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