Renault J5R, J6R engines
Content
In the late 70s, the joint efforts of Renault and PSA engine builders developed a new series of J series power units. It included J5R, J6R, J7R and J8R. In addition to this name, they are known as motors of the Douvrin engine family.
Description
The J family engine was first introduced in 1977. Removed from production since 1996. Produced at the plant in Duvrin (France). The motor in its original form was not widely used, which cannot be said about its modifications.
It is a gasoline in-line four-cylinder aspirated engine with a volume of 2,0 liters, with a capacity of 82-103 hp. with and a torque of 16,5 Nm.
It was installed on Renault 25 I cars from 1977 to 1996 in various modifications. Additional J engines can be seen under the hood:
- Traffic I (1986-1989);
- Space I (1984-1990);
- Safrane I (1992-1996).
Gasoline engines of the J family had a common mechanical part.
The cylinder block is made of aluminum alloy. Cast iron sleeves.
The crankshaft has five bearings. Subjected to induction hardening. The counterweights of the shaft are cast. Steel-babbit inserts.
Forged, steel connecting rods. The head bearings are made from tin-aluminum alloy.
The pistons are standard, aluminum, with three rings (two compression and one oil scraper).
Aluminum cylinder head. The combustion chambers are cylindrical.
Timing belt drive mechanism.
An innovative novelty of that time was the heating of the air passing through the air filter.
Technical specifications
| Manufacturer | French Mechanical Company | |
|---|---|---|
| Engine code | J5R | J6R |
| Volume, cm³ | 1995 | |
| Power, hp from | 82 | 103 |
| Torque, Nm | 16.5 | |
| Compression ratio | 8.1 | 9.2 |
| Cylinder block | aluminum | aluminum |
| Block configuration | in-line | in-line |
| Number of cylinders | 4 | 4 |
| The order of the cylinders | 1-3-4-2 | 1-3-4-2 |
| Cylinder head | aluminum | aluminum |
| Cylinder diameter, mm | 88 | 88 |
| The piston stroke, mm | 82 | 82 |
| Number of valves per cylinder | 2 | 2 |
| Timing drive | belt | belt |
| Hydraulic compensators | no | no |
| Turbocharging | no | no |
| Fuel system | carburetor Weber 28*36 Dara 0/OC | |
| Fuel | gasoline | gasoline |
| Location | transverse |
What do modifications mean?
Almost immediately after the design of the engine base, its modifications began to be created.
Their main differences were in the modified equipment and attachments.
Gradually, the carburetor was replaced by an injector, noticeable differences in the purpose for working with different transmissions (manual transmission or automatic transmission), replacement of the composition of materials of components and mechanisms, as well as other innovations gave rise to the next modifications of the motor.
Some versions were turbocharged. There are motors with 12 valve cylinder heads. In accordance with the changes made, the power and torque of the engine changed.
A lot of attention was paid to raising the class of environmental standards.
