The timing chain tensioner is located on the right side of the engine, above the coolant pump.

Oil is supplied to the hydraulic tensioner through a steel seamless tube 6 mm in diameter with tips.

The tube is connected to a threaded hole into which the emergency oil pressure sensor fitting is screwed.

Correctly selected bending rigidity of the tube made it possible to weaken its vibrations; moreover, metal holders with rubber inserts that suppress vibration are used.

The tip of the tube is attached to the tensioner body using a bolt-fitting, which is used to fasten the front brake hose of cars with rear wheel drive and all-wheel drive VAZ families.

The tensioner plunger presses on the shoe, which, like the chain guide, is made of wear-resistant plastic.

The tensioner shoe pivots on an axle located at the bottom of the cylinder block to the right of the crankshaft sprocket.

Removing the chain tensioner

Снятие и дефектовка гидронатяжителя цепи ВАЗ-2123Снятие и дефектовка гидронатяжителя цепи ВАЗ-2123

With a 13 head, unscrew the bolt securing the oil supply pipe to the tensioner

Remove the copper washer and take out the bolt-union with a copper gasket

Снятие и дефектовка гидронатяжителя цепи ВАЗ-2123Снятие и дефектовка гидронатяжителя цепи ВАЗ-2123

With a 10 head, we evenly unscrew the two nuts securing the tensioner to the block head

Removing the tensioner

Снятие и дефектовка гидронатяжителя цепи ВАЗ-2123Снятие и дефектовка гидронатяжителя цепи ВАЗ-2123

Details of fastening the oil supply pipe to the tensioner

A gasket is installed under the tensioner

After inspection and fault detection, install the tensioner in the reverse order.

Operation and fault detection of the hydraulic chain tensioner

Снятие и дефектовка гидронатяжителя цепи ВАЗ-2123

Oil from the lubrication system through pipe 3 (see Fig. 7) enters the cavity (E) of the tensioner, then through the hole (e) and the valve unit 2 enters the working cavity (B) and presses on the plunger 5.

The tensioner body 1 has a hole 1 mm in diameter for bleeding air from cavity (E).

The diametral clearance between the body 1 and the plunger 2 should be 0.018-0.024 mm and is measured as the difference between the maximum measured diameter of the plunger 2 and the minimum measured diameter of the body 1.

During repair, the tensioner housing and the plunger make up a pair in which the replacement of one part with another after the selection of the gap is not allowed.

Plunger 2 must move without jamming in body 1 by a stroke equal to 16 mm.

When installed on the engine, the tensioner must be free of oil, pin 4 must not protrude from the housing.