Question about 1994 Chevrolet S-10

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How do I recognize the timing mark for zero before top dead centr

There are 30 marks for the timing on the flywheel which one is tdc?

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Easiest way to get mark is to take out number 1 plug an bring up number 1 piston to tdc put screwdriver in plug hole an bring up piston by hand until driver stops coming up then chalk up the mark

Posted on Dec 16, 2008

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How do i set timing chain on sprockets ,ie top dead centre.


I don't know what car you have, so here's what was needed on mine:
1. Bring engine to Top Dead Center, ready to fire #1. There should be a mark on the front pulley or on the flywheel. Move cams to the TDC mark, too. My car was twin cam, the front cams needed to face apart, and set the marks....

Yours may be different.

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Where should the crank pulleys mark stand for tdc.i got the timing on the flywheel spot on and number 1 valves are firing but the car does nt perform as it should.please help.its a 1987 vw passat cli 2,2


The marks on the pulley or flywheel will be TDC for top dead centre . correct ignition point is before TDC normally around 10 degrees and there will be a mark on the housing before the TDC point. You have effectively timed the spark in a retard situation and you need to get it advanced

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there should be marks on crank pully and cam belt pully. rotate motor until crank pully timing mark is on zero.the cam belt pully should be lined up with its own mark.number one piston should be at the top of its stroke (top dead centre TDC) and number one valves should be shut. if the cam belt mark is not alined with its own mark remove the belt realine the marks and refit the belt

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I used to have one of these...there are 2 top dead centre positions you have to watch for. Top Dead Centre "Compression" and Top Dead Centre "Exhaust".

With the distributor cap on, you will know where number 1 is on the distributer, remove the distributor cap and then turn the motor using the crank...keep turning until you see the rotor pointing to number 1. If the number 1 piston is at TDC then you are good to go with it being at TDC Compression- rotor at 1.
If your rotor is at number 1 but your number 1 piston is down then you need to remove the distributor from the rotor 180 degrees then slide the distributor back into the block carefully...remembering to be careful because your oil pump is run by a shaft which snaps onto the bottom of the distributor.

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1 Answer

What is the before top dead centre mark for porsche 944


on the top of your crank shaft behind the small plate and your bottom of flywheel remove front cover and turn engine over and you see the diamond mark on the crank and you should see the markings on the flywheel where the crank sensors are plus the marking point on the bottom of the clutch housing if all three ar line up properly youe timing should be good plus make sure your balance shaft roller are set also?

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1 Answer

The owners manual says for setting the timing is at 8 degrees,When using the timing light, What mark is 8 degrees?


The engine turns clockwise, the first mark is tdc (top dead centre) and the second mark is preset at 8 degrees so when using a timing light line up the second mark on the pulley with the fixed mark on the timing cover at idle

Aug 10, 2010 | 1996 Nissan Sentra

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Leaky front crank seal i just need to know what needs to be taken off to get to it and what i should be able to get arround


This requires cam belt(s) removal in order to access the seal behind the crank pulley/balancer. The front of engine comes apart including all belts, covers,pulleys and gears.Do fully understand there is special cam timing marks when setting back up ....look for three small dashes 30 degrees or so from tdc (zero) timing marks on the back flywheel

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1 Answer

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From what I see in my manual,

1.There is a Timing Pointer on the back of the engine. There is a White mark on the flywheel. The white mark must line up with the timing pointer, for Number 1 piston to be at Top Dead Center.

2.Facing the engine, looking at the camshaft sprocket. The sprocket has spokes. On one of those spokes is the word, "UP" in raised letters, or there is a small Dot. As you can see here, the spoke with the word UP goes -> Up.
(Same thing of course if it is a Dot, instead of UP)

On the back of the camshaft gear, (Sprocket), are marks. On the edges of the camshaft gear. These line up with the top edge of the cylinder head. The surface of the cylinder head, where the valve cover bolts down to.

I'm sorry, at present I do not have a website, that I could link you to for a diagram, or photo.

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You can remove the #1 spark plug and get the piston at top dead center, (all the way up in the cylinder). You can also check the access hole in the top of the transmission housing, to line up the TDC timing mark on the flywheel to the transmission housing. The mark on the crank pulley is rather hard to see, just a little mark "V'ed" into the pulley lip.

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I replace an idler gear for the timing belt on my 1991 subaru lagacy evidently I did not get the gears timed right. Please help. Thanks Jim Suiter I put the two cam gears mark lined up with the...


I think the crank is not set on zero...there is a special timing mark on the fllywheel it has to be set to and it is not zero or top dead center....look for special marks on the flywheel thru the rubber inspection slot in the back which is quite a few degrees from those timing marks that show zero.If memory serves me there are two line marks onthat flywheel that is the cam tioming marks

Jun 10, 2009 | 1991 Subaru Legacy

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