Sierra 18-5140 Contact Set for Mercury/Mariner Outboard Motors, 3.9-9.8 HP

The Sierra 18-5140 Contact Set is a replacement ignition contact set for Mercury and Mariner outboard motors, built to meet or exceed the quality of the original equipment part it replaces. It is designed as part of a routine ignition tune-up, working alongside the correct condenser to keep the points-type ignition system firing reliably. The contact set is constructed of aluminum and stainless steel components for durability in a marine ignition environment.

This contact set is fit specific and applies to a range of Mercury/Mariner outboard horsepower ratings across specific engine serial number ranges, including 3.9 HP, 4 HP, 6 HP, 7.5 HP, and 9.8 HP models. Buyers should confirm their outboard's serial number falls within the applicable range before ordering, since Mercury/Mariner reused horsepower ratings across different production runs with different ignition components. The 18-5140 pairs with the Sierra 18-5212 condenser and is also available as part of the Sierra 18-5008 tune-up kit for engines in the matching serial number ranges.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5140
• Product: Contact Set
• Material: Aluminum, Stainless Steel
• Color: White
• Fuel Type: Gasoline
• Engine Type: 4 Stroke
• Weight: 0.02 pounds
• UPC: 030999237019
• Unit Count: 1 contact set

Fitment

• Mercury/Mariner outboard, 3.9 HP, serial numbers 1655013 to 2498155
• Mercury/Mariner outboard, 4 HP, serial numbers 2498136 to 2693114
• Mercury/Mariner outboard, 6 HP, serial numbers 1610265 to 2529894
• Mercury/Mariner outboard, 7.5 HP, serial numbers 2529895 to 2721150
• Mercury/Mariner outboard, 9.8 HP, serial numbers 1865776 to 2708898

Replaces (OEM)

• Mercury 398-2202
• GLM 70170

Frequently Asked Questions

What does the Sierra 18-5140 contact set fit? It fits Mercury/Mariner outboard motors rated 3.9 HP, 4 HP, 6 HP, 7.5 HP, and 9.8 HP within specific engine serial number ranges, such as 1655013 to 2498155 on the 3.9 HP and 1865776 to 2708898 on the 9.8 HP. Since Mercury reused these horsepower ratings across different production runs, checking your outboard's serial number against the applicable range is the only way to confirm fit.

Is the 18-5140 the same as Mercury part 398-2202? Yes, the Sierra 18-5140 contact set is designed to be interchangeable with Mercury 398-2202 and GLM 70170, and it is built to meet or exceed the original equipment part it replaces.

What condenser pairs with the 18-5140 contact set? The Sierra 18-5212 condenser pairs with the 18-5140 contact set across the same applicable engine serial number ranges.

Is there a complete tune-up kit that includes this contact set? Sierra 18-5008 is the tune-up kit that includes this contact set for outboards falling within the matching serial number ranges.

What is the 18-5140 contact set made of? It is made of aluminum and stainless steel components, materials chosen for durability in a marine ignition environment.

How many contact sets come in one package? One Sierra 18-5140 contact set is included per unit.

How much does the 18-5140 contact set weigh? It weighs 0.02 pounds.

Will the 18-5140 fit any Mercury outboard rated 9.8 HP? Only 9.8 HP Mercury/Mariner outboards with engine serial numbers between 1865776 and 2708898 use the 18-5140; earlier and later 9.8 HP serial ranges use different Sierra contact sets (18-5153 or 18-5139), so checking the serial number is required before ordering.

Is the 18-5140 an OEM part or an aftermarket replacement? The 18-5140 is a Sierra aftermarket contact set engineered to meet or exceed the quality of the original Mercury equipment it replaces, not a Mercury-branded OEM part.

What color is the Sierra 18-5140 contact set? The contact set is white.

Does the 18-5140 work on 2-stroke or 4-stroke Mercury outboards? The 18-5140 is listed for 4 stroke gasoline Mercury/Mariner outboard engines in the applicable HP and serial number ranges.