The part number is followed by a manufacturing date code starting with “W” followed by 4 digits yyww, where yy = last two digits of the year of manufacture and ww = number of the week of manufacture. Some of these early units have been the object of a replacement campaign initiated in April 2018 due to erratic behaviour. Volvo stopped releasing new part numbers for revised modules in 2018 and all subsequent design changes have been made under the latest part number 23195776. It is interesting to point out that no modules labelled 23231607 appear to have ever shipped. The table below, compiled from publicly available information, shows the consecutive model numbers and approximate year of release when it could be determined. The MDI box has had a surprisingly long revision history over the years, aimed at addressing failure modes and on-going reliability issues, with some versions recording high failure rates. The Volvo Penta MDI black box once separated from the engine and most of the wiring harness. For some owners at least, the MDI box rapidly gained fame as the least reliable part of an otherwise excellent engine. Volvo elected to interface these engines to its electronic gauges and controls by using an electronic interface module: the MDI (Mechanical Diesel Interface) black box. While all the larger models are common-rail, fuel injected electronic engines, the smaller D1- and D2-series engines, up to 4 cylinders and 75HP, still operate with traditional mechanical injection pumps. Volvo Penta began the release of the current D-Series marine diesel engines around 2006. IF YOU OWN A FAILED MDI BOX, PLEASE CONSIDER SENDING US PHOTOS OF THE INSIDE AFTER LIFTING THE LID! There have been many revisions of the module and it would be extremely interesting to see what design changes were made. In this article, we have a look at the Volvo Penta MDI electronic black box while relocating it off the side of a Volvo Penta D2-40B engine in order to protect it from the heat and vibrations. Last Updated on 04 December 2022 by Eric Bretscher
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