NOTE: Bonanza does not require an account. Just add the item to your cart and proceed to payment. This is for a genuine Mercedes original overflow valve for the OM616 and OM617 diesel engines in good used condition. Image shown is an example. This valve is actually specified as a maintenance item. Odds are yours is way past due. This valve is located on the side of your injection pump and is removed with a single wrench. This is the original serviceable two-piece version. If you look in the online forums someone sells an improved spring for these. A fresh OFV spring gives a noticeable boost in engine performance. Since our injection pumps are aging, adding a stiffer spring gives even more dramatic results by boosting injection pump element fill rates to original specs. This original two-piece version is no longer being made. Mercedes now just offers the sealed one-piece design which are not serviceable and cannot be upgraded. This original two-piece design allows you to open the valve to service it and modify the spring. Another trick for better pressure and faster injection pump element fill rates is to simply add a ballpoint pen spring coiled into the existing spring. It's very effective and much cheaper than buying a custom spring. Applications: OM616, OM617, OM601, OM602, OM603, OM604, OM605(290TD), OM606, OM662 Free shipping in the U.S. SHIPPING ADDRESS: I can only send your item to the registered PayPal shipping address at time of payment.