Mitsubishi 4D56 engine factory workshop and repair manual 1991 onwards on PDF can be viewed using free PDF reader like adobe or foxit or nitro . It is compressed as a zip file which you can extract with 7zip File size 6 Mb Searchable PDF document with bookmarks. Manual Contents Specifications Special Tools Drive Belt and Timing Belt Intake and Exhaust Manifolds Turbocharger Water pump Thermostat hose and pipe Procker Arms Rocker shaft and Camshaft Cylinder Head Valves and Valve Spring Front Case Silent Shaft and Oil Pan Piston and connecting rod Crankshaft Flywheel and Drive PlateCylinder BlockAbout the 4D5 engine The Mitsubishi Astron or 4G5 engine is a series of straight-four internal combustion engines first built by Mitsubishi Motors in 1972. Engine displacement ranged from 1.8 to 2.6 litres making it one of the largest four-cylinder engines of its time.It employed a hemispherical cylinder head chain-driven single overhead camshaft (SOHC) and eight valves (two per cylinder). United States passenger car versions had a small secondary intake valve referred to as the quot;Jet Valve quot;. This valve induced swirl in the intake charge enabling the use of leaner fuel/air mixtures for lower emissions. It was designed as a cartridge containing the valve spring and seat which simply screwed into a threaded hole in the head similar to a spark plug but inside the cam cover. The rocker arms for the intake valve were widened on the valve end to accommodate the cartridge which was equipped with a very soft valve spring in order to avoid wear on the camshaft intake lobe. Modifications to the head were thereby reduced as the Jet Valve negated the necessity for a three-valve-per-cylinder design.In 1975 the Astron 80 introduced a system dubbed quot;Silent Shaft quot;: the first use of twin balance shafts in a modern engine. It followed the designs of Frederick Lanchester whose original patents Mitsubishi had obtained and proved influential as Fiat/Lancia Saab and Porsche all licensed this technology.The 4D5 engine is a range of four-cylinder belt-driven overhead camshaft diesel engines which were part of the quot;Astron quot; family and introduced in 1980 in the then new fifth generation Galant. As the first turbodiesel to be offered in a Japanese passenger car it proved popular in the emerging SUV and minivan markets where Mitsubishi was highly successful until super related info
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