Question about Chevrolet Impala

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I know how to kinda do the timing but when i have the timing light on the marks i dont know which mark is suppose to be the 4 deg tdc.

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Your auto's spec sheet should tell you what your timing degree should be. For example, a 1969 Ford 429, 6 Degrees BTDC @ 550 rpm in drive gear - with automatic trans, with a firing order of 1-5-4-2-6-3-7-8. All this means is that you want to line up the pointer on the timing light with the 6° timing mark when the engine is idling in gear at 550 rpm. As you can see, it also says something about "BTDC" for this Ford. There is also an "ATDC." "Before Top Dead Center" and "After Top Dead Center" - top dead center is the point where the piston reaches the highest point in the cylinder and that is when the compression is the greatest. Now, your timing marks with have a line labeled "0" with marks above and below it, and depending on which way the wheel rotates, you will see the lines before the "0" (BTDC), or after the "0" (ATDC)

Posted on Aug 05, 2010

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your supposed to line up marks at tdc which is the #1 cylinder all the way up. there should be a tdc mark on the crank. if you did it on #4 you are sparking on the exhaust stroke be careful this could blow a rod very easy.

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If the distributor was removed during the belt replacement, make sure it is in time with the crankshaft timing mark. When the No. 1 cylinder piston is at top dead center, the crankshaft timing mark should be on 0 deg. and the distributor rotor should be pointing to the number 1 terminal on the distributor cap at the same time.

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You don't say what car or how many cylinders, so lets try a generic fix. With the tappet cover off, turn the engine until the valves on #1 cylinder rock. At this point the timing mark on your pulley should line up with the timing mark on the casing, if they do not your cam timing is out. Note that when these marks line up, your distributor should be pointing 180 deg. from the #1 plug lead position. You need to turn the crankshaft 360 deg. to get #1 TDC.

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I am planning to replace the timing belt on my daughter's 95 Corolla and was wondering what I need to align where before removing the belt eg How do I find TDC? Camshaft pulley and Crankshaft pulley...


TDC is top dead center/ remove spark plug on cylinder no. 1/ rotate the crankshaft pulley using a socket wrench and power handle and check if the piston on your cylinder no. 1 reach the top center that is TDC/ remove timing belt cover and locate a synchronized marking on your camshaft and crankshaft pulley/ remove old timing belt/ install a new one but make sure that the mark on your camshaft and crankshaft is perfectly synchronized before putting the cover/ manually rotate the crankshaft pulley again and see if it rotates 360 deg. freely then you can be sure you did the job correctly.

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you only hand turn twice

get number one cyl up on compression stroke both vales closed piston to top of stroke

put the cam with the tooth out to align marks

try again

unless you are 180 deg out should be right




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the red mark is where the timing is supposed to be after u have bypassed the electronic advance.the first white line on the left is tdc.
thanks for useing fixya

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