This toothed rubber and fabric belt is responsible for. Timing belt tensioning treadclimber in case the tension on the timing belts is too loose or tight, please follow these instructions. High power drives paper making machinery pumps and compressors roll table drives linear and synchronous conveyors example. The consequences of improper belt tensioning are costly. Position large oring on the tester scale at this measured length.
The two main shafts of engine, the crankshaft and the camshafts are connected and turned together at. The range of a typical tester is up to 35 lb, which takes care of vbelt and synchronous belt drives in lower horsepower ranges, up to 100 hp. Belt deflection setting for 2 deflection per 1 of belt span 8m 30 85 075 100 150 40 170 20m l used belt new belt number of teeth small pulley belt width belt tooth profile 20 belt deflection setting. Includes a warranty equal to the oe replacement interval. One of the essential components of cars engine is timing belt. Remove all shrouds underneath the treadles to gain free access to the cable system. Pdf pages of our catalog view or download product sections or the complete catalog. Mptab7i2007r 20 calculation of vbelt tensions and shaft loads mechanical power transmission association 5672 strand court, suite 2, naples, fl 34110. In the past, engines used a manual tensioner or eccentric pulley for the drives, which had to be installed and then locked in place. Handbook of timing belts, pulleys, chains and sprockets. Eng10, camshaft timing belt and balance shaft belt tension checking and adjusting tools jack stands floor jack metric socket set metric wrench set porsche timing belt tension tool p9201. When a belt is installed with a snug but not overly tight fit, longer belt life, less bearing wear and more quiet. Timing belt, tensioner and idler failure know your parts.
A timing belt transmits torque and motion from a driving to a driven pulley of a power transmission drive fig. Professor, 3 head of the department, 4proprietor of omega cnc automation. Consequently, a belt, when installed with a snug fit that is. While on the topic of timing, w e need to understand that there are three types of timing in volv ed here. It covers valuable background for the step by step selection procedure for the belt sizing guide.
Skf belt frequency meter user manual industrial gp. Timing belt driven water pumps should always be replaced when the timing belt is replaced. Do not reuse the timing belt, tensioner or idler if misalignment is found, replace them with new components to avoid engine damage or failure. Its universally recognized that proper synchronous belt tension is key to efficient drive operation. With the timing belt removed, check for side to side play or rocking on both the idler pulley and tensioner pulley. After seating the belts in the groove and adjusting center distance so as to take up slack in the belts, further increase the tension until only a slight bow on the slack side is apparent while the drive is operating under load. Foreword this foreword is provided for informational purposes only and is not to be construed to be part of any technical specification. Pull the spring balance until the edge of the belt is in line with a raised mark on the waterpump intakehose stub. Please refer to oem recommendations about where to place the tension gauge on the belt. The skf belt frequency meter is a two component system consisting of a handheld meter attached to an optical.
In conveyors it may also carry a load placed on its surface fig. Install the tensioning pulley by aligning the locating tab on the back of the tensioner to the relief on the engine fig. Downloadableprintable timing belt identification and replacement. And where newergeneration belts drive loads, proper. Over time, the belt tension would change as there is no adjustment of the tensioner, after the initial installation. Correct vbelt tensioning is the single most important factor necessary for long, satisfactory operation. The two main shafts of engine, the crankshaft and the camshafts are connected and turned together at the right time by this timing belt. Technical manual rubber timing belt drives optibelt. Typesuper torquemegatorque timing belt design manualp217. This action destroys the belts and equipment must be shut down to replace them. During operation, this stress greatly reduces belt life. This warranty does not apply to vehicles or engines used in modified. Belt identification and selection vbelt and synchronous belt installation proper tensioning sheave and sprocket alignment improving drive performance problemsolution guidelines and. If there is damage to a timing belt, gates recommends that these parts be changed as well.
The browning belt tension checker, shown at left, is ideal for this procedure. Tools required phillips screw driver 6mm allen wrench 1. Apply force at right angles to the center of the span see diagram. The basis for a highquality and reliable product is provided by wear resistant. Fit the hook to the belt midway between the camshaft and crankshaft sprockets, at the level of the waterpump intakehose stub. Timing belt replace at 110k miles 175,000 km on audi tts or k miles 205,000 km on audi a3 2. Hence, they do not slip and there is no relative motion between the two elements in mesh. Belt tensioning instructions jason industrial, inc.
The belts positive grip eliminates the need for high initial tension. Aug 25, 1992 while the various features of the tensioner, belt drive system, and method of the invention are perhaps best described with a synchronous belt drive for an automotive engine, many features of the invention may also be used in other belt tensioning applications such as automotive frontend accessory drives. Timing belt installation should be a snug fit, neither too tight nor too loose. In timing belt drives the pulley pitch diameter, d, is larger than the pulley timing belt theory introduction geometric relationships figure 1a. Check the tension at least twice during the first day. Turn the engine to top dead center and check all timing marks. We recommend using the challenge belt tensioning gauge to obtain the correct tension for the drive thus ensuring.
