Auto timing Belt

Auto Timing belt

Certain engines with overhead camshafts have timing belts that have a limited life span. Car makers use these belts instead of more durable chains because chains are noisier and cost more to manufacture.  Your vehicle owner’s manual will recommend at what mileage the timing belt must be replaced.  These intervals range from every 60,000 miles to every 105,000 miles.  To see what is recommended for your engine, click on the link at the bottom of this article.

The job of the timing belt is to turn the camshaft(s) at exactly 1/2 the speed of the crankshaft while maintaining a precise alignment.  This means that the crankshaft will make two revolutions for every revolution of the camshaft.  Engines will have at least one camshaft, or as many as four camshafts in some of the V-type engines.  The camshaft causes the intake and exhaust valves to open and close in time with the pistons which move up and down in the cylinders.  The valves must open and close at exactly the right time in relationship to the piston movement in order for the engine to run properly.  For more information on how this works, go to “A Short Course on Engines

Timing belts fail without warning and on some vehicles, are almost as hard to check as they are to change.  In most cases, your only protection is to change the belt at the recommended intervals. Timing belt replacement is not a cheap job but it is far less costly than the alternative.

There are two types of engines that use timing belts.  They are described as: “Interference Engines” and “Non-interference Engines”  The difference lies in the proximity between the valves and the pistons.  On an interference engine, if the timing belt slips even one notch, the piston can crash into an open valve causing serious engine damage by bending valves and breaking pistons.  Non-interference engines will usually not self destruct, but in either case if the belt fails, the engine will immediately shut down leaving you stranded.  The link at the bottom of this article will tell you which category your engine falls under.

Some technicians may recommend that you replace the water pump during a timing belt job even if there is nothing wrong with it.  This is because 90% of the labor to change the water pump has already been done with the timing belt job and some technicians consider it good insurance to replace the pump at this time.  My feeling is that some water pumps can last the life of the car but many do fail and will cost big money to replace at a later date.  So ask your technician what his experience is with the water pump on your model car and look at how long you plan to keep the car. This way, at least you will be making an informed roll of the dice.

Availability At Umar Farooq Belting
Available : neoprene (CR) and hydrogenated NBR (HNBR) Type Pitch Tooth height Belt thickness Type Pitch Tooth height Belt thickness R(MR) 9.5253.545.69ZR9.5253.205.40>Y(MY)83.115.21ZAS9.5252.324.62ZBS9.5252.805.10ZB9.5252.294.50YU83.1095.20RHD9.5253.505.70RU9.5253.565.70RHX9.5252.6174.80ZA9.5251.914.10RPP9.5252.254.50FS8M83.055.30SL9.5253.405.50ZD9.5253.505.50    Automotive Timing Belt Mold List (List data adjusted after 6 month)By UFB Sizes Available at Umar Farooq BeltingTypeTooth No.R(MR) 58 68 70 78 89 92 93 94 95 96 97 98 99 101 102 103 104 105 106 107 108 109 110 111 112 113 114 117 123 124 125 127 129 130 133 134 136 147 148 149 150 151 153 157 158 177Y(MY)99 100 101 103 106 107 111 112 117 113 121 123 124 127 128 129 131 137 142 143 144 145 146 159 169 177 178 191 211ZBS55 63 65 69 76 83 87 91 92 101 112 117 119 120 122 123 130 134 136 137 141 142 143 149 163YU61 65 76 80 83 99 100 101 103 104 105 106 107 109 110 111 112 113 115 117 121 123 125 130 131 132 133 135 140 141 142 145 146 147 153 154 155 156 159 162 164 165 168 173 177 179 187 191 193 195 197 201 207 210 211 219 223 226 228 232 234 251 257 259 265 281RU58 59 70 72 76 79 83 85 88 89 91 92 93 95 97 98 100 101 103 104 105 106 107 108 109 110 111 112 113 114 116 117 118 119 120 122 123 124 125 126 127 130 131 132 133 134 135 136 145 149 151 152 153 154 157 158 163 176 177ZA54 55 63 69 76 83 84 85 87 88 89 90 91 92 93 94 95 98 102 103 104 106 108 109 110 111 115 116 117 120 121 122 123 124 126 127 133 139 142 144 146S8M65 66 70 73 75 79 80 82 85 89 90 91 95 100 103 105 106 109 110 112 118 120 122 123 125 129 130 132 137 138 140 141 142 144 145 146 148 149 150 151 152 156 160 162 163 164 165 168 169 170 171 173 175 179 180 191 192 200 206 209 210 212 216 220 225 239 250 250 253Also Available: R(MR) Y(MY) RU YU ZA ZB ZC ZD ZAS RHD SHX SRP
on Umar Farooq Belting

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