Question about 1994 Chevrolet S-10

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There are 2 marks on my harmonic balancer.one is tdc and the other is bdc rite.which one do i use in timing this engine.also do you have any idea what color the wire is you referred me to earlier.

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Its brown with black stripe

Posted on Apr 05, 2011

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Use top dead center TDC

Posted on Apr 05, 2011

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1 Answer

Which is the correct timing mark on the DAYCO PB1001N harmonic balancer, for the 1967 Dodge D100's 225 CID 3.7L engine?


Bring #1 cylinder up on compression stroke, TDC this will tell you which mark to use.

Dec 13, 2015 | Dodge Cars & Trucks

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How to set crankpully on 1989 Ford escort 1.9 liter engine for timing set up


most crankshaft pulleys ( harmonic balancer ) are keyed onto the shaft and held there with a bolt
in that case the timing mark will always be in the right place
otherwise set the no 1 piston on tdc (remove no 1 spark plug and with a bit of light gauge wire move the crank until the piston comes up and then starts to go back down)
the mark on the balancer should be at the tdc mark on the timing case cover

Oct 07, 2015 | Ford Cars & Trucks

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How do you set TDC?


Yes, there's timing marks on all engines. You'll find a mark on the harmonic balancer that the pullys bolt to on crankshaft. Other mark is on a tab bolted to the engine to one side of the balancer. There's a TDC mark stamped into this tab for Top Dead Center of the #1 cylinder. Place these to marks in alignment and your there.

Sep 24, 2014 | Cars & Trucks

1 Answer

How TDC related to timing


TDC stands for 'Top Dead Center', and refers to the first piston and the harmonic balancer: with the spark plug removed in the first firing cylinder, you turn the harmonic balancer till it tops out (the piston-you can use the eraser end of a pencil, sticking it down till you feel it hit) when accomplished you set your mark and that is your TDC now you adjust with a timing gun/light using that mark. This is always nessecary when engine has been changed, altered or rebuilt, because stock specs no longer apply. . .

Sep 02, 2014 | Cars & Trucks

1 Answer

How is the timeing marks r aline 19992.5 ford ranger


At the front of the engine you will find a pulley that will drive the belts to run the water pump, alternator, power steering pump, air conditioner, etc. This pulley is called the 'Harmonic Balancer' and is actually 2 pieces pressed together on a rubber bush which acts as a 'shock absorber' for the engine. This pulley is marked with several lines to indicate the position of the engine rotation, measured in degrees. The longest line usually indicates TDC (Top Dead Centre of piston No 1). The other lines indicate where ignition should fire (Usually between 5-10 degrees before TDC) and where valves are opened and closed (before and after TDC) both ignition and valve timing vary depending on engine/camshaft configuration. The lines on the harmonic balancer will align with a pointer that is cast into the timing cover.

Jun 22, 2014 | 1996 Ford Ranger SuperCab

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99 chevy vorte marks wont line up


if you lined up marks on cam and crank gears when you installed timing chain and you used the original timing cover and timing mark tab and did not turn engine before checking the marks the balancer is spun and needs to be replkaced if the engine has been turned it may be 180 degrees out of time you will need to turn engine at least two full revolutions and recheck maybe upto 4 times if it still does not line up with all original parts no chrome timing covers or timing tabs the balancer is bad and needs replaced

Mar 27, 2012 | Chevrolet Tahoe Cars & Trucks

1 Answer

I have 200 6cly i had to repace the dedistributor now i can not get it runing


When replacing the distributor you have to make sure it is kept "in time".
If you did not keep it in time, then you will have to retime the distributor.

How to time an Engine


Technique used before and during the reinstallation of the distributor.

Note: Requires two people or a special momentary contact bump switch.


  1. Find the TDC mark on the harmonic balancer. Clean it off if necessary so you can see it easily.
  2. Remove the #1 spark plug and place your thumb over the spark plug hole.
  3. Have your helper bump the engine over carefully using the ignition switch or you can do it using a specially made bump switch connected to the starter solenoid.
  4. When you feel and hear pressure build up and escape from under your thumb stop bumping the engine over.
  5. Look at your harmonic balancer. If the TDC mark is not lined up with the timing pointer, then you will need to rotate the engine in its normal running direction with a socket and ratchet or breaker bar placed on the harmonic balancer bolt. Turn the engine carefully, exactly lining up the TDC mark with the timing pointer. If you go past the TDC mark you will have to start over.
  6. Once the TDC mark is lined up properly with the timing pointer you are ready to install the distributor. Make sure your oil pump driveshaft is in place then place the distributor in the hole. Do not force it. Carefully rotate the distributor shaft until the distributor falls into place. Then put the rotor on the distributor and make sure it is pointing at #1 plug wire terminal on the distributor cap. It may take several tries to get the distributor rotor pointing in the correct direction.
  7. Once you have the rotor pointing at #1 plug wire terminal on the distributor cap, snug the distributor clamp down and you are ready to install the cap and run the plug wires. Then you can start the engine and set the timing to the specification desired using a timing light.

Apr 21, 2011 | 1965 Ford Mustang

1 Answer

Where is the reference mark, for TDC of the 1st cylinder, according to the pneumonic balancer located and what does it look like? I have a cougar with 3.8 V6 motor. Need help locating these marks.


The TDC mark on the "Harmonic" balancer is a white line. It is located on the thick metal part of the balancer nearest to the engine block.

Feb 09, 2011 | 1992 Mercury Cougar

1 Answer

I have the distributor out of a 2000 Blazer with 4.3L engine. Manual says to line up 2 marks on harmonic balancer with timing marks on front of engine with cylinder 1 at tdc on compression stroke. Can you...


its real simple on the harmonic balancer the outer ring has a line in it on the front of engine there is a timing tab that hangs over the harmonic balancer line up the line with the correct timing degree 4 6 or 8 but to check for compression stroke number 1 piston has to be up and both valves have to be closed hold your finger over the number 1 spark plug hole and have someone tap the key till air blows your finger off the hole line up timing mark on balancer it should be close now you could use a socket on balancer bolt now drop in distributor lining up rotor with the number 1 spark plug wire rotor should point towards number 1 spark plug on engine driver side front distributor wont be all the way down because it has to drop into oil pump shaft just turn engine over with a ratchet on harmonic balancer bolt one or two revolutions and distributor will drop right in to oil pump then install retainer and bolt for distributor then use a timing light while engine cranks to get timing close to start it then time it correctly after it starts

Aug 25, 2010 | 2000 Chevrolet Blazer

1 Answer

Timing marks on crank 99 passat


Do you have a 1.8T or the V6?

On the 1.8T, there is not timing mark on the crank. The mark is on the harmonic balancer. The corresponding mark is on the plastic cover for the timing belt, so to get TDC, you must first install the lower timing belt cover and then install the harmonic balancer.

Looking at the manual for the V6, it appears that it is the same. The marks are on the timing belt cover and harmonic balancer.

Jul 01, 2009 | 1999 Volkswagen Passat

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