Lubricator for the rear axle trailing arm of Peugeot Citroen Suspension-Marxxon

The Peugeot Citroen owners often face the problem of the short life and costly repair of the rear axle. Fitted in pressure lubricator may be will reduce the breakdown risk.

The rear axle problem is concentrated in the unit: the trailing arm, pin (axle), needle bearing. The rear axle of Peugeot, Citroen has two units of that kind: the right and the link one. Each of them includes: one pin (another for it – the rear axle shaft), two needle bearings (the inner and the outer ones), trailing arm (close to equalizing bar).

One of every needle bearings usage conditions is the presence of the lubricant, which reduces the friction and protects from the moisture. It might be hard by the rear axle needle bearing, because it requires disassembling of the whole unit to check the lubricant and to lubricate the needle bearing. The needle bearings of Peugeot, Citroen are usually changed after 80 000 kilometrage and the new ones lubrication is supposed to last for the next 80 000 km. But if the load of this unit taken in account, one may have a wish to check the bearing and lubricant. As far as it is inconvenient to disassemble the unit each time for that, one may be interested in lubrication with the help of the special fittings called lubricators.

The article Review of the lubricators will help you to get your own idea of these units and choose the right lubricator. Because of their working conditions and location fitted in pressure lubricators of the rear axle trailing arm of Peugeot, Citroen must have some specific qualities. It is important for the fitted in lubricator to have anticorrosive coating or to be made of stainless steel. If you have ever happened to unscrew the old lubricators, you may decide to use the lubricator, made of the stainless steel.

To choose the right pressure lubricator, mind its thread. Some pressure lubricators have no thread and are intended for the pressing-in. Such lubricators are very hard to replace ant there are no reasons to use them in the rear axle. But mostly lubricators presuppose the thread fit. The thread might be conical or plain (square, cylindrical). The majority of domestic and imported lubricators have the M6 — M10 fine thread or the conical one of 1/8″—1/4″. The lubricators with the conical thread are easier to unscrew. But the conical threading requires experience. lubricators pressing-in angle of 45°, 90°. Feed of the lubricant is carried out with the help of the syringe.

There are direct lubricators and inclined at an angle of 45°, 90°. One the one hand, indirect lubricators can be used in the nooks, where the syringe can hardly be used. However, indirect lubricators would better be used only when it is impossible, to use direct ones. Indirect pressure lubricators have two disadvantages:indirect oil gallery and, as follows, complicated injection and surplus resistance for the syringe During injection the syringe should be strongly pressed against the lubricator. In case with the direct lubricators the direction of the pressure presses the lubricator against the beam. That will give the fixed stop and be helpful for the procedure of the lubrication. Whereas in case with the indirect lubricator the direction of the pressure goes tangentially to the beam surface and does not let to distribute efforts efficiently. At the same time, the force tends to tear the lubricator off, to move it on the beam surface along with the tangential effort.

There is a question: is it necessary to bore a hole for air release in the rear axle trailing arm while lubrication? In the standard situation the air is released through the stuffing box of the outer needle bearing. But when the extra gasket for stuffing box protection is placed, as described in Rear axle problem, Protection of the needle bearing stuffing box, the air release might be hindered. Necessity of boring the hole can depend on the condition of the syringe. Defective syringe or lack of the experience may cause the stuffing box not release air.