This is the timing belt replacement procedure to 1999 Vovlo V70
with the B5254s engine
1) Lift power steering and anti-freeze resevoirs slightly and disconnect electrical connector for antifreeze sensor. Then carefully lift both resevoirs and position it on top of the valve cover.
2) Relieve the tension from the serpentine belt tensioner pulley and remove the serpentine belt.
3) Remove the screw holding the plastic timing belt cover and carefully remove the cover.
4) Locate the timing marks on the camshaft pulleys. I highlighted the marks with paint to make them easier to see. I took a dab of white touch up paint and put it on each mark, then waited a minute and then wiped the excess paint carefully, leaving a white line for the mark. The mating marks for the cam gears is on the upper cam gear cover. The marks are rectanular cutouts on the underside of the cover. I was unable to line up the marks unless standing on my head so I extended the marks to the outside of the cover with a white painted dot. This trick made life much easier.
5) Reinstall the timing gear cover.
6) Place a 32mm socket on the crankshaft pulley and connect a breaker bar to the socket. Slowly rotate the engine crankshaft (clockwise) until the camshaft timing marks are aligned with the marks on the gear cover. (I preferred to do this job with the spark plugs installed. I found it easier to keep the engine in time by using the engine compression).
7) Remove the vibration damper by removing the 32mm nut and remove all of the 10mm screws. Carefully pry the pulley from the shaft. There is an alignment pin which allows the pulley to be installed only one way. With the vibration damper removed you can now check the timing alignment with the crankshaft and it's witness mark.
8) Remove the small timing belt shield from the underside of the crankshaft. This shield is helt in place with 2 screws.
9) Loosen the ttiming belt tension and remove the old timing belt.
10) This is a good time to check the waterpump for any signs of wear or leaks. Mine was leaking after 101,000 miles. I also replaced the tensioning pulley and used Volvo OEM parts. (The old Volvo parts lasted 100,000 miles, that is good enough for me).
11) Reverse the procedure for installing the new timing belt.
12) After the belt is installed and properly tensioned, put the breaker bar with the 32mm socket onto the vibration damper and rotate the engine (clockwise) slowly until your timing marks are again aligned. If they are not, remove and reinstall the belt. Don't get frustrated just think of all of the money you have saved by doing this job yourself.