SKF Timing Belt Kits - SKF.com

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Typical timing belt installation • Fit new idler pulley (3), and/or new tensioning pulley (2), in disengaged position, as necessary. (Refer to Fig. 3) • Fit new timing belt (1). Make sure arrows on belt point in correct direction and that any timing marks align with those on sprockets. (Refer to Fig. 3) • Some applications require that the water pump (e) is used to adjust belt tension. (Refer to Fig. 4) • Tighten belt by rotating tensioning pulley (2) or water pump (e). Refer to Fig. 3 & 4. Tighten bolts on tensioning pulley (2) temporarily or water pump (e). • Turn engine clockwise through two full turns (2 x 360º), bringing it back to timing position. Figure 3 The first sign of wear is “noise.” A tensioner that sounds bad usually is bad. While the engine is running, listen by the front of the engine for any noise coming from the tensioner. If there is: • Check for pulley bearing failure, which accounts for about half of all tensioner failures. • Misalignment can also cause the belt to wear unevenly and fail early. 82 • Check alignment of all timing marks, timing holes (fit timing pins) and the like. • Fit belt tension tester and check that tension matches recommended value, then tighten nut of tensioning pulley (2) or bolts of water pump (e) to recommended torque. (Refer to Fig. 3 & 4.) • Refit timing cover. • Clamp flywheel, then refit crankshaft pulley and tighten bolt to recommended torque. • Refit and tighten all belts previously removed. • Refit battery cables. Figure 4 • Check for roughness feel when rotating bearing • Side play (rocking)
Troubleshooting and failure analysis Failure during vehicle operation is a serious matter. To resolve belt failure, determine cause of failure before replacing with a new belt. This will maximize the capability of the belt and extend its life. Also replace timing belt with the same size and tooth profile to avoid engine damage. The following is an introduction to belt failure main causes. Please check the items in this table when failure occurs. For Timing Belts Symptom/Appearance Probable cause Corrective action • Poor alignment ..................................................Adjust the alignment Abnormal side wear • Base not adequately fixed ................................Strengthen the base fixture • Bending of the pulley flange ............................Correct Abnormal wear at tooth surface where • Overload .............................................................Check for correct belt roller profile pressure is being exerted • Overstretched belt.............................................Adjust the initial tension of the belt Abnormal wear at contact point of • Overstretched belt.............................................Adjust the initial tension of the belt pulley area • Defective pulley tooth form .............................Replace with correct pulley paying special attention to the profile of the pulley tooth • Pulley diameter too small ................................Check for correct pulley Tooth damage • 6 teeth or less for T.I.M ....................................Check for correct pulley • Exertion of shock load ......................................Ensure that shock is not exerted on the belt • Overload .............................................................Change the system for proper tensioner adjustment Breaking of tensile body • Drop in elasticity or corrosion of tensile body ........................................................Check the storage condition and condition of the belt • Exertion of shock load ......................................Ensure that shock is not exerted on the belt Crack at the back side • Usage under -30°C (-22°F) ............................Raise the surrounding temperature • Pulley diameter too small ................................Check for correct pulley Thermal aging of rubber / polyurethane • Temperature of 80°C (176°F) and above at the rubber / polyurethane ...............Reduce the surrounding temperature Swelling of the rubber • Oil contamination ..............................................Use polyurethane or oil resistant rubber belt, check for seal leaks and correct • Overload .............................................................Change for proper tension Abnormal wear at pulley tooth • Overstretched belt.............................................Adjust the initial tension of the belt • Pulley life ............................................................Change to a new pulley Wear at pulley edge • Overstretched belt.............................................Change to new pulley and belt while (Tensile body can be seen underneath loosening the tension the belt) • Poor alignment ..................................................Adjust the alignment • Overstretched belt.............................................Adjust the initial tension of the belt Abnormal operation sounds • Overload .............................................................Check the system design • Pulley diameter too small ................................Check the system design • Defective pulley tooth form .............................Ensure that pulley tooth profile is correct 83
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Catalog 457702 2010 SKF Timing Belt
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Belt tensioner unit (TBT) The belt
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How to use this catalog This catalo
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Engine drive systems Technology and
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Engine drive systems Variations of
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Engine drive systems Cooling system
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Engine drive systems Metal idler, w
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Failure analysis overview 90% of en
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Failure analysis overview Tensioner
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Failure analysis overview Water pum
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SKF Timing kits Application install
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SKF Timing kits Application install
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Abbreviation list ABS ............
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Manufacturer to model index Manufac
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Passenger cars, light & medium truc
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Page 35 and 36: Passenger cars, light & medium truc
Page 55 and 56: Timing belt kit contents TBK014P DE
Page 57 and 58: Timing belt kit contents •TBK101P
Page 59 and 60: Timing belt kit contents •TBK145W
Page 61 and 62: Timing belt kit contents •TBK165A
Page 65 and 66: Timing belt kit contents TBK214P DE
Page 79 and 80: Belt performance and quality Timing
Page 81 and 82: Belt specifications SKF No. Width L
Page 83 and 84: Belt specifications SKF No. Width L
Page 85: Timing belt removal and installatio
Page 89 and 90: Analyzing belt wear and damage A br
Page 91 and 92: Troubleshooting and failure analysi
Page 93 and 94: Good practices and helpful hints Ex
Page 95 and 96: Setting up automatic tensioners: a
Page 101 and 102: The Power of Knowledge Engineering
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SKF Timing Belt Kits - SKF.com

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