![]() For the crankshaft below, there probably will be a timing mark on the damper pulley that lines up with another mark on the lower cover. Get your marks lined up right the first time.Īfter you remove the top section of the timing belt cover, you should see a timing mark on the camshaft sprocket - this mark usually lines up with the edge of the cylinder head or valve cover. 1's valves are closed (which begins the compression stroke) in order to re-index the engine. Then you'll get confused and have to pull off the valve cover as you try to determine when No. If you try to remove and replace the timing belt with the engine in any other position, chances are good you'll throw things out of time. Why? 1) That interference engine thing again and 2) Every camshaft and crankshaft on planet Earth is indexed to No. 1 cylinder at top dead center (TDC) on the compression stroke before attempting to replace the timing belt. We cannot stress this enough: Be careful! Make sure you know where the timing marks are on your engine, and that you have them set up properly with No. Media Platforms Design Team Time and Time Again For your car's maintenance schedule, consult the owner's manual,, or the belt manufacturer's poster hanging on the wall at your favorite parts store. So replacing this cogged reinforced-rubber belt at regular intervals - generally every 60,000 miles unless the car manufacturer specifies longer - is a lot less expensive and aggravating than having it break first. The timing belt (or chain) is the sole component that keeps the camshaft (make that camshafts on a DOHC or V-type OHC engine) and crankshaft in sync. Unlike belts, timing chains usually don't have a routine replacement interval. For the record, many engines - like those in more expensive models - still use timing chains, rather than belts, like they did back in the day before the popularity of overhead camshafts. It's best to replace the timing belt according to your carmaker's recommended schedule. You probably could have avoided this particular bit of unpleasantness with timely maintenance. Sadly, sales brochures don't list whether an engine might suffer catastrophic damage if the belt goes. You're one of the unfortunates with an "interference engine" - an engine that can leave one or more valves still propped open far enough to contact a piston when the belt parts. Now he gets to charge you for the tow, the belt replacement and a valve job, because there's no compression on two cylinders. Your mechanic says your timing belt failed, then he chuckles into his shirt pocket. Specifically, the engine suddenly goes dead silent one fine day. Your six-year-old econobox is starting to show a bit of wear and tear, but everything mechanical still works fine. check your owner's manual for the manufacturer's replacement interval. Of course it's best to use the service manual, as it has all the diagrams.Timing belts last 60,000 to 100,000 miles. If you don't have the service manual, one way to set the timing is to mark the position of all sprockets with the old belt still installed and then use those marks to set the new belt properly. In some cars, the intermediate shaft or the balance shaft must also be aligned with a camshaft and the crankshaft. Each vehicle has a way to align the timing belt with the camshaft(s) and the crankshaft. Q: How can I set the timing belt A: When the timing belt is replaced, the new belt must be set according to the timing marks so the camshaft(s) will be precisely timed with a crankshaft. You can just call your local dealer service department or a repair shop for an estimate. along with the timing belt this obviously will cost more. Often your mechanic may recommend replacing a water pump or some other parts, such as, tensioner, seals idlers, etc. The cost to replace a timing belt may vary from about $200 to $750 depending on a model. You can check the "Timing Belts" section of website to see if you have and an interference or non-interference engine. The damage will be less extensive in a non-interference engine but in either case, the engine will stall, leaving you stranded. This may result in a heavy damage to the engine with broken or bent valves, damaged pistons and, possibly, destroyed cylinder head and block. This will cause the pistons to strike the valves that left open. The heavier crankshaft will continue rotating by inertia, moving pistons up and down. Signs of automatic transmission problems.How to check the engine when buying a used car.How to get the best deal on a used car?.Buying a Used Car: 10 Common Mistakes to Avoid.
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