I have a 2000 Mazda 626 4cyl 2.0 liter DOHC engine replacing the timing belt, what are the correct timing marks position on both cam shafts with #1 piston at TDC

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Mazda Timing Belt Replacement

If the timing belt is immediately slipping off when you attempt to start the vehicle, that means that there is a camshaft problem, most likely the shaft bearings or clogged oil channels. If the belt stays on for a time then slips off, that means that the belt may be distorted, deformed, or otherwise defective.

Mr. RAGSDALE.
I do not know if you did strip the belt yet or not. If you did not,I will advise you a just easy and good way to do it yourself. String for the stripping,you just remove the outside belts and pulleys,remove the plastic covers of the timing belt. Just put on the crankshaft the pulley bolt and slowly slowly turn the engine until you see all the marks aligned. On the Camshafts the two sprockets do have the letters "E" and "I", E= Exhaust and I= Inlet.means that the inner to dashboard side is the inlet cam and to the vehicle front the exhaust cam. These two cams with the letters must be aligned,with the crankshaft sprocket
having on the side a small groove which mus be aligned with a small point ball behind the sprocket on the cylinder block. There are your marks. Loose the tensioner and remove the belt.

Good Luck!

You need to take off the timing belt (or chain) cover and see why the one camshaft is not turning. Maybe the belt for that cam broke or the cam has seized from a bad cam bearing. One camshaft should be for the intake valves, the other cam is for the exhaust valves.

Before you remove any thing place the engine on no 1 firing on the timing mark on the bottom pulley. when removing any thing after that do not turn the engine or the cam shaft and every thing will stay in order.; You will probably see the position of the marks in this position.

Why remove the gears? No need to. Just be sure they are clean of any belt residue. The gears are locked in the correct position for the shafts.
You need to rotate the gears to position the shafts (Crank and Cam) to the correct position before installing the belt. Follow the instructions that should have come with the belt. Usually need to line up some marks on the gears to marks on the engine case for the valve timing to work right.
Pull the spark plugs so you can turn the crankshaft easier (BY HAND ONLY) Mark the wires to reinstall correctly. I did this a long time ago. Seem to remember pointing the mark on one gear to the mark on the other gear. Use a straight edge to line up the two. Dont take this as gospel.
Good luck.

i dont have a more detailed picture of setting the timing marks for the belt so i hope this helps

if it's a dual overhead cam then each head has two cams and two pully's, a single overhead cam engine has one cam and one pulley on each head. if the belt has more than 60,000 miles on it you should replace it. you need to find out if the engine is an interference engine or not to determine the level of damage caused if the belt has jumped or slipped. your overhead cam timing marks are usually on the cam faces and the backing plate behind the cam or sometimes there's two marks on the cam that you align with the surface of the head behind them. the first thing you need is a diagram of the belt routing and mark positions because timing marks are very important especially on an interference engine. starting or cranking an interference engine with the timing marks misaligned can bend all your valves or even punch holes in your pistons! so proper alignment is crucial, good luck.

its tricky enough if your not sure what your doing but ill run you through it. 1. remove top rocker cover and timing belt cover. 2 make up the position of the pully on the cam shaft at the top and the drive shaft at the bottom, this marks are you fail safe incase you cant time the engine. 3 remove the timing belt and pully tentioner, note if your going this far you are as well to replace the timing belt,tentioner and water pump. 4 On the cam shaft at the top if you force them to turn you will see a small indicator mark on the shaft this mark has to line up with the other indicator mark on the housing between the cam shaft and the cam shaft pully, once they line up your top end is timed, mark up the pully incase it moves. 5 on the drive shaft pully there is also markings that have to line up but you can also feel the position of the pully as you turn it, you will feel the piston been forced up and it is timed at top dead centre on cylinder one, which means the the piston has to be at the top just before the point of returning back down, using your feeling as a guide and the markings lined up you will have timing. also mark up this pully, your new marking should be very very close to the fail safe markings you put on at the start. when you have your marking replace the timing belt with the longest distance between pully contact going on first, try not disturb your timing or your hard work will have been for nothing, make sure the tentioner on the belt is tight but not to tight to the point where you ll stretch the belt or snap it, put everything back as you found it and crank the engine, job done, best of luck. hope this helps( rate me on my answer thanks )

REMOVAL & INSTALLATION 1.8L Engine

1. If possible, position the engine so the No. 1 piston is at TDC.
2. Disconnect the negative battery cable.
3. Remove the timing belt covers.
4. Remove the timing (outer) belt tensioner and remove the outer timing belt.
5. Remove the outer crankshaft sprocket and flange.
6. Remove the silent shaft (inner) belt tensioner and remove the belt. Fig. 1: Silent shaft belt timing marks — 1.8L engine
   Fig. 2: Checking the silent shafts for proper positioning
   Fig. 3: Timing belt timing mark alignment — 1.8L engine
   To install:
   
7. Align the timing marks of the silent shaft sprockets and the crankshaft sprocket with the timing marks on the front case. Wrap the timing belt around the sprockets so there is no slack in the upper span of the belt and the timing marks are still aligned.
8. Install the tensioner pulley and move the pulley by hand so the long side of the belt deflects about 1⁄4 in.
9. Hold the pulley tightly so the pulley cannot rotate when the bolt is tigthened. Tighten the bolt to 15 ft. lbs. (20 Nm) and recheck the deflection amount.
10. Install the timing belt tensioner fully toward the water pump and tighten the bolts. Place the upper end of the spring against the water pump body.
11. Align the timing marks of the camshaft, crankshaft and oil pump sprockets with their corresponding marks on the front case or rear cover. NOTE: There is a possibility to align all timing marks and have the oil pump sprocket and silent shaft out of time, causing an engine vibration during operation. If the following step is not followed exactly, there is a 50 percent chance that the silent shaft alignment will be 180 degrees off.
    
12. Before installing the timing belt, ensure that the left side (rear) silent shaft (oil pump sprocket) is in the correct position as follows:
    1. Remove the plug from the rear side of the block and insert a tool with shaft diameter of 0.31 in. (8mm) into the hole.
    2. With the timing marks still aligned, the shaft of the tool must be able to go in at least 2 1/2 in. If the tool can only go in about 1 in., the shaft is not in the correct orientation and will cause a vibration during engine operation. Remove the tool from the hole and turn the oil pump sprocket 1 complete revolution. Realign the timing marks and insert the tool. The shaft of the tool must go in at least 2 1/3 in.
    3. Recheck and realign the timing mark.
    4. Leave the tool in place to hold the silent shaft while continuing.
13. Install the belt to the crankshaft sprocket, oil pump sprocket, then camshaft sprocket, in that order. While doing so, make sure there is no slack between the sprocket except where the tensioner is installed.
14. Recheck the timing marks' alignment. If all are aligned, loosen the tensioner mounting bolt and allow the tensioner to apply tension to the belt.
15. Remove the tool that is holding the silent shaft and rotate the crankshaft a distance equal to 2 teeth on the camshaft sprocket. This will allow the tensioner to automatically apply the proper tension on the belt. Do not manually overtigthen the belt or it will howl.
16. Tigthen the lower mounting bolt first, then the upper spacer bolt.
17. To verify correct belt tension, check that the deflection at the longest span of the belt is about 1⁄2 in.
18. Install the timing belt covers and all related items.
19. Connect the negative battery cable.