K1. Always verify the distributor style from the engine serial number and parts diagram before ordering.
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.