Cloyes 9-3127-5 Engine Timing Set

Cloyes 9-3127-5 Performance Timing Set

Cloyes 9-3127-5 is a performance engine timing set built for Jeep applications that use the original race and a 5.040" crankshaft-to-camshaft center distance. It combines a billet crank sprocket with three keyways for timing adjustment and a TRUE Roller double roller chain for reduced friction.

Key Features

• Billet crank sprocket with three keyways for +/- 4 degrees adjustability
• Maximum camshaft advance: 2 degrees
• Maximum camshaft retard: 2 degrees
• Double roller timing chain with 0.250" roller diameter
• Heat-treated sprockets for added durability
• Hand-matched 3-piece set to help qualify correct center distance and minimize runout
• Steel crankshaft sprocket and metal camshaft sprocket
• Sprockets included; tensioner not included

Detailed Description

This Cloyes timing set, part number 9-3127-5, is engineered for Jeep engines that require precise cam timing control and stable chain operation. The adjustable crank sprocket gives you timing correction options without changing the overall timing set layout, while the double roller chain helps reduce friction in the valvetrain drive. For Jeep Wrangler, Cherokee, CJ5, CJ7, Grand Cherokee, Comanche, Wagoneer, J10, J20, Scrambler, and TJ applications, this set supports accurate timing setup where the engine crankshaft to camshaft center distance is 5.040".

This part cross-references 10339 and 10340 for the same application.

What It Is Used For

• Correcting cam timing during engine rebuilds
• Replacing worn timing chains and sprockets
• Reducing timing chain friction and slack
• Setting advance or retard within the available adjustment range
• Restoring timing stability in high-mileage Jeep engines

Installation Notes and Tips

Verify engine center distance before installation and confirm the original race specification matches the application. The adjustable crank sprocket provides three keyway positions, so timing should be set carefully during assembly. Because the tensioner is not included, inspect the existing tensioning components and related wear items before final installation. Always follow the service manual for cam timing procedures and torque specifications.

Quality Assurance

Cloyes uses heat-treated sprockets and a hand-matched 3-piece set process to help maintain proper center distance and reduce runout. The TRUE Roller chain design and performance-grade construction support consistent timing operation in Jeep engine applications.