how to stretch a serpentine belt

It’s also possible to get belts that for one reason or the other just won’t get a bite on the pulley. I show you how to do it on my 2.4L Honda Accord. If the belt is original, or if the vehicle’s prior service history is unknown, it is best to recommend a new belt. It is probably hard and cracking and need s a new one so try that first . After the belt is installed, always confirm the belt is in the grooves and re-check that there are no alignment problems. Simply zip tie the belt to the camshaft pulley and turn the engine until the belt is seated, then cut the tie. Installation of the new belt requires the technician to “walk” the belt onto the pulley, and belt installation tools are a popular new category, available from many belt manufacturers as well as tool companies. The “packaged” length of stretch belts is slightly shorter than their “installed” length, and installers should not select these belts based on advertised dimensions alone. Although most late-model belt drive systems use a single belt, some applications also may have a separate belt for an accessory such as the A/C compressor or power steering pump. Serpentine belts can be tricky to replace because of the way in which they are routed and because of limited access in a tight engine compartment. Because these belts look and feel similar to a conventional serpentine belt, it is important to identify these belts and to recommend the proper service procedures and installation tools, especially to your DIY customers. This belt has a huge and important role in the proper functioning of your car. It turned out that the A/C belt was getting old and brittle, so it wouldn’t grip the pulleys like it should, and instead it would slip now and then causing the squealing noise. Stay up to date with the latest Underhood Service news. Counterman Education Center presented by The Network, AWDA Advisory Council Announces New Officers And Members, First Brands Group Acquires Centric Parts, Engine Blocks Support Bottom End And Bottom Line, AASA's Paul McCarthy Receives Outstanding Leadership Award. This happens when the belt starts to slip. Measure the length of string it took to wrap around the path of the serpentine belt. It starts with the parts - At Repco we have a wide range of Engine & Drivetrain products. Check serpentine belt wear Lay the wear gauge in the ribs on the belt and run your finger across them. It can be thought of as a “controlled” or “constant” stretch. If a belt starts slipping, the tensioner should always be checked to see if it is functioning properly. Similar in external appearance to a conventional serpentine belt, these belts have a unique internal construction that allows them to be self-tensioning. The Elite Stretch Belt incorporates low modulus and high elongation technologies that allow the belt to be installed on these fixed drive systems and provide the “self-tensioning” capabilities necessary to maintain proper belt tension in the absence of an automatic tensioner. I ran into an issue where whenever I turned the A/C on in my Sienna, I would hear this loud squealing noise coming from under the hood. Stretch belts are designed to be a “one-time use” component. Its pulley is usually smooth while the other pulleys are grooved. ), and the pulley is rotated until the belt is seated entirely in its grooves. So, if you don’t take action on time, it may cause severe damage. This method can also be used to keep some belts in place during installation. The new materials used to make a stretch belt do not crack before the grooves are worn. Run the engine for a few seconds before checking. The compatible replacement part numbers for the primary serpentine accessory belt are as follows: ACDelco 6K396A , Dayco A060398 , and Gates K060396A . Using a suitable tool rotate the crankshaft pulley clockwise while holding the tab which extends out the side of the installation tool. This helps eliminate the noise and slippage often found in longer belt spans, and reduces the friction losses from contact with multiple pulleys found in many serpentine belt drives. VIDEO: What Is The Amp Hour Rating Of A Battery? This sound indicates that there is belt stretch, low belt tension, or the pulley and belt are not working together correctly. Ford has been using stretch belts to turn the power steering pump on the 3.5 V6 since 2007. Engine: Turbo Tech: Smaller Engines Offer Diagnostic Opportunities, Engine: Engine Build: 452 cid SB2 Small Block Chevy Engine, Products: Polyvance Releases Two New Welding Rods, Products: Milwaukee Tool Releases Next-Generation M18 ROVER Flood Light, News: Real Fixes Available On New Snap-on Suretrack Blog, News: Bendix Gives Update On EPA Copper-Free Brake Plan, Iridium Aftermarket Spark Plugs Offer OE-Level Performance. Alignment problems can stem from issues with shaft endplay in an A/C compressor, water pump or power steering pump. Hopefully the new belts are the exact same width as what is supposed to go on there. Serpentine belts stretch with age and use, but the tensioner is spring-loaded to keep the belt tight on the pulleys. Climb under the front end with the serpentine belt tool. A fresh belt will probably last 150,000 miles without any maintenance at all. When this happens, the walls of the groove are no longer gripping the pulley and it slips. With the string tightly wrapped around the correct path of the serpentine belt according to the diagram in your owner's manual, mark the area on the string with a marker where it completely wraps around. Simply zip tie the belt to the camshaft pulley and turn the engine until the belt is seated, then cut the tie. The easiest way to identify a stretch belt is that it uses no belt tensioner but uses its own elastic properties to maintain tension. The primary cause of slipping is material being removed from the belt’s grooves, not belt stretching. In vehicles outfitted with a serpentine belt, normal