Sierra 18-5280 In-Line 4 Delco EST Ignition Tune-Up Kit, Replaces Mercruiser 811635Q1

The Sierra 18-5280 Tune Up Kit is an ignition tune-up kit designed for in-line 4 Delco EST applications. It is built to work with the Sierra 18-5475 Delco HEI distributor used on GM 4 cylinder engines, making it a straightforward way to freshen up the ignition system on a compatible in-line 4 Delco EST setup. The kit bundles the two components most commonly worn out in an ignition tune-up: a distributor cap and a rotor, so both parts are replaced together for even wear and reliable spark delivery going forward.

Inside the kit you will find a Sierra 18-5361 distributor cap and a Sierra 18-5406 rotor, both manufactured to meet or exceed the performance of the original equipment parts they replace. The distributor cap and rotor are finished with a machined exterior for a precise fit against the distributor housing and points/contacts. This kit is intended as a direct interchange for a number of OEM and aftermarket part numbers, so it can be used as a like-for-like replacement without modification on applications that call for those numbers.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5280
• Product Type: Ignition Tune-Up Kit
• Engine Application: In-Line 4 Delco EST
• Compatible Distributor: Sierra 18-5475 Delco HEI Distributor (GM 4 Cylinder)
• Kit Includes: Sierra 18-5361 Distributor Cap, Sierra 18-5406 Rotor
• Finish: Machined
• Weight: 0.47 pounds
• Product Dimensions: 5.6 x 4.9 x 3.7 inches
• UPC: 808282105099

Fitment

Designed for in-line 4 Delco EST ignition applications, including use with the Sierra 18-5475 Delco HEI distributor (GM 4 cylinder).

Replaces (OEM)

• CDI E66-0003
• GLM 71830
• Mallory 9-29320
• Mercruiser 811635Q1
• Mercruiser 811635Q2
• Mercruiser 811635T2

Frequently Asked Questions

What does the Sierra 18-5280 Tune Up Kit include? The Sierra 18-5280 kit includes one Sierra 18-5361 distributor cap and one Sierra 18-5406 rotor, giving you both ignition components needed for a tune-up in a single kit.

What engines is the 18-5280 tune-up kit designed for? It is designed for in-line 4 Delco EST ignition applications, and it can be used with the Sierra 18-5475 Delco HEI distributor on GM 4 cylinder engines.

Is the Sierra 18-5280 a genuine Sierra part or aftermarket? 18-5280 is a genuine Sierra part number, and the distributor cap and rotor it contains (18-5361 and 18-5406) are also Sierra components, built to meet or exceed the original equipment parts they replace.

What OEM and aftermarket numbers does the 18-5280 kit cross-reference to? The Sierra 18-5280 is interchangeable with CDI E66-0003, GLM 71830, Mallory 9-29320, and Mercruiser 811635Q1, 811635Q2, and 811635T2.

How much does the 18-5280 tune-up kit weigh? The kit weighs 0.47 pounds.

What are the dimensions of the Sierra 18-5280 kit as packaged? The product measures 5.6 x 4.9 x 3.7 inches.

Can this kit be used with a Mercruiser stern drive calling for part 811635Q2? Yes, the Sierra 18-5280 kit is a direct interchange for Mercruiser stern drive part numbers 811635Q1, 811635Q2, and 811635T2.

Does the 18-5280 kit work with the Sierra 18-5475 distributor? Yes, the 18-5280 tune-up kit is designed to be used with the Sierra 18-5475 Delco HEI distributor for GM 4 cylinder applications.

What finish is used on the distributor cap and rotor in this kit? The components in the Sierra 18-5280 kit have a machined exterior finish.

Why replace the distributor cap and rotor together instead of separately? The Sierra 18-5280 bundles the 18-5361 distributor cap and 18-5406 rotor so both wear-prone ignition parts are refreshed together, helping maintain even ignition performance rather than replacing just one worn component.

Is the Sierra 18-5280 a fit-specific kit or a universal kit? It is fit specific to in-line 4 Delco EST ignition applications, so the part numbers should be checked against the application before ordering.