| Engine code | Power | Torque | Compression ratio | Years of issue | Installed |
|---|---|---|---|---|---|
| J5R 716 | 80 liters with | 147 Nm | 9.2 | 1986-1989 | Renault Trafic I (T5, T6, T7) |
| J5R 722 | 80 l. s at 5000 rpm | 147 Nm | 9.2 | 1986-1989 | Renault Traffic (T5, T6, T7) |
| J5R 726 | 80 l. s at 5000 rpm | 147 Nm | 9.2 | 1986-1989 | Renault Traffic (T5, T6, T7, TXW) |
| J6R 234 | 109 l. s at 5500 rpm | 160 Nm | 9.2 | 1984-1990 | Space I, J11 (J/S112) |
| J6R 236 | 109 l. s at 5500 rpm | 160 Nm | 9.2 | 1984-1990 | Space I, (J11, J/S112) |
| J6R 706 | 101 l. s at 5500 rpm | 158 Nm | 9.2 | 1984-1989 | Renault 25 I (R25, B29_) |
| J6R 707 | 101 l. s at 5500 rpm | 158 Nm | 9.2 | 1984-1989 | Renault 25 I (R25, B29_) |
| J6R 734 | 101 l. s at 5500 rpm | 158 Nm | 9.2 | 1988-1990 | Space I, J11 (J/S112) |
| J6R 760 | 101 l. s at 5500 rpm | 158 Nm | 9.2 | 1984-1989 | Renault 25 I (R25, B29_) |
| J6R 762 | 101 l. s at 5500 rpm | 158 Nm | 9.2 | 1984-1989 | Renault 25 I (R25, B29_) |
| J6R 763 | 101 l. s at 5500 rpm | 158 Nm | 9.2 | 1984-1989 | Renault 25 I (R25, B29_) |
| J7R 722 | 120 l. s at 5500 rpm | 164 Nm | 10 | 1988-1992 | Renault 25 I (R25) |
| J7R 723 | 120 l. s at 5500 rpm | 164 Nm | 10 | 1988-1992 | Renault 25 I (R25) |
| J7R 726 | 135 l. s at 6000 rpm | 174 Nm | 9.3 | 1988-1992 | Renault 25 I (R25, B294) |
| J7R 732 | 105 l. s at 5000 rpm | 155 Nm | 9.2 | 1992-1996 | Saffron I (B54E) |
| J7R 733 | 105 l. s at 5000 rpm | 155 Nm | 9.2 | 1992-1996 | Saffron I (B54E) |
| J7R 734 | 132 liters with | 9.3 | Safrane I (B54_) | ||
| J7R 735 | 132 liters with | 9.3 | Safrane I (B54_) | ||
| J7R 740 | 135 l. s at 6000 rpm | 174 Nm | 9.3 | 1989-1994 | Renault 21 I (L48, K48, B48) |
| J7R 746 | 120 l. s at 5500 rpm | 164 Nm | 10 | 1986-1989 | Renault 21 I (L48, K48) |
| J7R 747 | 120 l. s at 5500 rpm | 164 Nm | 10 | 1986-1989 | Renault 21 I (L48, K48) |
| J7R 756 | 162 l. s at 5500 rpm | 260 Nm | 8.5 | 1989-1993 | Renault 21 I (L48) |
| J7R 760 | 120 l. s at 5500 rpm | 164 Nm | 10 | 1988-1990 | Space I (J11) |
| J7R 768 | 103 l. s at 5250 rpm | 159 Nm | 10 | 1991-1996 | Space II (J63) |
Reliability, weaknesses, maintainability
Reliability
The reliability of the J-series internal combustion engines is beyond doubt. Here the formula “The simpler, the more reliable” works. In addition to the simplicity of the device, the manufacturer additionally secured himself to increase reliability.
For example, reductions in oil renewal periods have been proposed. Oil change after 10 (7,5) thousand kilometers, timing belt - after 120 (60) thousand km. The values 10 and 120 are from the manual for the repair, operation and maintenance of a Renault 25 car with a J6R engine, but the manufacturer recommends halving these values (numbers in brackets).
The reliability of the internal combustion engine is confirmed by significant performance indicators. Running more than 300 km without major repairs is not uncommon.
Thus, naturally aspirated 8-valve versions proved to be quite reliable.
Weak spots
The weak points include primarily the electrical part of the internal combustion engine.
Seals (gaskets) require constant attention. Leakage of oil, coolant, fuel is not uncommon.
The remaining malfunctions of a mass nature are not.
Maintainability
Judging by the fact that the operation of the motor continues at the present time, the only conclusion suggests itself - high maintainability. Cast iron sleeves allow you to bore them to any repair size. Mounted units and spare parts can be picked up not only in stores, but also on the secondary market.
Repair is also not difficult due to the simple design of the engine. Despite this, knowledge of some of the nuances of recovery is necessary. For example, according to the manufacturer's requirements, lapping (grinding) of the cylinder head is not allowed.
In addition, you need to take into account the high cost of spare parts, which is typical for French units.
Assessing all the factors of the upcoming repair. The option of purchasing a contract engine should be considered. It might turn out to be much cheaper.
The pure J5R and J6R engines are history. Based on them, numerous modifications are made that are used in modern Renault car models.
