Mercury MerCruiser Quicksilver — Distributor Cap & Rotor Kit GM V8 Thunderbolt IV & V — 805759T3
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Mercury MerCruiser Quicksilver Distributor Cap & Rotor Kit 805759T3
Restore strong, reliable spark on your GM V8 MerCruiser with a genuine Mercury cap and rotor kit. Part 805759T3 is built for marinized GM V8 engines with Thunderbolt IV or Thunderbolt V HEI ignition. The cap is made from a PBT/PET plastic blend for strength, stiffness and warpage resistance, and the coated brass rotor helps reduce RFI interference with onboard electronics.
Part Details
- Part number: 805759T3
- Brand: Mercury MerCruiser / Quicksilver
- Product type: Distributor cap and rotor kit
- System: Ignition, distributor
- Ignition type: Thunderbolt IV and Thunderbolt V HEI
- GTIN/UPC: 745061028890
- Condition: New, genuine OEM
Kit Contents
- 805759T1 Distributor Cap
- 13524T1 Rotor
- 27-805760 Distributor Cap Gasket
Compatible Applications
- GM-based MerCruiser V8 engines with Thunderbolt IV or V HEI ignition
- MerCruiser 5.0L and 5.7L TKS service families
- MerCruiser 5.7L Competition Ski (GM 350 V8)
Serial Number Fitment
Confirm your engine serial number and installed ignition system before ordering. MerCruiser V8 engines were built with several distributor systems, including Thunderbolt and Delco designs. 805759T3 is specifically for the Thunderbolt IV and V HEI distributor.
When to Replace
Replace the cap and rotor when the cap shows cracking, moisture intrusion, corrosion or carbon tracking, or when the rotor contacts are worn or burned. Worn ignition parts can cause hard starting, rough running and misfire.
Installation Notes
- Disconnect battery power before ignition service.
- Move spark plug wires one at a time, or mark their positions before removing the old cap.
- Inspect the distributor, ignition wires and terminals for corrosion or damage before installing the new parts.
Alternate Part Numbers
- 805759T3 — Mercury OEM kit
- 805759Q3 — Quicksilver equivalent kit
Technical FAQ
Will this fit my V8 with a Delco distributor?
No. Delco distributor systems use different cap and rotor kits. 805759T3 is for Thunderbolt IV and V HEI ignition only.
Is 805759Q3 the same kit?
Yes, 805759Q3 is the Quicksilver equivalent of this kit.
Related Parts
- Mercury MerCruiser Quicksilver V8 Distributor Cap 805759T1
- MerCruiser Distributor Cap & Rotor Kit 805759Q3
- Mercury Ignition Coil Kit 8M0079202, Thunderbolt IV & V
Parts Desk Insights
Best use case: Routine tune-ups on GM V8 MerCruiser engines with Thunderbolt IV or V HEI ignition, or fixing hard starting and misfire caused by a worn cap or rotor.
Most common mistake: Ordering by V8 displacement alone. Delco-equipped V8s look similar but use a different kit.
Sizing and fitment: If you are unsure which ignition you have, check the distributor and confirm with your engine serial number 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.