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Valve overlap when number 3 cylinder in top dead centre which cylinder the valve overlap

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  • wongseng Oct 21, 2008




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Firing order determines what is next.Follow the firing order.I know when finding compression stroke on v8 when 1 is at tdc 8 is on the rock.Cleveland v8s firing order is 18436572.

Posted on Oct 20, 2008

  • tony yeatman
    tony yeatman Oct 20, 2008

    This applys to valve clearance setting wether 4 6 8.Valves set when the cam is at lowest point in regard to the lifter,if any.Over head cams if being set properly you have to do each cylinder while it is at tdc.Which means you have to know the firing order to do the right cylinder at the right time.



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Im doing an injection pump on a new holland lx865 skid steer, it says i have to set cylinder 1 at 28 degrees from top dead center? how do i measure the 28 degrees from tdc?

diesel engines have the timing marks on the harmonic balancer or in the face of the flywheel as viewed through an opening in the block
turn the engine over until no 1 piston is coming up on compression ( (check the valve overlap rocker positions on the next piston to fire -normally no 3 as set in the firing order or when no 1 valves have max tappet clearance )

Feb 15, 2017 | Cars & Trucks

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I have a 2003 mazda 6 with 2.3 i think it might be out of time but i cant find the timing marks on the pulleys

Sir. The only other way to know your on no one cylinder top dead center is to take the numbers of the firing order,
White them down with the first 3 in one colum and the second three firing numbers in a colum next to the first three. The numbers across from each other are called " mating cylinders".
If #1 cylinder is ( example ) next to #6 on your paper, then those two are mating cylinders. Meaning one ( with valve cover/s off) will , when engine in turned over slowly, will be on valve overlap, while its mating cylinder is on
Top Dead Center to fire. In valve overlap, when the motor is turned slowly one way, the exhaust valve will open and when engine is slowly turned the other way, the intake valve starts to open. At that point when either exhaust or intake valve is moving on #6 cylinder valve trane, #1 is at top dead center which will be not even 180degrees out, but top dead center on #1 cylinder. Now your at the firing point of #1, which will coincide with the rotor pointing at #1 plug wire on the distributor cap. In essence, static ( not
engine running ) the rotor bug should be about 17 degrees early in the cap. This makes up for slack in any timing chain and gear slack between the distributor gear to cam gear. This when running put you about 4-6 degrees advanced. Computor models will time it for itself. See example below.
1 - 6
5 - 2
3 - 4
If your timing order is 153624 then use the chart. As you list your order on paper, remember one mating number is firing and it's mating cylinder is on valve overlap. 180 deg out would be
#1 valves " rocking " and no 6 is on compression. When a cylinder is on the compression stroke, valves will not move. ( both closed ). So, write down your timing order, v6 or inline 6, or 4 cyl or 8 cylinder. It don't matter. If you look at the manifold , it will give the timing order, maybe on the head or Internet. Two columns, walla.
Hope that helps get you to true #1 top dead center. This system is the only true way, along with a cardboard timing wheel for the crank if needed , to adjust valves, lifters and know where the engine is at all times.
Hope that helps. Sorry for the detail, engines are really very simple, once you " get the picture ". Don't make it to difficult. Crank turns two times to one revolution of the cam.

Jan 21, 2015 | Mazda Cars & Trucks

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What lead goes to what spark plug on nj pajero dohc as only 3 leads

your engine should be 6G76 V6

number one cylinder is closest to the timing belt

With the plug out and finger over the plug hole while turning the motor clockwise ...number one cylinder will be the only cylinder coming to compression at Top dead Centre

on the dissy The firing order is 1-2-3-4-5-6,

with rotor to number one when it is at Top Dead Center

the heads wont be 123 on one bank and 456 on the other
more like 1 3 5 on one bank and 246 on the other

hope this helps

Oct 19, 2014 | 1997 Mitsubishi Pajero

1 Answer

Cam shaft

put the notch on crank pulley align with tdc (top dead center mark) on timing cover

