SKF Timing Belt Kits Technical Overview
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Catalog 457702 2010 SKF Timing Belt Kits Technical overview In today’s modern automotive engines, there has been a quiet revolution. The need to run more auxiliary equipment such as water pumps or injection pumps, combined with efficiency demands and noise reduction, has caused new timing belt and tensioner systems to be developed. At first, tensioners were of a fixed nature, usually of metal design. They were simple to install: just set tension and tighten. Today, tensioners more likely include an internal spring or external damper, and non-metallic components are becoming more common. This illustration provides an overview of a modern timing belt and tensioner system. Engine-front wheel drive Belt Camshaft pulley tensioner unit Timing belt Injection pump pulley Water pump pulley Idler pulley Crankshaft The crankshaft drives the camshaft(s) and actuates the valves via a belt or a chain. Due to its advantages compared with those of a chain, namely reduced space, as well as lighter and quieter running, the timing belt is widely used by many car manufacturers. Belt tensioner unit (TBT) Idler pulley The belt tensioner unit sets the right tension and provides guidance for the belt. The idler pulley is fixed and allows the belt to be correctly wound around the driven component. The adjustment of tension during mounting is achieved by means of an eccentric Main designs currently used are shown here: or by means of a spring acting against a rear plate. The automatic belt tensioner unit, with its built-in spring and friction system, maintains a constant tension of the belt while the engine is running. Main designs currently used are shown here: Automatic TBT Belt tensioner pulley (TBP) SKF belt tensioner pulleys for timing system are based on state- Belt tensioner unit (TBT) of-the-art technology. The years of experience accumulated by with an eccentric adjustment SKF in the design and supply of belt tensioner pulleys to the world’s automotive manufacturers provides assurance of high quality and performance of each belt tensioner unit included in the SKF product range. Timing belt Timing belts offer numerous advantages over chain and gear drives: greater efficiency, reduced weight, quieter operation and fuel savings. Automatic TBT with a built-in spring and friction system. Stable, high tensile strength synthetic cords resist shrinking and stretching. Timing belt construction Tensile cords—High tensile strength fiberglass or aramid cords resist stretching and shrinking. Material reliability in tough engine environments. Facing—Wear resistant fabric protects the tooth surface and keeps frictional loss at a minimum. Timing belt tensioner (TBT) with rear plate Idler pulley The idler pulley is fixed and allows the belt to be correctly wound around the driven component. Main designs currently used are shown here: Idler pulley Idler pulley with rear plate Belt tensioner pulley (TBP) SKF belt tensioner pulleys for timing system are based on state- of-the-art technology. The years of experience accumulated by SKF in the design and supply of belt tensioner pulleys to the world’s automotive manufacturers provides assurance of high quality and performance of each belt tensioner unit included in the SKF product range. TBP with a rear plate Timing belt Timing belts offer numerous advantages over chain and gear drives: greater efficiency, reduced weight, quieter operation and fuel savings. Stable, high tensile strength synthetic cords resist shrinking and stretching. Tensile members Timing belt construction Rubber backing Tensile cords—High tensile strength fiberglass or aramid cords resist stretching and shrinking. Material—Durability, performance and reliability in tough engine environments. Facing—Wear resistant fabric protects the tooth surface and keeps Timing belt frictional loss at a minimum. Rubber tooth Tooth facing How to use this catalog This catalog has been divided into three sections: Applications, Information and Reference 1.) Refer to the table of contents for page number of section that is desired. 2.) How to use timing belt kit application section Simply locate 1 Manufacturer (manufacturer's are located in alphabetical order-refer to manufacturers index) and model, 2 locate year and message, 3 locate your application information and once application has been found, 4 ind the SKF kit number. (See below) 1 Honda Truck Passport, Ridgeline Engine Engine (Cont.) Timing Belt and Tensioner Kit Timing Belt and Tensioner Kit (Cont.) 2006 Ridgeline w/3.5L Eng.: 1996-1994 Passport w/2.6L Eng.: Belt & Tensioner Kit w/Water Pump ..................... t TBK329WP Belt & Tensioner Kit w/Seals .................................... t TBK147P 2002-1998 Passport w/3.2L Eng.: Belt & Tensioner Kit w/Water Pump ..................... t TBK303WP 1997-1994 Passport w/3.2L Eng.: 2 Belt & Tensioner Kit w/Water Pump ..................... t TBK221WP 3 4 t Interference engine for most applications. 3.) Included for your information are: Engine drive system-overview, kit contents, installation information and frequently asked questions. 4) For your reference included are: belt speciications, troubleshooting and failure analysis, good practices and helpful hints and a kit reference buyer's guide. Note: Part numbers with WP sufix (ex: TBK221WP) indicate kit contains a premium water pump plus camshaft and timing cover seals along with belt(s), tensioners, idlers and detailed instruction sheets. (See kit product box image below on right side) Part number with P sufix (ex: TBK147P) indicate kit contains camshaft and timing cover seals plus belt(s), tensioners, idlers and detailed instruction sheets. (See kit product box image below on left side) 1 Table of contents Applications Manufacturers model index .......................................................................................... 22 Passenger car and light truck........................................................................................ 24 Information Engine drive systems ........................................................................................................3 Failure analysis overview ............................................................................................... 11 Chrysler application installation information .............................................................. 17 Cadillac, Saab and Saturn application installation information ............................... 19 Ford & Mercury application installation information ................................................. 20 Abbreviation list .............................................................................................................. 21 Kit contents ...................................................................................................................... 51 Frequently asked questions ........................................................................................... 74 Reference Belt performance and quality ....................................................................................... 75 Belt speciications ........................................................................................................... 76 Timing belt removal and installation............................................................................ 81 Typical timing belt installation ....................................................................................... 82 Troubleshooting and failure analysis for timing belts ................................................ 83 Belt life vs correct tension ............................................................................................. 84 Analyzing belt wear and damage ................................................................................. 85 Troubleshooting and failure analysis for all other components ............................... 86 Good practices and helpful hints .................................................................................. 89 Setting up automatic tensioners: a typical example .................................................. 90 Kit reference buyer's guide ............................................................................................ 92 2 Engine drive systems Technology and material changes Many components and systems in the engine depend on the correct functioning of the timing and auxiliary drives. This is also driving the technology and design of these systems, so they can live up to the more demanding criteria required. Timing drive system The controlled operation of this system is dependant on either a chain or a belt. A general drive for design improvement for performance gain, coupled with the pressure to reduce emissions, have seen twin overhead cam, multi-valve engines become commonplace. Timing belt Timing system, belts vs. chains A timing belt is typically rubber with high-tensile ibers For car manufacturers, engine assembly is all about (e.g. iberglass or Kevlar) running the length of the numbers built – faster. Unfortunately, the time taken belt. Rubber degrades with higher temperatures and for the ABTU and belt on the timing system to be set up contact with motor oil and antifreeze. Therefore, the life correctly, can eat into production time. Chains are easier expectancy of a timing belt is lowered in hot or leaky and faster to install. This fact contributes to the use of engines. While older belts were of chlorobutadiene chains today. The use of high performance material such rubber material and trapezoidal shape, today’s modern as HSN, advanced automatic