If the tension is too low, vbelts slip and glaze or burn. The main stress line in a trapezoidal tooth timing belt is at the base of the teeth. When the drive is in motion, a slight sag on the slack side is normal. Using the 2hole tensioning tool t10020, rotate the timing belt tensioner counterclockwise until notch 1 and indicator 2 align. Engine timing systems utilize one or more of following components. The intent is to find this proper range for any vbelt drive. Slide the small oring flush with the barrel of the tester. Aug 18, 2017 how to fit the timing belt tensioner, how to tense the belt 1. The positive grip of the belt eliminates the need for high initial tension. Timing belt tension mech minutes misumi usa timing belt installation tension adjustment belt. Mptab7i2007r 20 calculation of v belt tensions and shaft loads mechanical power transmission association 5672 strand court, suite 2, naples, fl 34110. The belts positive grip eliminates the need for high.
When replacing the timing belt, its important that the tensioner, idler pulleys, and water pump are inspected as the timing components wear at a similar rate. The world of timing belts section 1 introduction timing belts are parts of synchronous drives which represent an important category of drives. Belt tension calculator proper belt tension ensures optimum performance of a vehicles accessory belt drive system. Apply the appropriate belt tension as specified in the relevant catalog and design. For convenience, the gauge can be read from the front or back. Timing belts guarantee absolutely synchronous power transmission since a positivefit connection. The proper tension for operating a vbelt drive is the lowest tension at which the belts will not slip at peak load conditions. Manufacturers recommend replacing the timing components when replacing the timing belt. Slacken the single nut in the slot of the tensioning assembly. Remove all rags and clamps, remove the flywheel lock, and temporarily install the crank pulley. Low tension allows the belt teeth to ride up on the sprocket teeth. The correct timing belt tension is the lowest tension at which timing belts will transmit the required mechanical power and not ratchet teeth when the drive is under a full load. While a taut string or timing belt can stand a strong pull. This set include all the tools useful for locking camshafts, crankshaft, tensioners, pulleys, etc.
Optibelt technical manual rubber timing belt drives. Vw type a4 timing belt replacement procedure writeup. The belt and the pulley may be extremely hot after the operation. Instruction manual for timing belt replacement complete set of tools suitable for timing on peugeotcitroen, ford petrol and diesel engines. Skf belt frequency meter user manual user manual box edition. Water pumps are designed and built for long lasting, efficient cooling. Without exception, the most important factor in the successful operation of a v belt drive is proper belt tensioning. Select from the dropdown options below to find the appropriate belt tension for your belt. It is important that the belt and bearing alignment is correct. To achieve the long, troublefree service associated with v belt drives, belt tension must be sufficient to overcome slipping under maximum peak load. Note when checking timing belt tension, the timing belt tool is installed such that the gauge on the tool is oriented upside down. They may also convey a load placed on the belt surface. The effects of low tension on a synchronous belt are equally bad.
Timing belt tensioning tool schwaben es2222281 r 3 adjust the gauge. Belt deflection setting for 2 deflection per 1 of belt span 8m 30 85 075 100 150 40 170 20m l used belt new belt number of teeth small pulley belt width belt tooth profile 20 belt deflection setting for 164 deflection per 1 of belt span h 075 100 5m 9 15 25 050 14m deflection settings table for tensioning timing belt drives. Making light work of belt tensioning machine design. How to check a faulty timing belt tensioner yourmechanic advice. On drives using a low installation tension, small pulleys, and light loads, the backlash of the. Sophisticated force measuring gauges are available with fullscale. It also requires the flat bars on the tool to slide between the timing belt and the timing belt cover which is a snug fit. Consequently, a belt, when installed with a snug fit that is, not too taut assures longer life, less bearing wear and quieter operation. Power transmission installation and maintenance optibelt. The belt s positive grip eliminates the need for high initial tension. When changing a timing belt, you are doing more than just replacing an old. The belt should be pulled tight between the cam and crank on. Tensioners and idlers are important components that work handinhand with the timing belt. For applications in other pulleys, please contact the optibelt application engineering department.
