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How can I tell win the NO.4 cylinder is on the TDC of its compression stroke?

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Remove your valve cover, remove #4 plug rotate engine until untill #4 piston is top dead center and all you valves on #4 are closed and you are there

Posted on Dec 09, 2009

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Posted on Jan 02, 2017

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Firing order for rocam1.6


A six cylinder in-line engine has a power impulse every 720 degrees/6 i.e. 120 degrees of crankshaft rotation. The crankshaft has six crank-throws placed at 120 degrees out of phase with one another, which can be arranged only in three planes. Therefore, the crankpin phasing is arranged in pairs. For heavy-duty diesel engines, seven journals and bearings are provided, at each end and between adjacent crankpins. For petrol engines only 4 or 5 main journals are provided. The firing order with the crankshaft arrangement shown in the attached figure is considered. With piston 1 at the top of the compression stroke, its opposite piston 6 is at the top of its exhaust stroke. Rotation of crankshaft through 120 degrees brings pistons 2 and 5 to their TDC and either one of these can be arrangement to complete a compression stroke. If piston 5 is arranged to be at the end of compression and at the start of its power stroke, then piston 2 must be on its exhaust stroke. Rotation of crankshaft through second 120 degrees positions pistons 3 and 4 at the TDC, so either one of these can be on the compression stroke. If piston 3 is made to be on compression, piston 4 must be on its exhaust stroke. A third rotation of 120 degrees brings pistons 1 and 6 back again to TDC, where piston 6 is arranged to be on the compression and piston 1, therefore, be on its exhaust stroke. A fourth 120 degrees rotation brings pistons 2 and 5 to their TDC. Piston 2 is now on its compression and piston 5 on its exhaust stroke. Rotation of crankshaft through fifth 120 degrees brings piston 3 and 4 to TDC. Piston 4 is on compression and piston 3 on its exhaust stroke. Final rotation of 120 degrees completes the 720 degrees displacement of crankshaft and brings the pistons into positions for the next cycle. This cycle provides a firing order of 1, 5, 3, 6, 2, 4. If the phasing of paired crank-throws 3 and 4 and 2 and 5 are interchanged, then a second equally suitable firing-order of 1, 4, 2, 6, 3, 5 is achieved. This arrangement provides excellent dynamic balance and evenness of torque, and is preferred for engines larger than 2.5 liters provided length is not a prime consideration.

Sep 28, 2016 | Cars & Trucks

1 Answer

When replacing the motor an transmission on a 83 datsun 280Zx how do I set the timing


Remove #1 spark plug, turn engine to TDC #1 on compression stroke (you can tell this several ways--put plug in loose and listen for compression escaping, use compression gauge, stick finger in hole to feel pressure (not recommended cause as engine goes past TDC may suck finger into hole), or examine valves if cover is off-you should have intake closed and exhaust closed). There should also be marks on the crank pulley, but the TDC mark can be showing TDC on compression stroke or 360 degrees off on exhaust stoke. If this doesn't help, google search 4 stroke engine cycles.

Oct 08, 2015 | Datsun Cars & Trucks

1 Answer

My timing is off on my 99 nissan sentra. Where should the timing marks on the top half of the sprockets be? And should the distributor be pointing at 1 if the number one cylinder is tdc?


It will only be pointing to #1 at TDC of the compression stroke. If it is at TDC of the exhaust stroke, the rotor will be pointing exactly opposite- to #4.

Post back if you need to find the compression stroke on #1 cylinder.

If you register for free at autozone.com, you can list your make, model, year, and engine size, and then find timing diagrams and information about the timing under the "repair guides"- specific to your vehicle.

Dec 18, 2014 | Cars & Trucks

2 Answers

After top dead center what valve starts opening number 1 intake or number 1 exhaust?


It depends on which TDC you are talking about, compression TDC or exhaust TDC. On the compression stroke, no valves will open after TDC-this is when combustion has occured, the power stroke. When the piston reaches bottom and starts up on the exhaust stroke, then exhaust valve will open. At TDC of exhaust stroke, exhaust valve will be closed, and the intake valve will then open as piston is moving down.
If you have the intake valve opening right after TDC, you are on the exhaust stroke of that cylinder. The exhaust valve is only open during upward movement of the piston on the exhaust stroke. Immediately after TDC of exhaust stroke, the intake will open as the piston travels downward.

