A standard Hydrocam tensioner has a hydraulic body which, using a hydraulic fluid, exerts a strong tension load on the bolt through the brace screwed on that bolt. In some tensioner types (HTC R), the body is screwed directly on the bolt to be tightened. The body also rests on the skirt in order to apply the reaction force on the assembly to be tightened.
Prior to screwing the body-brace-skirt unit on the protruding end of the bolt, a socket has to be placed on the nut of the bolt. This nut can then be “turned down” (screwed until the lower surface of the nut comes into contact with the assembly bearing surface), by a tommy bar, while the tensioner applies the tension load.
The brace is screwed on the protruding end of the bolt, above the nut. It supplies the tension load exerted by the hydraulic body on the bolt.
Using the fluid under pressure, the hydraulic body creates the tension load on the brace by pushing on the skirt.
The skirt is placed around the nut on the assembly to be tightened. It transmits the compression force to the assembly by reaction to the tension load applied on the bolt by the hydraulic body. Socket for standard nut (optional) In the case of assemblies with standard nuts, a socket is placed around the nut to effortlessly bring the nut into contact with the assembly. For this purpose, the outer surface of the socket is drilled with radial axis holes to hold the push rods. Turning down occurs while the tension load is applied by the hydraulic body.