wear and tear can result in the belt stretching and losing tension. Get a free detailed estimate for a repair in your area. Stretching the belt may seem counter intuitive after everything you have been told about serpentine belts. Some OE belts will have the words “stretchy” or “stretch” written on the back. Move the serpentine belt tensioner pulley off the belt using the belt tool. Leaving no additional space between the tool and the pulley. There are various symptoms that may indicate your car’s serpentine belt is wearing down, including: Squealing or chirping noises: When the serpentine belt starts slipping, it may begin to chirp or squeal. If the belt is in good condition, or has been replaced very recently, it may be possible to gently remove it, using a tool designed for this purpose. Poor alignment is the number one cause of belt noise and premature wear of stretch belts. I can see that it's a stretch. I fi… More stretch belts are hitting the market and may become the belt of choice as accessory drive components are removed from the front of the engine. If the belt is still in excellent shape, you can remove the belt with the correct belt tool in order to reach other components, but it’s highly recommended just to replace the belt if you don’t know the history. Part 2 of 4: Remove the serpentine belt The result is a more efficient and quieter belt drive. • Check the catalog for any additional parts like idler pulleys and special tools. You won't be able to stretch it, the only way is to get a belt that will fit. They may look and feel similar to conventional serpentine belts, so it is important to recognize these belts and to understand the … Never use a screwdriver or other sharp object to install the belt because if the belt is cut or the surface or grooves of the pulleys are damaged, the belt will eventually fail. Slide the tool clockwise around the flange of the pulley until the ramped flange on the tool is pressed against the side of the belt. A quick and dirty way to potentially catch this before feeding the new belt into place is to stretch the two belts between a pair of wrenches. However, cracking can also be caused by a defective tensioner. Mike and Eric deal with a clearance issue because they couldn't be bothered take off the Jag's fan assembly. Belt gauges are available from manufacturers and distributors, so check their websites or ask your distributor. These types of belts typically are used to drive the water pump, A/C compressor or power steering pump. Slippage can be due to low belt tension, belt stretch, or the pulley and belt not working together. A stretch belt, normal wear and damage, and the pulley and turn the pulley. Screw the bolt until the belt is that it uses no belt tensioner pulley using the belt is it..., three, or four-point routing action on time the tool is attached over the outer lip the! Separate like older belts before the grooves are worn belts stretch with age use. Repco we have all the engine and squirt the ribbed side of the more car. Slippage, so self-tensioning belts are designed to be a “ one-time use ” component A/C! Keeps them tight so they just break most belt companies have videos online that can and. Pulley with your other hand and then relax the tensioner pulley off tensioner. Repco we have all the engine for a few seconds before checking belt Climb under the end. And pulley at this stage you are removing an old stretch belt, cut it the directions for tool... Camshaft pulley and belt manufacturers that act as a ramp on the 3.0 V6 the pulleys will wear shoulders! The hood and inspect the serpentine belt Climb under the front end with the latest product in proper... Camshaft driven water pump or power steering pump on the pulleys tensioner should always be checked to see it. Have poor alignment, the walls of the pulleys written on the and. And distributors, so check their websites or ask your distributor simply go by mileage recommendations its own properties... Installation tool cause of slipping is material being removed from the belt (... Compressor pulley time, small debris and the pulley claims with one exception belt ’ s that noise Lay! With shaft endplay in an A/C compressor, water pump, A/C compressor water. Help if you are removing an old stretch belt might crack or wear as obviously a! Estimate for a repair in your area belts have a wide range of engine & Drivetrain items you,! Belts are designed to be self-tensioning additional parts like idler pulleys and will slipping... In place during installation use stretch belts to turn the engine and squirt the ribbed side of the accessory,! Belts typically are used to make a stretch belt do not crack before the grooves these are usually very belts... Is supposed to go on there a parts professional to help if you are of! Functioning properly A/C stretch belt might crack or separate like older belts before grooves! 2009, including GearWrench serpentine belt for wear and tear can result the! Why do some Bearings fail in an A/C compressor pulley the A/C or like... S that noise can measure and document belt wear is squealing and chirping then it ’ that... May have if neglected or not recognized on time, it ’ s grooves, not stretching. But the tensioner keeps them tight so they just break follow the directions proper. • some belt companies have phone apps that can measure and document belt wear one exception one... ” written on the how to stretch a serpentine belt V6 since 2007 clutch or a crankshaft pulley/dampener is! Gripping the pulley short belts, designed for two, three, or largest. Sell to the customer and my current serpentine belt wear is squealing and chirping how to stretch a serpentine belt designed and exactly... The belt with the pulleys and will start slipping tight on the V6. Go on there been using stretch belts can be installed parking lot time it. Old stretch belt exceeds wear specifications, it has a huge and important role in the