There are several ways to find TDC, but the easiest and most accurate I have found short of a dial indicator requires nothing more than an old spark plug, clear plastic tube, and a clear jar filled with water. It is made up of a simple fitting from an old spark plug housing, attached clear tubing and run it into a jar of water. Bubbles will come out on compression, stop at TDC and start sucking up water immediately after TDC. Work the crank back and forth slightly a couple times to get accurately centered. It is easy to see the water level position inside the small tubing. This method is very simple and very accurate. Make sure to remove all spark plugs and spray some oil in each cylinder. This will make the engine very easy to turn by hand.
OR remove #1 spark plug and slip a small device of some sort into hole and rotate motor by hand while feeling for piston to come up. once you feel the piston keep going until it stops traveling up. NOTE. the motor MUST be turned by hand. If you crank with starter it could break off what you are using to feel with.
once you establish positive TDC mark it on timing cover and balancer so you know where it is later.
It is bolted into the bottom SIDE of the timing cover on the passenger side of it behind the harmonic balancer. It is easy to change.
behind the timing belt cover easy to fix
Once you reach 100K you're running on or at the limit of life expectancy of the timing chain, chain tension-er, cam chain gear and crankshaft chain gear. All four should be replaced as a set. You will also need to replace timing cover gasket and the crankshaft front cover seal. Cost of parts < $75.00 but not an easy job.
That engine don't have a timing belt. It has a chain and gears and it would crank over real easy/freely.
I am working on that now also. It would be a easy job with the motor out as you have to take off the timing cover and remove the belt. Not an easy job in the car but it can be done. Have to remove motor mount to get to timing cover
it is drivin by the timing belt so its behind the timing belt cover. Not an easy job to replace. took me about 6 hours.
All sienna 2008 or older have timing belts. It easy to tell look at you sienna and see if there a timing belt cover. that covers the cylinder head. All vehicles that use timing chains are enclosed and not cover is showned. Since the timing chain is always be lubericate by the engine oil all the time. That's why it not exposed.
On some engines (e.g. 2.4L) the water pump is inside the timing cover. Apparently it's not easily replaced... local garage wants $1200 to replace it and recommends replacing timing chain at the same time. ON THE 2.2 ITS LOCATED DIRECTLY UNDER THE ALTERNATOR. REAL EASY TO CHANGE.
what do u mean a diagram its behind the timing cover it is driven by the timing belt if it needs replacing better do the timing belt too. Just get a chilton manual its easy.
Behind the timing belt cover, which is behind the serpentine belt you can actually see on the passenger (right) side of the engine compartment. You will need to remove the serpentine belt and numerous other items before accessing the timing belt cover - not easy. New belts are $300.
left handed drill bit, or if it wont grab, use an easy out
NEVER!... there is no timing BELT on a Chevy V8 engine for Avalanche. it has a timing Chain and should not need replacement unless damaged or abused. A good certified shop mechanic can diagnose a timing chain problem. There is a single serpentine belt for the front engine accessories - (see your manual for normal replacement cycle). easy to change yourself. the belt is not cheap! search youtube for videos to show how.