Mar 04, 2014 | Mitsubishi Cars & Trucks

1 Answer

Step by step instructions on timing belt installation 2000 hyundai accent


Right, so you have two TDC's-the exhaust stroke and the compression stroke Top Dead Center-and both occurr when the crank hits the zero mark on the timing scale.
Always set timing with the number one cylinder at TDC on the compression stroke. How do you know which is which? If you have a distributor, the rotor will be pointing to number one cylinder tower, when at TDC of the compression stroke. If you are on the exhaust stroke's TDC, the rotor will be pointing just opposite of number one .
If you don't have a distributor, look at the valves for cylinder one under the valve cover. If at TDC of compression stroke, both valves will be closed. At TDC of exhaust stroke, the exhaust valve will be open.
You can also find the compression stroke on number one by pulling out the spark plug for number one, and either put a wrench or socket on the crank pulley and turn it clockwise, or use the starter and bump the engine over in short bumps. Put your finger or thumb over the spark plug hole and feel for the pressure to build up. As soon as you feel pressure on your finger, (if turning by hand, pressure will be slight, but you can feel it) you are on the compression stroke. Stop bumping the starter and turn the crank on around by hand until the zero mark lines up on the timing scale-TDC of compression stroke! The exhaust stroke will have no pressure build-up as the piston comes to top-because the exhaust valve is open. On the compression stroke, both valves are closed as the piston travels up the cylinder.

Dec 07, 2012 | Cars & Trucks

3 Answers

Put on a new timing belt now it wont start


I need some clarification. Did you replace the belt because it broke? If so you may need to replace the head. The problem is if the belt breaks when your moving it usually damages the head and thus needs to be replaced.

Jul 25, 2012 | Plymouth Breeze Cars & Trucks

2 Answers

On the ford 1996 mustang crankshaft pully you have10,0,10 ,20 which 10 is the TDC engine 3.8


Niether, 0 Is top dead center. The numbers to the left are before top dead center, number to thr e right are after.

Feb 05, 2011 | 1996 Ford Mustang

1 Answer

My crank shaft is rotating twise the crank shaft. HOW MY 1342 FIRING WILL OCCURE?, I can spare only 30 digree for charge and spark plug contact. THERE ARE ONLY 2+2 CYLINDER. 180 DIGREE APPART KINDLY REPLY...


Your crankshaft turns 2x times the camshaft. Put it this way as # 1 cylinder reaches TDC (top dead center) of the firing/compression stroke, and this will be after a (8 degs BTDC) spark to ignite the air/fuel mix, the # 3 cyl. will be at BDC of the intake stroke and as #1 begins its power down stroke, (during explosion of air/fuel mix), #3 begins its compression up stroke, the #4 cyl. will be coming down with #1 cyl. but #4 will be in the beginning of its intake down stroke, and #2 cyl. will be coming up with #3 but #2will be in its BDC of the exhaust stroke. Which has just fired previously to #1. 1342134213421342 etc. Now the cam turns to open / close the valves; In the outline above, #1 cyl. valves will both be closed. #3 cyl. will have the intake starting to close at this point. #4 cyl. will just be starting to open its intake valve, and #2 will be starting to open its exhaust valve. Is all this clear as mud? So as the crank makes one full rotation (in a 4cyl. engine) only the firing of one cylinder has happened.and at every rotation one cyl. will fire. So #1 at TDC then one full rotation, #1 back at TDC, but this TDC is half of its 4 cycles, (1)Intake, (2)compression, (3)power, (4)exhaust. this 1234 refers to the 4 cycles of the rotation not firing order.

Oct 31, 2010 | 2008 Volkswagen Jetta

1 Answer

For a 6 cylinder 4 stroke what is the position of all cylinder when cylinder number 1 is at compression stroke


on a proper TDC timed dead Compression your harmonic damper has a mark that tells you such Zero status is alighned with a mark on the motor or plastic cover it puts you to perfect timeing

Apr 03, 2010 | 2005 Mercedes-Benz Mercedes Benz E320 Cdi

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