We had a really great conversation on the hvac school facebook group about some belt tension best practices and it turns out that even a lot of really smart and experienced techs are not. Belt tension values should follow optibelt recommendations. For applications in other pulleys, please consult the optibelt application engineering department. Recommended drive brecoflex at20 timing belt and timing. These few timing components are inexpensive when compared to labor costs. Reinstall the tensioner arm and tensioner, and run the tensioner bolt up to snug the belt. Characteristically, these drives employ the positive engagement of two sets of meshing teeth. The 928 timing belt and tensioner system wally plumley 928 specialists the toothed camshaft drive belt, more commonly referred to as the timing belt, and its tensioner, make up one of the most critical of the 928s subsystems. Vbelt tensioning adjustment can be made using a tensionmeter or other type spring scale, using the following procedure. Belt tensioning when installing the belt on the cam, crank, and water pump sprockets, make sure all of the belt slack is on the tensioner side. Timing belt tensioning tool schwaben es2222281 r 4 with the tension gauge mounted on the belt, read the actual belt deflection on the sliding scale indicator, referred to in the chart as the optimum tension. Proper belt tension is a critical step when installing a belt. Then, tighten the timing belt tensioner nut to 15 ft. While the various features of the tensioner, belt drive system, and method of the invention are perhaps best described with a synchronous belt drive for an automotive engine, many features of.
High power drives paper making machinery pumps and compressors roll table drives linear and synchronous. V belt tensioning adjustment can be made using a tensionmeter or other type spring scale, using the following procedure. Belt tensioning method gates power drive products, inc. Screw the micrometerstyle adjustment barrel on the gauge body in or out as needed to dial in the tension setting.
Check condition of timing belt tensioning system, dampening pulleys, and idler pulleys. Timing belts are basically flat belts with a series of evenly spaced teeth on the inside circumference, thereby combining the advantages of the flat belt with the positive grip features of chains and gears. Belt tensioning instructions timing belt htb, standard and metric timing belts should be installed to fit pulleys snugly, neither too tight nor too loose. Formulae are given for the power transmitted by a belt drive and for the tensions in the belt. Check condition of timing belt tensioning system, dampening pulleys, and idler pulleys and replace if necessary brake fluid replace every 2 years regardless of mileage. Belt tensioning instructions engineering information. The 928 timing belt and tensioner system wally plumley 928 specialists the toothed camshaft drive belt, more commonly referred to as the timing belt, and its tensioner, make up one of the most. Our timing component kits with water pump offer the same oe components as our tcks with the addition of a water pump. In the past, engines used a manual tensioner or eccentric pulley for the drives, which had to be installed and then. Bando vbelttiming belt installations all world machinery. When a belt is installed with a snug but not overly tight fit, longer belt life, less bearing wear and more quiet operation. Installation timing belt tensioning guide pfeifer industries. There is no slippage or creep as with plain flat belts. When a belt is loose it will slip, causing excess heat.
After seating the belts in the groove and adjusting center distance so as to. Timing belt drives transmit torque and motion from a driving to a driven pulley or force to a linear actuator. Blades contact freedom 42 mower deck m11867 b c m893 a. When tensioning new drive belts, it is important to tension the belt to a specified tension, then after 3 to 5 minutes of engine runin, retension the belt to compensate for the loss of tension due to the belt. Htb, standard and metric timing belts should be installed to fit pulleys snugly, neither too tight nor too loose. Loose timing belt tensioning acts like a looselyheld piece of string, with a snapping action as in a high torque situation the string or timing belt will break because the added stress is more than the timing belt was designed to take. Belt and pulley mesh for inch series and metric tseries, htd and std series geometry. Loosening tensioning idler a less than one full turn or more than one full turn will effect final belt tension. Required belt tension is low, therefore producing very small bearing loads. Place the large end of the tester on one belt, at the center of the span. Inappropriate tension could result in damage of the belt and shaft. Vribbed belts and timing belts can be easily and quickly checked for their tension val ues.
Belt drive systems for both timing and accessory drive can have different tensioning systems. How to fit the timing belt tensioner, how to tense. The balance should read 11 lb 5 kg for a used belt, lb 6 kg for new belt. Incorrect belt tension as well as pulley misalignment adversely affects belt drive reliability and efficiency. Belt life varies greatly depending on not only how the belt is installed, but on how the belt is tensioned at installation. The second most important thing this procedure accomplishes is it totally resets all timing settings on the engine and restores them back to factory new settings. How to fit the timing belt tensioner, how to tense the belt 1. Timing belt tension mech minutes misumi usa timing belt installation tension adjustment belt tension adjustment sonic tension meter timing belt replacement timing. If not, please use a hydraulic jack large enough for the load, and work on a hard, flat, stable surface. Torque, effective tension, tight and slack side tension during operation of belt drive under. The trapezoidal shape timing belt was superseded by a curvilinear tooth profile which exhibited some desirable and superior qualities. This leads to hot bearings and lowered bearing life.
Check the timingbelt tension with a spring balance with an lshaped hook. To install the timing belt, relieve the tension on. Apply force at right angles to the center of the span see diagram below. Timingbelt drives transmit torque and motion from a driving to a driven pulley or force to a linear actuator. After the pulleys have been aligned, it is very important to.