Crankshaft Pulleys Tips about change of Crankshaft Pulleys For these reasons nowadays, the recommendations of the vehicle manufacturers choose to the manufacturer, as well as the fixing crankshaft pulleys essentially with screws of the pulley, always three different parts (image 1). Once respecting the corresponding the manufacturing process of the torque. pulley is finished, it is extremely Otherwise, you run the risk that important that the pulley is perfectly one of the components is working equilibrated. The holes shown on the badly and can generate a break surface of the pulley note this fact. from any of the other parties. It is for these reasons that we must avoid to mount solid pulleys, manufactured from a metallic single piece, without the internal damper structure, which can be also found on the market. Image 1 The crankshaft pulley is located in one It is difficult to generalize about the of the extremes of the crankshaft, and number of driven kilometres in which his main function is to move the it must be replaced, as every damper auxiliary elements of the engine, as for pulley is different due to the great example, the alternator, assist steering variety of existing engines, with pump, water pump, air conditioned different cylinder numbers, elasticity compressor… through a V-belt known of the associated pieces, and the use to as poly V. which the engine has undergone, but Also, along with the flywheel, helps to generally is situated between 60.000 absorb the crankshaft vibrations, and 100.000 kilometres. caused by the power pulses generated However, is very important its review by the pistons, and to correct the and replacement mainly: oscillations during its rotation. -If are detected fissures, lose or irregularities of the visible rubber. Those vibrations can cause noise, an 1. A steel core which is excessive weathering of the tensioners -Excessive presence of oxide or clear coupled to the crankshaft. and bearings besides being very contact signs on the slots external harmful to the V-belt work making it be parts. 2. An internal rubber part, to absorb much of the subjected to constant load changes, -Transmission noise perception. crankshaft load pulse. fatiguing the rubber and even, due to It is also highly recommended the the inertia of the auxiliary elements, together with the pulley, the 3. An external part with big can cause instant slips, wearing it replacement of the belt, and the rest inertia, with the channels for the belt. quickly. of associated elements, as tensioners, bearings, etc. accordingly to the Grupo Cautex - May 2016 1 Types of Damper Pulley 1. Damper pulley, vibrations absorber: Composed of 2 elements, a mass to All the Cautex pulleys are support the vibration acceleration and manufactured accordingly an energy dissipation element to absorb to the quality standards the vibration. Besides, the energy transferred from the required by the vehicle piston to the crankshaft can cause up to manufacturer. 2 degrees of deviation on itself, and transfer this deviation to all the elements of the engine where an adequate “The damper pulley helps synchronization is required, as the valve to absorb the crankshaft opening, synchronization of the vibrations”. camshaft, ignition timing, etc. “Avoid mounting solid 2. Damper pulley, vibrations shock- pulleys (not damper) on torsional isolator: your vehicle”. “Check regularly the The high pressures derived of the combustion and low speed of working status of the crankshaft pulley”. together with high moments of inertia of the auxiliary elements increase the problems in the belt transmission. This is Cautex has a wide why these types of pulleys are used, that by the inner soft elastomer, isolate the range of crankshaft belt from the crankshaft vibrations, pulleys. Do not hesitate increasing the lifetime of the belt and the to check our product auxiliary elements. range in our website or our catalogue. 3. Damper pulley, viscous torsional absorber: Cautex guarantees all The purpose of these kind of pulleys is to the pulleys, taking reduce at maximum the influence of the torsional vibrations developed in the charge of the repair if crankshaft, so that the tensions of the the fault is due to poor material derived of these conditions pulley. remain within permissible limits. In this case, inside the pulley we found a viscous liquid in addition to the rubber elastomer. Phone: +34 93 422 53 00 Fax: +34 93 685 13 69 Email: [email protected] 2 Web: www.cautex.com Grupo Cautex – May 2016 2 .