Your six year old econobox is beginning to show a bit wear and tear, but everything mechanical still works fine. Until it does not. Specifically, the engine suddenly goes dead silent one fine day. Your mechanic says your timing belt failed, then he chuckles into his shirt pocket. Now he gets to charge you for the tow, the belt substitute and a valve job, as a result of there is not any compression on two cylinders.
You’re some of the unfortunates with an “interference engine” an engine that can leave a number of valves still propped open far enough to contact a piston when the belt parts. Sadly, sales brochures don’t list even if an engine might suffer catastrophic damage if the belt goes. After you remove the pinnacle component to the timing belt cover, remember to see a timing mark on the camshaft sprocket this mark customarily lines up with the fringe of the cylinder head or valve cover. For the crankshaft below, there probably could be a timing mark on the damper pulley that lines up with an alternate mark on the lower cover. Or, the carrier manual may direct you to the transmission end of the engine to glance through a hole in the bellhousing for a timing mark on the flywheel. The flywheel is bolted to the other transmission end of the crankshaft.
On some automobiles, you may also find these marks in all three places. This tensioner may be an automatic hydraulic type that you just crank in one course to take away the old timing belt. Or, you may ought to loosen the tensioner pulley adjustment bolt to release the anxiety and the belt. Before continuing, confirm which way the engine rotates during normal operation. Pull the fuel pump relay or fuse first if you wish to disconnect fuel lines the way we did.
Don’t ask how we found this out. We’re still getting the fuel smell out of our coveralls. Knowing which way the engine turns is vital for checking the brand new belt’s alignment later; you don’t are looking to be off by a tooth on some of the sprockets. The simplest way is to have a helper bump over the starter motor with the ignition key whenever you watch the engine. Of course, now you’ll must reset your timing marks by hand. Don’t rotate the engine backward to the marks.
Crank it around ahead to hold the accurate tension and to keep the belt from leaping teeth. If you’re working with a manual tensioner pulley setup, now is when you carry out the factory procedure to tighten the brand new belt. A hydraulic tensioner takes care of this for you. Once the tension’s set, place a socket on the big nut holding front pulley on and use it to show the engine over two complete crankshaft revolutions in the course of ordinary rotation. Line up all of the timing marks again. Everything still on the cash?Then you’ve complete replacing the timing belt but you have got an alternate hour’s work to reinstall the cam belt covers, any shrouding, and all the wires, engine accessories and hoses you moved or removed.