On a 2002 Mazda V6 24 valve timing belt is been removed and cams are not aligned can you align them by hand or you need to have the belt on

First off, we need to know the model Mazda you are referring to and the engine size installed. Also, many of these engines are known as interference engines. That means is the timing belt breaks and the cams get out of sync with the crankshaft, valves can and will be bent or broken, resulting in additional repair parts and costs.

Firstly did u remove cams,if you did,align the 2 dots at the rear of cams then tighten cam bolts, the LH side cam will be close to notch on timing cover,on the RH cam you must turn cam until they align to the 2 notches on cover and cam gear,you will see a single dot and then 2 dots about 10 cm apart,use that dots to align,then align your crank,you will see it from top when you look at the crank gear that holds the cam belt in

1. Remove all spark plugs so that the crank shaft could be rotated easily.
2. Rotate the crankshaft to align the timing mark of the crankshaft gear with the index mark on the engine cover.
3.Rotate the crankshaft +/- 30 degrees to ensure that the valve could not hit the pistons when aligning the camshaft gears.
4. Align the camshafts as described below.
5. Align the crankshaft timing gear with the index mark.
6. Loose and lock the timing bearing at its farther position. Install a timing belt starting from the crankshaft gear, then right cam, then left cam, and at last the timing bearing.
7. Press and hold the timing belt to keep it firm on the gears and loosen the timing bearing. It will get adjusted by itself with the help of spring attached to it. Do not put extra force on the bearing to adjust it more.
8. Confirm the timing marks.

First pull the timing belt tensioner then slip the belt off the cam gears. You then need to find TDC (Top dead center). 3 ways to find TDC 1) There are marks on the crank pulley align them for TDC. 2) Remove timing cover and use crank gear mark seen in link below 3) Put the dip stick in cylinder 1 and turn engine until dip stick stops going up. After finding TDC align cam gear marks seen in link below. Now make sure both cam and crank stay in position and slip timing belt back on (you can move the cam gear to get the belt on but make sure the marks are aligned after the belt is on). Last tighten the belt tensioner, I usually use my finger or an extension to get some more tension on the belt. You might have to remove engine mount bracket makes life much easier as the front cover section is TIGHT !!!. Turn engine a few times to make sure you have compression and engine turns without getting stuck. See link below good luck.

http://bladeagenos21.soup.io/post/374487151/timing-marks-on-mazda-626-1994-diagram

set mark on crankshaft to TDC mark on timing cover. set mark on cam pulley to align with mark on head .if more than one mark on pulley rotate by hand till exhaust and inlet just rocking then align closest marks .

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!

No, you will have open valves when the timing marks are aligned. This will create spring pressure and will want to move the cams to a neutral position. This is why you need the retaining tool to hold the cams in the proper location while the belt is replaced.

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.

cam shaft timing marks on back of cams ,two slots ,use a flat piece of metal to align .remove no1 spark plug and drop long thin screwdriver down it to bring piston just below tdc,then align cams so both cams are on the rock (valves closed) with knob on back cam aligning with pick up sensor left side between lobes.then bring piston up to tdc and fit belt.turn engine over twice with socket on bottom pulley to make sure no valves clear pistons.Remember to remove flat edge from back of cams i didnt last time and bent my home made tool