Tune Up Kit Mallory V8 Flat Cap | Sierra 18-5272

Sierra 18-5272 Mallory V8 Flat Cap Tune-Up Kit | Distributor Cap, Rotor, Points & Condenser | Single-Point

The Sierra #18-5272 is a complete tune-up kit for Mallory V8 flat cap, side-terminal, single-point marine distributors. Includes distributor cap, rotor, contact point set, and condenser — all four components for a complete conventional ignition service. Replaces Mallory 9-29312.

Part Details:

• Part Number: 18-5272 (Sierra)
• SKU: SIERRA-18-5272
• Manufacturer: Sierra
• Type: Tune-Up Kit — Conventional Ignition (Single-Point)
• Distributor Compatibility: Mallory V8 flat cap, side-terminal, single-point distributors
• Kit Contents: Distributor cap, rotor, contact point set, condenser
• Replaces: Mallory 9-29312
• Condition: New

Cross-Reference — Replaces:

• Mallory: 9-29312

Additional Information

What’s in the Kit — Complete Conventional Ignition Service:

The Sierra 18-5272 includes all four components required to fully service a Mallory single-point marine distributor:

• Distributor cap — high-dielectric strength marine cap; side-terminal (flat cap / crab-style) configuration with non-vented design for fuel vapor safety in enclosed engine compartments
• Rotor — precision-balanced replacement rotor for the Mallory V8 flat cap distributor
• Contact point set — replacement points for the Mallory single-point ignition; designed to resist pitting and burning under marine high-heat operating conditions
• Condenser — heavy-duty replacement condenser matched to the points set

Replace all four components together at every tune-up — do not mix new and used components within the same ignition service.

Mallory Flat Cap Distributor — Identification:

The Mallory V8 flat cap (also called “crab style”) distributor is a low-profile, side-terminal distributor where the spark plug wires exit from the sides of the cap rather than the top. The flat cap design is compact and commonly found in tight V8 marine engine compartments where a tall, tower-style cap would not fit. To confirm your distributor is a Mallory V8 flat cap single-point unit:

• Spark plug wires exit from the sides of the cap, not the top — this is the defining characteristic of the flat/crab cap style
• The cap is low-profile compared to standard marine distributor caps
• The distributor has a single point set inside (not electronic — look for contact points on the breaker plate)
• Cross-reference the existing cap or points part number against Mallory 9-29312

Single-Point (Conventional) Ignition — Not Electronic:

The Sierra 18-5272 is for single-point (conventional) ignition distributors only — the type using contact points, a condenser, and a mechanical breaker plate. Mallory also produced electronic ignition distributors; the 18-5272 does not apply to electronic ignition systems. If your distributor has been converted to electronic ignition, this kit is not the correct service kit.

Marine-Grade vs. Automotive Parts:

Marine distributor caps must be non-vented — automotive caps are vented to release ozone, but vented caps in an enclosed marine engine compartment can allow fuel vapor to enter the ignition system, creating a fire hazard. The Sierra 18-5272 uses a non-vented marine cap per ABYC requirements. Do not substitute automotive tune-up parts in marine applications.

Tune-Up Service Interval:

For conventional ignition systems, Sierra recommends annual tune-up service or every 100 hours, whichever comes first. Always replace cap, rotor, points, and condenser together at the same service — worn points will accelerate wear on a new cap, and a marginal condenser will shorten point life. Inspect point gap and set to specification per the engine’s service manual after installing new points.

Installation Notes:

• Confirm distributor is Mallory V8 flat cap, side-terminal, single-point before ordering
• Replace all four kit components at the same service — do not reuse any original components
• Set point gap to specification per the engine manufacturer’s service manual after installing new points
• Use marine-rated dielectric grease on cap terminal contacts
• Check ignition timing after tune-up and adjust to specification

Frequently Asked Questions

1. How do I confirm I have a Mallory flat cap single-point distributor?
Look at where the spark plug wires connect to the distributor cap. If the wires exit from the sides of a low-profile cap rather than the top, you have a flat cap (crab-style) distributor. Open the cap and confirm a single set of contact points on a breaker plate — this confirms single-point (conventional) ignition. Cross-reference your existing cap or points part number against Mallory 9-29312 to confirm the Sierra 18-5272 is correct.

2. What does this kit include?
Distributor cap, rotor, contact point set, and condenser — everything needed for a complete conventional ignition tune-up on the Mallory V8 flat cap single-point distributor.

3. Will this kit fit a Mallory electronic ignition distributor?
No — the 18-5272 is for single-point (conventional) ignition distributors only. Electronic ignition distributors do not use points or condensers and require different service components.

4. Can I use automotive tune-up parts instead?
No — marine distributor caps must be non-vented. Automotive caps are vented and are a fire hazard in enclosed marine engine compartments. Always use marine-rated ignition components.

5. How often should I replace points and condenser on a conventional ignition?
Annually or every 100 hours, whichever comes first. Replace all four components — cap, rotor, points, condenser — at the same service. Set point gap to specification per your engine’s service manual after installation and verify ignition timing.