Remove valve cover, firing order for a 4 cylinder engine 1342, piston 1 and 4 are up in same time,rocker arm on cylinder 1 intake and exhaust must have play, while on cylinder 4 must be in overlap both valves starting to open (partly depress),if no timing mark inser a screwdriver throught sparkplug opening turn gently to get the piston at tdc if so valve timing is ok without checking any mark,if you remove the cover you will see the mark at the right place

1 and 4, 3 and 2 are companion piston, you could do the same with 6 or 8 cylinders, you must know firing order

Aug 14, 2014 | Cars & Trucks

1 Answer

Timingmarks on a 6.5l gmc diesel engine are they all at 12 o,clock,and top dead centre on no one compression stroke?

it is always best to set your timing at top dead centre on the first or number one cylinder.That way everything else should fall into line.

Feb 19, 2012 | Cars & Trucks

1 Answer

Rear head cam marks

Hi There, Didn't see your name so it's difficult to be personal. Right mister Pimpernel, this is what we need to do. the timing belt synchronizes the cam shafts with the crank shaft. These must all run in synchronization so that the valves can open without hitting the pistons as the come up to Top Dead Center. This is what we need to do. Remove the timing belt and set the Crankshaft at TDC. You should then see a mark on the block (The front oil seal housing) which aligns with the mark on the timing gear. Make sure they are perfectly aligned! Next remove the camshaft caps and identify the alignment marks on both cams. Before proceeding further check to see if there is a spring loaded section on the camshafts If there is place the cams into a vise protecting them with strips cut from a rubber mat or something similar. Rotate the tension gear and lock it in position with a ten millimeter bolt. Look for the match marks on both cams and then align them so that when fitted they keep alignment. (At Top Dead Center the cam lobes of number one piston should be pointing away from the valve underneath. The stroke is at the end of compression and about to go to ignition. All valves for number one will be closed. The firing order is 1342, meaning that as number one is beginning the ignition stroke, number four will be on overlap, with the exhaust valves almost closed and the intake valves already beginning to open. The overlap is to make the expulsion of the exhaust gas more efficient and to help the induction of the explosive mixture of fuel and air. (Did you know the optimum mixture is fourteen and a half parts of air to one part of fuel?) There's a piece of useless information for you, but the rest isn't! Let me know how you get on. Regards John

Feb 12, 2012 | 2002 Kia Sedona

1 Answer

Had the head cleaned up , need to put the cps / distributor back in i need to know the proceedure for this

u need to find top dead center on number one cylinder. to do this remove rocker cover and watch rockers move through there cycle. inlet valve opens on a downward stroke sucking in fuel, then closes the next stroke up is compression stroke and fires at top dead center then fires cylinder down. the exhaust opens on the up stroke pushing exhaust out. The top dead centre you need is after it has compressed the air fuel mixture.
then issert distributor with points clossed on No one cap and work through the firing order of the engine placing the leads arround in that order.
Hard to explain but hope its a help

May 08, 2011 | Toyota Supra Cars & Trucks

1 Answer

For the correct valve timing for ford EA falcon 6cylinder,4L is piston 6 or 1 rocking and does piston 1 or 6 need to be top dead centre

Always number one cylinder, the front most piston is always number one. The pointer in the dist cap will be pointing to the number one wire when it is at TDC. Other wise it is on exhaust stroke. Hope this helps.

Feb 14, 2011 | Ford E-Series Cars & Trucks

1 Answer

Timingchain diagram procedure for the number one piston at top dead center

if its a straight six or four cylinder if no six valve rocking then one is on top dead centre or four cylinder 4 rocking one is on t dead centre

Sep 29, 2010 | Saturn Vue Cars & Trucks

1 Answer

Specification of 4JG2 Engine-Isuzu

Four cylinder inline, water cooled, overhead valve diesel engine with dry liners available in Turbo(T) or normally aspirated(NA).
Bore 95.4mm
Stroke 107
Displacement 3.059 litre
Compression ratio 20:1
Idling speed NA 750, T 720 rpm
Firing order 1-3-4-2
Injection timing NA: 1 deg after top dead centre(ATDC), at top dead centre(TDC) for turbo
Valve clearance (cold): 0.4mm for intake and exhaust.

Oct 24, 2009 | 1994 Isuzu Trooper

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