Mercury Distributor Cap & Rotor Kit – 811635Q2
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Mercury MerCruiser Quicksilver 811635Q2 is a genuine OEM distributor cap and rotor kit for marinized General Motors 4-cylinder MerCruiser engines using Delco EST ignition systems. Mercury’s current product information states that this kit includes both the distributor cap and rotor and is intended for select 4-cylinder GM-based applications.
Key Features
- Genuine Mercury MerCruiser Quicksilver OEM kit
- Distributor cap and rotor included
- For GM-based 4-cylinder marine engines with Delco EST ignition
- Distributor cap is described by Mercury/Quicksilver sources as using a PBT/PET plastic blend for strength, stiffness, and warpage resistance
- Solid brass inserts are used for corrosion resistance and long service life
- Rotor is described as high strength-to-weight for durability and resistance to thermal cracking.
Engine Compatibility
Fits marinized General Motors 4-cylinder MerCruiser engines with Delco EST (Electronic Spark Timing) ignition systems. Public cross-reference listings also commonly describe this kit on 3.0L Delco EST inline 4-cylinder marine applications, but fitment should still be confirmed by engine model, serial number, and distributor setup before ordering.
Serial Number Fitment Notice
Fitment should be confirmed by MerCruiser engine serial number and ignition system configuration, not by engine family alone. Mercury’s own parts resources direct owners to use the owner’s manual and parts catalog for exact replacement confirmation.
When This Part Needs Replacement
Replace when the distributor cap shows carbon tracking, terminal corrosion, cracking, or moisture intrusion, or when the rotor shows burning, wear, looseness, or inconsistent spark transfer. Cap-and-rotor wear can lead to hard starting, rough running, and ignition misfire. This maintenance need is an inference from the part’s role as an ignition tune-up component and the OEM replacement positioning.
Installation Notes
Install only on the correct Delco EST 4-cylinder distributor application. Confirm the replacement matches the removed cap and rotor before installation. Mercury also lists 811635T3 as the matching cap-only service part for the same ignition family, which is a useful cross-check when verifying the distributor setup.
Alternate / Superseded Part Numbers
- 811635Q2
- Public replacement listings also associate this application with earlier/interchange references including 811635Q1 and 811635T2
- Common aftermarket cross references listed publicly include Volvo Penta 3854260 / 3854261 and OMC 986643 / 986651 for equivalent application families.
Parts Desk Insight
The key match point on 811635Q2 is the ignition family first: GM 4-cylinder with Delco EST. That is the quickest way to separate it from MerCruiser V6/V8 Thunderbolt or HEI cap-and-rotor kits that can look similar but do not interchange.
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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.