reset correct timing

how do you get the car started after timing belt been replace

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If done correctly you just turn the key, if not then open your wallet and say 'Help yourself'
mrcheerful
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Your question implies that it won't start after the timing belt was changed. The cam and the crank MUST be synchronized or the valves (in some engines) will hit the pistons and create a very expensive mess.
There must be a mark on the camshaft pulley or gear that indicates TDC (top dead center of #1 cylinder - both #1's valves closed) which should ALSO be when the crankshaft is at 00 degrees (#1 piston's stroke is at its top). You need to find someone who can tell you specifically how to synchronize these on your engine.
Remember, the camshaft turns once for every two turns of the crankshaft.
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the car will turn on and will accellerate in park not in drive. It also overheat now. Do you think valves might have the pistons cause so damage.
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It is possible for the valve timing to be wrong to an extent that the engine can run but with little power. Get the cambelt timing checked straight away.
mrcheerful
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I can't answer if the valves are damaged except to say that it's good that the engine runs.
Overheating is not good, it may be due to the valve and ignition timing being too far advanced (too early). Use an ignition timing light to determine if the ignition is correct (or advanced) for the ignition is driven by the cam - so if the cam is "off" the ignition will also be "off" specification. If you find the ignition to be "off" specification DON'T adjust the ignition because the error is in the cam.
Since you are doing the work yourself I suggest you turn the cam vs. the crank by ONE cog of the belt ONLY, turn the motor by hand to be sure the valves and pistons aren't hitting, if OK, start it. The RISK is that you turn cam the wrong way and the valves hit the pistons which will require removing the cylinder head and having a machine shop replace the bent valves etc. That's EXPENSIVE! So, if you're in doubt DON'T do anything. Have an experienced Lexus/Toyota mechanic look at the motor; he will tell you what you need to do to make it run again.
Rather than tow the car to a shop pay the mechanic to come to the car and look at it in your garage or yard.
I hope this helps you get driving again.
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