Typically timing belt issues current themselves with no warning. There is no squeak that permits you to know it is time. In case your car ran fantastic and then the motor stopped suddenly with a clunk and won't restart, it is likely your timing belt. The timing on the engine have to be set exactly, or the valves and the pistons might collide, resulting in very costly engine repairs. See this step to be taught extra about exposing and changing your timing belt.
Buying a New Timing Belt
Buy a new belt before proceeding with eradicating the old one.
If this is a upkeep service, it's possible you'll wish to locate a new belt earlier than eradicating the outdated one. If the belt has broken or slipped, you possibly can wait till the outdated one is eliminated earlier than buying a new one so you possibly can evaluate them to make sure the new one is the proper one on your vehicle.
Most vehicles require rubber timing belts, versus older steel timing chains. Available for just a few dollars at any auto components store, you'll seemingly need to alter yours each 90,000 to 120,000 miles, depending on your engine.
Collect the information about your vehicle.
You will have to know the make, mannequin, and year model of the automobile, in addition to the engine type and size. Some models could have variations even throughout one model year, so your VIN might also be helpful. You should purchase an new belt at a dealer or an auto elements store.
Ensure you additionally buy gaskets and gasket adhesives required for reassembly.
Your elements supplier ought to be able to tell you what you'll need. Timing belt kits are additionally accessible that embody substitute gaskets and different essential supplies to complete the job.
Exposing the Timing Belt
Disconnect the unfavorable battery cable.
Ensure you have got your radio security code (if equipped) any preset radio stations and the time on a bit of paper to allow for fast resetting once repairs are made.
Remove the alternator belt.
Depending in your mannequin, you could have to take away the serpentine belt to get to the timing belt. Loosen the nuts, pushing the alternator if essential to create slack on the belt and remove it.
Remove any accessories such as the facility steering pump, alternator, and air-con compressor so you possibly can entry the timing belt cover.
Don't remove pressurized fittings from the air conditioning compressor, most can be unbolted and pushed out of the best way with out discharging the system.
Take away the distributor cap in case your vehicle is provided with one.
You could need to pry apart the retaining clips to free the distributor cap, as well as remove any screws holding the cap in place.
Some fashionable vehicles with electronic ignitions do not have distributors. They may have a cam and crankshaft position sensor instead. The important thing is to be able to determine Prime Useless Heart (TDC) on the primary cylinder. Consult the engine restore manual, since these will differ by model.
Line up the timing marks.
Using a wrench or socket on the crankshaft bolt rotate the engine until the timing mark on the crankshaft pulley is aligned with the zero° mark on the timing scale.
Confirm the distributor rotor is aligned with the index mark on the distributor housing indicating the rotor is in place to fireplace the primary cylinder. If not, rotate the engine another full turn.
Do not do this on interference engines until you're certain the belt continues to be intact. If you have not already bent your valves with a damaged timing belt, you will doubtless do so when you spin the crankshaft without the camshaft spinning.
Decide if the harmonic balancer pulley must be eliminated to take away the timing belt cover. Usually, the quilt saddles over the end of the crankshaft, and this pulley is not going to can help you take away the cover with out first removing it. Be aware that an additional seal might be needed to reinstall it if that is the case.
Remove the bolts or screws holding the timing cowl in place.
Remove this cowl off the engine.
Some engines have a two-piece timing cover. Remove any components or accessory drive belts that intervene with removing the timing belt cover. This varies by model; seek the advice of your service guide to find out which parts must be removed out of your vehicle.
Check for correct alignment of the crank and camshaft timing marks.
Many engines have a dot or index line on the pulleys and/or sprockets that must be lined up with corresponding marks on the block, cylinder head, or accent shaft. On some engines, the index mark on the camshaft sprocket aligns with the parting line of the first camshaft-bearing tower.
This is essential should you're changing a timing belt that has broken. Seek the advice of your service guide for the right alignment process for your car and proper any misalignment before installing the brand new timing belt. These marks may be displayed on a label on the timing belt cowl on some engines.
Test the area across the belt for signs of oil leakage.
Look around the camshaft and crankshaft seals, as well as the valve cowl and oil pan. Check for coolant leaks from the water pump and water pump by-move hose. Leaks ought to be repaired before the brand new belt is installed.
Loosening the Tensioner
Loosen the mounting bolt(s) holding the belt tensioner. Do not remove them completely. As an alternative, pivot the spring-loaded tensioner away from the belt after which retighten the mounting bolt(s) to carry the tensioner in the unfastened position.
Look at the tensioner pulley for harm corresponding to dents or cracks.
Spin the tensioner pulley and hear for a rattle or buzzing noise that will indicate loose or worn bearings. Uneven put on on the rear of the old timing belt might point out a misalignment between the tension pulley and timing belt resulting from worn bearings.
If any indications of harm or worn bearings are discovered, exchange the tensioner pulley. The completely lubricated tensioner pulley bearing can develop into dry, worn, unfastened, damaged or can freeze up, so the best practice is to exchange it, if it's not new.
Putting in the New Timing Belt
Slide the belt off the sprockets.
With the tension on the timing belt relieved, the belt ought to slide easily off the sprockets. Timing belts that have been used for a very long time could stick in the pulley grooves and require some light prying with a screwdriver to release.
Replace with a new belt and reassemble. Torque the timing belt to the right specifications, paying particular consideration to "torquing" specs on the engine handbook, particularly the crankshaft pulley mounting bolt which often has a very excessive torque spec.
If outfitted with a hydraulic timing belt tensioner, elimination could also be required to compress the piston again into the cylinder. Place into a vise and compress until holes line up to permit the insertion of a holding pin. Once the pin is in place, the tensioner will be re-installed.
Written By George James on Selasa, 17 Juni 2014 | 15.34
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