One of our most popular tools recently has been the Win 3747-123. It takes the place of the Miller 8516A, 8387, 8426 and 10102. This tool is used to work on 3.7 V6 and 4.7 V8 Chrysler engines used in many Mopar applications. The tool can be used to change out or re-install the rockers when they fall (a common problem). Or the combo tool can be used to replace broken valve spring or install valve seals. The Valve Holder is required to help prevent dropping a valve if removing the keeper depending upon the job being done. No valve holder is needed if not removing the keeper. Repair manual instructions should always be followed. Read the rest…

DenLorsTools.com Summary: Automotive repair blog and video comparing two Miller specialty tools. We have had a lot of questions regarding the Miller 8387 Valve Spring Compressor and the 8516A Rocker Arm Remover/Installation Tools. Both look similar and are for use on Dodge and Jeep 3.7 and 4.7 liter engines. These motors are commonly used in Jeep Liberty, Dodge Durango, Dodge Dakota, Jeep Grand Cherokee etc. *Note – The 8516 has been updated and the newest number has an “A” on the end now making it 8516A. Each tool is for a different job. The valve spring tool allows access at the valve keeper so a magnet can be used to remove it. The 8516A does not have the opening to allow access to the valve keeper.

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