Sierra 18-5274 Ignition Tune-Up Kit, Replaces GLM 71790, for MerCruiser 4.3L/LH/LX/LXH V6 Alpha/Bravo Gen+

The Sierra 18-5274 Ignition Tune-Up Kit supplies the core ignition components needed to service MerCruiser 4.3L V-6 sterndrive and inboard engines. The kit contains a rotor assembly (Sierra 18-5432) and a distributor cap (Sierra 18-5396), the two parts most commonly worn or fouled during regular ignition maintenance on these engines. Sierra engineers each component to meet or exceed the specifications of the original equipment part it replaces, so the kit restores factory-correct ignition timing and spark distribution without modification to the distributor housing.

This kit is built for MerCruiser 4.3L/LH/LX/LXH 262 cid V-6 engines fitted with Alpha One Gen+ or Bravo Gen+ drives, as well as the earlier 205 and 4.3LX (4bbl) engine models. It ships in a labeled display package for easy identification at the point of sale or in a parts inventory. Replacing the rotor and cap together at the same service interval helps prevent cross-firing, hard starting, and misfires caused by a worn distributor cap or a pitted rotor tip.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5274
• Product Type: Ignition Tune-Up Kit
• Kit Contents: Rotor Assembly (18-5432), Distributor Cap (18-5396)
• Replaces: GLM 71790, Mallory 9-29317
• Compatible Engine: MerCruiser 4.3L/LH/LX/LXH 262 cid V-6 (Alpha Gen+ and Bravo Gen+), serial numbers F803000 and up
• Also Fits: MerCruiser 205, 4.3LX (4bbl) 262 cid V-6, serial numbers A331455-F802999
• Weight: 0.68 pounds
• Package Dimensions: 5 x 6 x 9 inches
• Packaging: Display package
• UPC: 808282234324

Fitment

• MerCruiser 4.3L/LH/LX/LXH V6, Alpha Gen+, 1996-2001, serial numbers F803000 & up
• MerCruiser 4.3L/LH/LX/LXH V6, Bravo Gen+, 1996-2001, serial numbers F803000 & up
• MerCruiser 205, 4.3LX (4bbl), 262 cid V-6, serial numbers A331455-F802999

Replaces (OEM)

• GLM 71790
• Mallory 9-29317

Frequently Asked Questions

What does the Sierra 18-5274 tune-up kit include? The Sierra 18-5274 kit includes a rotor assembly (Sierra 18-5432) and a distributor cap (Sierra 18-5396), the two components most often replaced during ignition service on MerCruiser 4.3L V-6 engines.

Which MerCruiser engines does the 18-5274 kit fit? This kit fits MerCruiser 4.3L/LH/LX/LXH 262 cid V-6 engines with Alpha Gen+ or Bravo Gen+ drives (serial numbers F803000 and up), as well as the earlier 205 and 4.3LX (4bbl) V-6 models (serial numbers A331455-F802999).

Is the Sierra 18-5274 kit a genuine OEM part or an aftermarket replacement? The 18-5274 is a Sierra aftermarket kit engineered to meet or exceed the original equipment part it replaces; it is not a Mercury Marine branded part.

What OEM or aftermarket numbers does 18-5274 cross-reference to? Sierra 18-5274 is interchangeable with GLM 71790 and Mallory 9-29317, so any of those part numbers should point a buyer to the same kit.

How much does the tune-up kit weigh? The Sierra 18-5274 tune-up kit weighs 0.68 pounds as packaged.

What are the package dimensions of the 18-5274 kit? The kit ships in a display package measuring 5 x 6 x 9 inches.

Does the 18-5274 kit include spark plugs or spark plug wires? No. The kit contains only the rotor assembly (18-5432) and distributor cap (18-5396); spark plugs and plug wire sets are sold separately.

Can this kit be used on both Alpha and Bravo drive configurations? Yes, the Sierra 18-5274 kit is listed for both Alpha Gen+ and Bravo Gen+ MerCruiser 4.3L V6 engines with serial numbers F803000 and up.

How do I know if my engine's serial number falls in the covered range? Check your MerCruiser engine's serial number tag: the 18-5274 kit covers serial numbers F803000 and up for the 4.3L/LH/LX/LXH V6 Alpha/Bravo Gen+ engines, or A331455-F802999 for the earlier 205 and 4.3LX (4bbl) models.

Why replace the rotor and distributor cap together? Servicing the rotor (18-5432) and distributor cap (18-5396) together, as bundled in the Sierra 18-5274 kit, prevents mismatched wear between the two parts from causing misfires or cross-firing.

Is the Sierra 18-5274 kit backed by a warranty? Sierra parts, including the 18-5274 tune-up kit, are covered by Sierra's Customer Satisfaction Warranty against defects in workmanship and materials for the useful life of the product.