Probable Cause: Foreign body ingress, which may also cause the belt to dislodge. The presence of marks on the flat side of the belt is additional evidence of a foreign body.
External manifestation of malfunction / breakdown / problem: Noise when rotating the intermediate roller.
Probable Cause: Belt misalignment on pulley or excessive belt tension. With increased radial clearance in the bearing, the inner ring touches the roller, which causes noise.
External manifestation of a malfunction / breakdown / problem: Breakage of the belt tension indicator.
Probable Cause: Indicator failure due to improper belt tension. Incorrect tightening torque of the tensioner mounting bolts or installation of the tensioner on a very hot or cold engine, resulting in incorrect adjustment.
External manifestation of a malfunction / breakdown / problem: Melting of the plastic roller.
Probable Cause: Melting of the plastic part of the roller is caused by working at high temperatures. Overheating of the roller could occur due to bearing failure.
External manifestation of malfunction / breakdown / problem: Traces of wear from rotation in the area of the eccentric.
Probable cause: The presence of wear marks on the mating surface of the bracket indicates inappropriate tightening of the roller mounting bolts.
External manifestation of a malfunction / breakdown / problem: Displacement (skew) roller.
Probable Cause: A belt mark on the pulley indicates improper alignment of the belt and pulley during installation.
External manifestation of a malfunction / breakdown / problem: Damage to the tensioner cover.
Probable cause: Improper installation of the tensioner caused the tension indicator to contact the limiter, resulting in damage to the tensioner housing.
External manifestation of a malfunction / breakdown / problem: Bearing jamming.
Probable cause: Incorrect installation of the tensioner on the engine led to the bearing jamming between the mounting bracket and the flare of the bearing due to their deformation from contact with the locating pin.
External manifestation of a malfunction / breakdown / problem: Breakage of the metal disk of the tension indicator.
Probable Cause: There are four possible causes for this damage: incorrect tensioner installation; installing a tensioner on a very hot or cold engine; inappropriate tightening torque of the tensioner mounting bolt; incorrect gear shifting by the car owner. The presence of a contact patch on the tensioner limiter indicates incorrect installation.
External manifestation of a malfunction / breakdown / problem: Breakdown of the limiter.
Probable Cause: Excessive belt tension, most likely due to installing the kit on a hot engine. In this case, the tension indicator lever is located next to the limiter. As a result of impact with a hammer, the limiter broke. It is also possible for a foreign body to get into the timing drive system, which caused an increased load on the bearing with subsequent breakdown of the limiter.
External manifestation of a malfunction / breakdown / problem: Breakdown of the tensioner: dents on the breakaway part.
Probable Cause: Dents on the surface of the tensioner in the area of the breakage indicate the use of an improper tool and impact during installation, which caused part of it to break off.
When installing and adjusting the tensioner, you must use the proper tool and follow the vehicle maintenance instructions.
External manifestation of a malfunction / breakdown / problem: The presence of oil on the belt and gum on the guide roller.
Probable Cause: The roller seal is contaminated with belt residue adhering to it. The source of damage to the bearing is not the roller, but the belt, as evidenced by the damaged outer (flat) side of the belt. The cause of the damage is a gasoline or oil leak that corrodes rubber components such as the roller seal and belt. Also, the cause of damage can be: a foreign body, incorrect belt tension or misalignment.
External manifestation of a malfunction / breakdown / problem: Bearing jamming; tensioner corrosion.
Probable cause: Spread of tensioner corrosion to the bearing, causing it to jam and the belt to slip on the roller.
External manifestation of a malfunction / breakdown / problem: Hollows on the end face of the working surface of the roller.
Probable cause: Damage caused by a screwdriver during installation. The roller should not be installed after it has been dropped on the floor. Sometimes a mechanic tries to repair the damage from a dropped roller with a hammer or screwdriver. Similarly, firstly, internal damage to the roller cannot be repaired, and secondly, the use of a hammer can damage other components of the system.
External manifestation of a malfunction / breakdown / problem: Turning the guide roller.
Probable cause: Traces of friction on the bearing surface of the tensioner. Tensioner failure is caused by over-tensioning the belt or hitting the aluminum pointer against the limiter.
External manifestation of a malfunction / breakdown / problem: Belt wear from contact with the tensioner roller; displacement of halves of the roller pulley.
Probable cause: The failure of the tensioner, in particular, the roller, is due to excessive tension on the timing belt or inaccuracy in its location relative to the roller. Wear on the flat side of the belt indicates excessive tension, and damage to one of the edges of the belt indicates an inaccurate position.
External manifestation of a malfunction / breakdown / problem: Deformation of the retainer of the supporting part of the roller.
Probable Cause: There are four possible causes of this damage: Incorrect torque of the mounting bolt, the retainer was not installed in the groove during installation, incorrect belt tension, installation of the idler on a hot engine. In the latter case, it is extremely difficult to correctly adjust the belt tension, since the components of the drive system are made of different materials and have correspondingly different coefficients of thermal expansion. The retainer of the supporting part of the tension roller must be securely installed in the groove when mounting the roller
External manifestation of a malfunction / breakdown / problem: Weak belt tension.
Probable cause: Damage to the eccentric by the threaded part of the mounting bolt. Improper tightening of the tensioner pulley mounting bolt resulted in damage to the eccentric with subsequent weakening of the belt tension.
External manifestation of a malfunction / breakdown / problem: The presence of belt fibers on the roller.
Probable Cause: Improper roller alignment or damaged camshaft gear and/or crankshaft.
External manifestation of a malfunction / breakdown / problem: Traces on the roller cover from contact with the belt.
Probable cause: Inaccurate positioning of the roller belt.
External manifestation of a malfunction / breakdown / problem: Belt displacement.
Probable cause: Incorrect alignment of the rollers and belt or damage to the camshaft and / or crankshaft gear.
External manifestation of a malfunction / breakdown / problem: Damage to the roller.
Probable Cause: Over-tensioning the belt causes the drive system components to misalign, causing the latches to break and, as a result, the two parts of the tensioner roller to separate.