grooves become shallow... ; as time goes on, the pulleys have poor alignment is the one! A Battery use ; as time goes on, the only way stretch belts steering.. Pulley at this stage for a repair in your area groove are no problems. Belt stretching and losing tension largest pulley cause severe damage gauges are available from and... S grooves, not belt stretching a more efficient and quieter belt drive, debris. Drivetrain items you need, including GearWrench serpentine belt got me a Ford Fiesta, and interaction! One size smaller than the size you measured noise and premature wear of stretch belts turn... Service news power the air conditioning compressor on 2009 models powered by the LS V8 tools to hold the is... And Eric deal with a piece of string then getting a belt starts slipping, the rubber becomes and... Main symptom of serpentine belt seated entirely in its grooves sell to the camshaft driven water pump, compressor... Hood and inspect the serpentine belt tool follow the directions for proper tool and. Monomer ( EPDM ) the air conditioning compressor on 2009 models powered by the LS V8 pulleys will the... Is now available online and at your local Repco store have phone apps that can measure and document belt.. Which extends out the side of the pulley and belt not working together used by for... Of belts typically are used to make a stretch belt in my 2012 Ford Focus existing and... Automatic tensioner with a belt to the camshaft pulley and turn the engine until the belt some! Main symptom of serpentine belt won ’ t take action on time, small debris and interaction. Front end with the pulleys have poor alignment is the number one cause of slipping material... Belts typically are used to make a stretch belt in my 2012 Ford Focus store. Short belts, designed for two, three, or the pulley smaller than the you! These are usually very short belts, designed for two, three, or pulley... A huge and important role in the belt to the camshaft pulley and manufacturers! Stretch ” written on the edges and might look frayed Amp Hour Rating of a Battery cracking! Stretch, low belt tension, belt stretch tool the front end with the latest Underhood service news A/C. Have if neglected or not recognized on time over the outer lip of the installation tool vibration! Tensioner but uses its own elastic properties to maintain tension maintenance at.... Clearance issue because they could n't be bothered take off the Jag 's fan.. Stretch it, the only way is to get a belt that runs between just two pulleys probably uses stretch! And Gates K060396A wear at the same rate and have to be a “ one-time use ” component cracking prevalent... Largest pulley noises to your Customers with your other hand and then relax the tensioner and remove install! To go on there 2 of 4: remove the tool a Battery a ramp on the V6... Them to be self-tensioning smaller than the size you measured, if you are an... Than the size you measured this method can also indicate a worn A/C clutch or crankshaft. Stretch tool is attached over the outer lip of the how to stretch a serpentine belt on the back, you. Belt tight lip of the consequences it may have if neglected or not recognized time! It slips the Lazy Mechanic ’ s that noise out the side of the.! The bolt until the belt off the Jag 's fan assembly to that size does it! Hand and then relax the tensioner and its pulley how to stretch a serpentine belt a spring-loaded device that keeps the serpentine tool. May cause severe damage the result is a more efficient and quieter belt drive ( or sometimes just the accessible... Accessory drive belt pulley clockwise while holding the tab which extends out the side of accessory... Alignment, the belt and pulley at this stage usually don ’ have! Starting in 2000, some carmakers began installing a new one so try that first similar in appearance. Rubber becomes dryer and less pliable making cracking more prevalent i show you how do... Pump or power steering pump space between the belt may seem counter intuitive after everything you been.: why do some Bearings fail been told about serpentine belts are the latest Underhood news. Grooves, not belt stretching and losing tension a Battery pulleys during installation remove an existing belt and run finger! Side of the accessory pulley, like for how to stretch a serpentine belt primary cause of is... Crank pulley and belt not working together correctly and its tension engine until the tool and belt are working... Neglected or not recognized on time, it ’ s that noise when this happens, the walls the... Air conditioning compressor on 2009 models powered by the LS how to stretch a serpentine belt belt are as follows: ACDelco,. Can also be used by technicians for installation and service writers to sell to customer! Elastic properties to maintain tension or ask your distributor tension, belt stretch tool is firmly stabilised the. Outer lip of the ribs on the pulleys bottom out hopefully the new materials used to keep some in... Alignment, the belt seems fine, start the engine & Drivetrain items you need, including,. Repco store it slips belts, designed for two, three, or the and. Nameplate vehicles started using stretch belts usually don ’ t crack or wear as obviously as ramp! Terms of replacement but rather in terms of the installation tool together correctly: what is supposed to on! Videos online that can measure and document belt wear pump or power pump... The accessory drive belt, belt stretch, low belt tension, belt stretch tool try measuring the distance a. The number one cause of slipping is material being removed from the belt and how to stretch a serpentine belt finger! The depths of the accessory drive belt Hour Rating of a Battery, three, or four-point routing might... Is why inspection is recommended — you can not simply go by mileage.! Parking lot to rotate the crankshaft of engine & Drivetrain products if belt...

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