Here is all the tech info for removing and replacing....hope this helps you:
4-Cylinder Engine
Before servicing the vehicle, refer to the Precautions section.
Remove or disconnect the following:
Negative battery cable
Right hand engine cover
Cover over the right headlamp
Accessory drive belt
Front timing cover
Servo reservoir
Position Volvo lifting beam 999 5006 or equivalent slightly in front of the front lifting eyelet for the engine. Use Volvo lifting arm 999 5383 or equivalent and Volvo lifting hook 999 5460 or equivalent to raise the front of the engine a few millimeters.
Remove or disconnect the following:
Right-hand engine mount
Right front wheel
Turn the crankshaft until the markings on the crankshaft and camshaft pulley correspond. Turn the crankshaft a further 1/4 turn clockwise and then back again until the markings correspond. The markings are illustrated. Remove the upper timing cover.
Slacken off the center screw for the belt tensioner slightly.
Turn the tensioner clockwise to 10 o'clock.
Remove or disconnect the following:
Air baffles
Lower belt cover
Timing belt
To install:
Turn all the pulleys listening for bearing noise. Check to see that the contact surfaces are clean and smooth. If the tensioner pulley lever or idler is seized, replace it.
If replacing with a new idler pulley, tighten to 18 ft. lbs. (24 Nm).
If replacing tension pulley, screw into place using the center bolt by hand. Ensure that the tensioner fork is centered over the cylinder block rib. Ensure that the Allen hole on the eccentric is at "10 o'clock".
Install the timing belt in the following order:
Around the crankshaft sprocket
Around the idler pulley
Around the camshaft sprockets
Around the water pump
Onto the belt tensioner
Carefully turn the crankshaft clockwise until the timing belt is tensioned. The belt must be tensioned between the intake camshaft pulley, the idler pulley and the crankshaft
Hold the belt tensioner center screw secure. Turn the belt tensioner eccentric counter-clockwise until the tensioner indicator passes the marked position.
Then turn the eccentric back so that the indicator reaches the marked position in the center of the window and tighten the center bolt to 15 ft. lbs. (20 Nm).
Press the belt to check that the indicator on the tensioner moves easily.
Install or connect the following:
Lower belt guard
Air baffles
Upper timing cover
Turn the crankshaft two turns. Check that the markings on the crankshaft and camshaft pulley correspond.
NOTE
Check that the indicator on the belt tensioner is within the marked area.
Install or connect the following:
Lower timing cover
Front timing cover and tighten to 9 ft. lbs. (12 Nm)
Accessory drive belt
Engine mount and tighten to 49 ft. lbs. (67 Nm)
Servo reservoir. Tighten bolts to 37 ft. lbs. (50 Nm).
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just align the cam and crank marks with the marks on the covers. the timing marks WILL NOT ALIGN with the number one piston on TDC. just align the marks and the car will run ok. that's the correct way to do it.
well timing on a volvo can some times a pain I would say start with ( with out looking at my self ) checking the timing belt or chain is not broken, by looking in side the oil fill cap at the cam shaft to see if it is moving. If the cam is moving it may have jumped time. you would need to reset the timing, also check your harmonic balencer for proper alingment to the crank shaft, and timing marks line up . look for timing mark alingment in your owner's manul.
hope this helps you if it dosen't please give me more information on your problem with the timing in detail.
The timing marks on the cam gears align with the timing marks in the rear timing cover. The timing mark on the crank gear aligns with the timing mark on the oil pump assembly.
The tensioner is set by rotating the tensioner clockwise until the holes in the tabs on the left side of the tensioner are aligned, then tighten the center bolt.
Hi, this is how to align timing on a 1991 Volvo 740.
There are marks for all three. Cam and Aux shafts have dots on face of outer gear. Cam lines up with mark on rear timing cover(about 1 o'clock). Aux lines up with mark on seal housing (about 3 o'clock) and crank lines up with mark on seal housing (about 12 o'clock). Take care
camshaft pulley has a notch which lines up with notch on cam cover at approx 11o'clock, crankshaft marks also approx 11 o'clock and the aux shaft for distributer has marks at 9o'clock
First, your belt should have marks on it. they line up to the marks on the cam and the mark on the crank. If you don't have marks, check the old belt. If it has marks, transfer them to the new one. They are important and make the job 10 times easier. Your crank should be on tdc, on it's mark, and your cams also, on their marks. Once there, the cams can be clamped so they don't spring. If you have to move the engine, pull some spark plugs to take off the compression. Turn it over with a big socket on the crank shaft. Don't forget the pistons will hit the valves if they are not moving with the crank, so do the cams first, to get them out of the way, they only spring a little, 1/4 turn at the most. Get it lined up, get the belt lined up, pull the pin on the tensioner, you should be all set. Hope this helps.
I hope you've solved the problem by now, but there are alignment marks on the crank shaft (top pulley), idler (lower side), and cam shaft (smaller, bottom pulley) which should be aligned with stationary marks on the timing belt rear cover.
The belt has marks that align with the aforementioned marks (lines). The double marks on the belt align with the camshaft marks and the single marks with the others.
Loosen the tensioner clamp (nut) to allow the spring loaded tensioner to press on the belt and retighten the nut.
Rotate the crank shaft (clockwise, probably two revolutions) and make sure the pulley marks realign to the marks on the cover (they don't have to realign with the marks on the belt).
Rotate the crank shaft a full revolution once the belt is on and check that alignment is preserved.
Periodically loosen and retension the tensioner nut (access through a hole in the cover) to ensure that tension is maintained as the belt relaxes.
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