Nissan MR engine

Kind of engine made by Nissan

The Renault Nissan MR engine family consists of straight four 16 valve all aluminium and water cooled automobile engines with variable valve timing co developed by Renault and Nissan. Renault calls it the M engine. Other noteworthy features of this engine family include acoustically equal runner lengths and a tumble control valve for the intake manifold, a "silent" timing chain, mirror finished crankshaft and camshaft journals, and offset cylinder placement in an attempt for increased efficiency. The MR engine family features 'under stress' manufacture, meaning while the block is being bored, a torque plate puts the block under stress. The block becomes temporarily distorted until the head is torqued onto it, at which point the block is pulled into the correct shape. TOC

The M9R and M9T are a family of straight four 16 valve turbocharged diesel engines co developed by Nissan and Renault, and also Mercedes Benz Group in the case of the M9T/OM699. Following Renault's designation plan, the last letter (M9R resp. M9T) is to indicate the swept volume of 2.0 L resp. 2.3 litres. Despite the similar names, the diesel engines are only loosely related to the MR gasoline engines. M9R is built at Renault's Cleon factory in Normandy. As of late 2018, a new version of the M9R using adBlue and with slightly different internal dimensions replaced the original M9R. Features of the diesel engines include a cast iron block, aluminium alloy cylinder head with double overhead camshafts, 16 valve layout and a bushes timing chain. The M9T is directed to heavier vehicles like the Nissan Navara or the Renault Master. It features a bore and stroke of for a total displacement of , balancer shafts, typical speeds are 3500 rpm for maximum power and 1250 rpm for maximum torque. Low output versions of the M9R for the Renault Trafic II at had been replaced by the Renault R engine with the introduction of the Trafic III, while versions starting from include VNT chargers. The top version of the Navara utilizes the M9T with twin turbochargers and During production period engines had been updated up to Euro 6 (in early 2017).