The Douvrin engine is a four cylinder - internal combustion engine for automobiles , which from 1977 to 1997 by the La Française de Mécanique was made, a joint venture between Renault and PSA Group (Peugeot). This is also called J-engine.
The engine is water cooled. Engine block and cylinder head are made of aluminum . The crankshaft is 5-times stored. The camshaft is in the cylinder head and is driven by a toothed belt. The engine was built as a petrol engine and for diesel fuel , with 8 and 12 valves . There were also versions with turbocharger. The displacement is 2.0 or 2.2 liters.
The Douvrin engine was introduced to the press in 1977. Chief developer was Jean-Jacques His , who was also the father of Formula 1 engines, with which, among other things, Ferrari was equipped. One of the first cars with the Douvrin engine was the new Renault 20 TS . In 1979, the Société Française de Mécanique introduced the first diesel engine, type J8S, which was first used in the Renault 20 .
In 1980, the Renault 18 also got the diesel engine 852 (J8S), a few months later, in August 1980, the 2.2-liter engine type 851 (J6T) in the Renault 20 TX. In the same year the Renault 20 turbo diesel appeared with the engine J8S turbo. One year later followed the Renault 30 turbo diesel with the same engine, the end of 1983 the Renault 25 and two years later the Renault 21 . The last two models were optionally the 2.0 and 2.2-liter gasoline engines with injection under the designations J7R and J7T. The versions R25 TS and GTS kept the J6R engine with carburettor. The engine J7T in the R25 was with 123 HP (as J7T 706 or J7T 707 for automatic transmission). In September 1986, the performance was increased to 126 hp, the engines were now called J7T730 (for manual transmission) and J7T731 (for automatic transmission). There were then versions with catalytic converter and 110 hp (models J7T 708 and J7T 732).
The commercial vehicles Renault Trafic and Renault Master got the 2.0-liter engine with a simple carburetor as the J5R. The last Trafic until 1997 got a J7T with only 101 HP.
In August, the Renault 21 Turbo with 2 liters and 175 bhp was presented. The engine is called J7R-752.
In the winter of 1988 (model year 1989) came the cylinder head with 12 valves, which was installed in the Renault 25 TXI. This engine was also used from mid-1991 in the Renault Espace II and in the first series of the Renault Safrane , model years 1992 to 1996.
The end of the Douvrin engine came with stricter pollution laws.
Peugeot has used the Douvrin engine in the Peugeot 505 and the Citroën CX (Reflex, Athéna, Leader, 20RE, 20TRE and 22TRS models); This got a double carburetor. Also, the Talbot-Matra Murena should be equipped with the engine, but Renault has ultimately decided against it, since the engine should be used instead in the new Fuego .
The Douvrin diesel engines (J8S) were not used by Peugeot.
|grade||829 - J5R - J6R - J7R||851- J6T - J7T||852 - J8S - J8ST|
|Number of teeth of the toothed belt||116||118||148|
Douvrin engine Technical details and specifications (1977-1997)
Douvrin engine 2.2L J7T
No. of cylinders 4/OHC
Firing order 1-3-4-2
Compression ratio 9.2:1
Diagnostic socket Yes
Ignition coil Make Renix
Distributor Make Renix/Siemens
Fuel system pressure 2.8-3.2 bar
Oil pressure 3.0 bar @ 3000 rpm
Thermostat opens 88°C
Starter motor Make Paris Rhone D11E172
Minimum starting voltage 10.5V
Maximum cranking amps 135-165A
Alternator Make Paris Rhone A14N62
Regulated voltage 13.5-15.0v
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Douvrin engine Service Guide (1977-1997)
Douvrin engine 2.2L J7T
Spark plugs Electrode gap 0.8-0.9mm
Spark plugs Original equipment Champion S7YCC
Spark plugs Make Bosch H6DC
Spark plugs Make Champion S7YC
Spark plugs Make NGK BP7EFS
Valve clearance -INLET 0.10-0.15 mm check cold
Valve clearance -EXHAUST 0.20-0.25 mm check cold
Engine oil change 6.2 litres
Engine oil grade - moderate climate 10W/30 SAE or 10W/40 SAE
Engine oil grade - cold climate 5W/30 SAE
Engine oil grade - hot climate 15W/50 SAE
Manual gearbox oil 75W/80 SAE 2.4 litres
Automatic transmission Type Dexron II 4.0 litres
Differential oil rear 80W SAE 1.3 litres
Cooling system 6.8 litres
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