Miller 8387 and 8516A Tool Comparison – 3.7 and 4.7 Dodge & Jeep

1:08 pm Dodge Dakota, Jeep

Miller 8516A and 8387 004 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.

We’ve had customers ask if they can get by with one and not have to purchase both. The answer depends on what job is being done. We do have many customers that decide to get both. The 8516 cannot be used to change the valves because the valve keeper cannot be accessed. The 8387 can be used to remove and install the rockers (sometimes to access the hydraulic lifters) but there’s a possibility of the keeper falling out of position. When changing valve springs it’s important to follow repair manual instructions which involves putting compressed air into the cylinder to help prevent the valves from dropping. There are also some videos with guys showing how to remove the rocker arms with just a screwdriver. They haphazardly just pry the rocker arm out using the precision machine cam lobe as their fulcrum point. and let the rocker land where it may. This is NOT a good idea. Prying a screwdriver against the cam is sketchy at best. Some videos show a bulky homemade tool being used for the valve spring removal. This can also cause nicks and scrapes on crucial engine components. Making even a small scratch on a cam lobe could lead to rapid wear (with a roller rocker or not). Even a small scratch or nick can cause problems because the cams spin thousands of times even on short trips.

As you can imagine, a nick or scratch can wreak havoc rather quickly. So when working on a 3.7 or 4.7 we recommend using the appropriate tool, either the Miller 8387 or the 8516A or both. These specialty tools are the ones that the Jeep, Chrysler, Dodge dealers use for good reason. They are small, made to fit correctly and do NOT damage the camshaft. Call us at 800-524-9783 to order or see the following links for more information, Miller 8387 and the Miller 8516A.

3 Responses
  1. dennisb - Auto Tool Sales :

    Date: December 27, 2016 @ 3:01 pm

  2. John Benetti :

    Date: May 4, 2017 @ 11:42 pm

    Wondering if you have a tool for a the Mazda Skyactiv 2.5 engine, that in like manner, will allow the roller rockers to be removed. My vehicle is a 2017 Mazda6 2.5… but I suspect the tool fits from maybe 2012 (for the Mazda3, thru current year for a number of vehicles with the Skyactiv engines. Thank you! J Benetti.

  3. dennisb - Auto Tool Sales :

    Date: May 5, 2017 @ 7:42 am

    John, not seeing a specific tool for the Mazda 2.5. If you come up with a tool number I’d be happy to look into this further. Sometimes a repair manual like Mitchell or AllData will provide a specific factory tool number. Good Luck.

Comment Below, Please Unlock Caps

Tell us your thoughts or ask a question. For best results please provide relevant details like your vehicle's year, make, model, engine size, the problem and when it occurs etc. - Comments need to be approved before they are seen by everyone. Notice we don't post Spam. Comment below (*SPAM, ALL CAPS & unrelated comments will be deleted). Click the following to view Dennis' "about page" for info on his background in automotive repair.

Please note: Your comment will not be posted until it's approved. We appreciate and read all on topic, relevant comments. Please don't ask for repair manual info like torque specs, wiring diagrams and specific repair procedures. If quick assistance is needed with purchasing a tool or part, please visit our tool website or call to place an order at 800-524-9783. *Note we don't offer repair advice on the phone.