The VCV valve controls the critical shifting patterns of most diesel automatic transmissions from 1978 to 1985. This includes the 1978 to 1985 300SD, the 1980 to 1985 W123 300D, 300CD and 300TD and the 1980 to 1983 240D. These are no longer available new and most of the used ones you may try to purchase are not working properly or worn out. Kent set out to find a way to repair them only to discover that only about 50 to 60 percent can be restored to work properly. See the video below for a more detailed explanation.
Product Details
This kit, along with three on-demand videos, will help you open up, test, and hopefully repair your VCV valve. The kit includes the following as shown above.
- Modified screwdriver to open up the valve without damaging it.
- Press clamp to aid in cleaning the vacuum bleeder valve
- New rubber o-ring
- Silicone and swabs to help with assembly
You will also need a vacuum hand pump tester in order to complete the testing and service. If you do not already have one you can purchase it separately. See related products below. With the vacuum hand pump tester and the tools and supplies in the kit you will quickly learn if your VCV is even repairable. If not, you can begin your hunt for a good used one and know how to test it quickly either before purchase or before installing on your diesel.
Related Products:
1978 to 1985 Diesel VCV ( Vacuum Control Valve ) Internal Inspection and Service Instructions - On Demand Video
Kent delivers a very detailed 24 minute video on understanding how this valve works and how to fix it if possible. You will learn how to recognize a valve that is just too worn out to repair. No bleeder valve repair parts are available and there is not way to DIY fix one if it is badly damaged.
616 617 Diesel VCV Shift Control Rod and Clip
ONLY ONE LEFT. Good used activation rod and plastic clip as shown. Controls travel of vacuum control valve on the top rear of the injection pump. A plastic clip can easily break. May be some slight wear on the end of the metal rod but still usable.
Diesel Automatic Transmission VCV Vacuum Controls Testing Kit
This unique kit will allow you to hook up a 30 in HG vacuum gauge between your vacuum control shifting valve (VCV) and your transmission modulator to test the VCV for proper function and to tune it for peak shifting performance.
Diesel VCV Valve Installation and Linkage Adjustment Instructions - On Demand Video
In this 17 minute instructional video Kent will walk you through removing and installation a VCV valve off the back of the injection pump and the proper way to adjust the linkage travel for best performance. A number of tips will be shared to reduce frustration and prevent problems.
How to Test the VCV ( Vacuum Control Valve ) for Proper Operation - On Demand Video
Kent will explain the theory of operation in simple terms, why it is so important for proper transmission shifting performance, and how to test it hooked up to the engine's vacuum system with the engine running.