Volvo V70 Timing tool

The cam timing tool is such a simple device you can make one.
On the back of the cams, after removing the covers, are two grooves that should be parallel with each other and the top surface of the cylinder head. Three peices of 3/16th flat bar welded or bolted together into a squareish "C" shape and pushed into the two grooves will lock the cams in place. You can now remove the cam pulleys and change the front oil seals (highly recommended when changing the belt)

If your pulleys have the elongated bolt holes where they bolt to the cams, this will make putting the belt back on much easier. Leave the six pulley bolts just less than finger tight, turn them clockwise until they are at the end of the elongated holes, install the belt (assuming the crankshaft is on timing mark) and pull the pin from the tensioner. The pulleys will turn as the slack is taken up, but the cams will not move. Now tighten the six bolts. Remove the locking tool and turn the engine over by hand (spark plugs removed) and check the timing. Crank pulley on it's mark, cam locking tool able to go back into the groove..