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Re: CAM SHAFT MARKS 2002 SATURN VUE 3.0L
This is a pretty tough timing belt job to do if you have never done one before. There is also a kit of tools that are essential to getting the timing right on this engine. The cams are numbered 1-2-3-4 from left to right if you are facing the cam sprockets. If the tensioner was broken and the engine came out of time you are probably looking at at least a few bent valves. Could be time well spent to perform a leakdown test before you spend too much time on installing a timing belt.
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The 2.2 liter engine uses colored links on the timing chain to align with the marks on the gears. You just have to rotate the engine to where the copper chain link is up on the upper right side of the intake can gear--aligned to the INT diamond on the gear. Then the silver link should be down at about 5 O-Clock on the crankshaft timing mark. The other silver link should then be aligned to the mark on the exhaust cam sprocket. See picture below.
For the 3.0 liter engine, there are marks on the belt that line up with marks on the gears. The book calls out special tools to hold the cam sprockets in alignment while the belt is put on. There is also a special tool to lock the belt onto the crankshaft sprocket. See pictures below.
Please let me know if you have questions.
camshaft sprocket alignment with belt marks
If possible, position the engine so the No. 1 piston is at TDC.
Disconnect the negative battery cable.
Remove the timing belt covers.
Remove the timing (outer) belt tensioner and remove the outer timing belt.
Remove the outer crankshaft sprocket and flange.
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
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.
Install the tensioner pulley and move the pulley by hand so the long side of the belt deflects about 1⁄4 in.
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.
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.
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.
Before installing the timing belt, ensure that the left side (rear) silent shaft (oil pump sprocket) is in the correct position as follows:
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.
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.
Recheck and realign the timing mark.
Leave the tool in place to hold the silent shaft while continuing.
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.
Recheck the timing marks' alignment. If all are aligned, loosen the tensioner mounting bolt and allow the tensioner to apply tension to the belt.
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.
Tigthen the lower mounting bolt first, then the upper spacer bolt.
To verify correct belt tension, check that the deflection at the longest span of the belt is about 1⁄2 in.
Install the timing belt covers and all related items.
only the outside pulley needs to coime off not the cam belt sprocket ,from the sound of it ?? i feel you should entrust this job to the local garage because if you make a mistake you will crunch the valves into the pistons
This is not your average timing belt replacement due to being a double overhead cam that is also an interferance fit.First remove cooling fans.2-Loosen drive belts and remove.3-Remove crank pully.4-Remove timing covers.You will see 4 cam sprockets.Theses sprockets contain single and double referance marks.You will be using the double referance marks.Rotate engine until the double referance marks are facing each other.This is to be done the same way that the American autos timing Chain systems are done but you will have 2 small double lines to line up not dots.The next step is the most important step and is of utmost imortance.THE CAMSHAFT HAVE TO BE LOCKED IN PLACE--FAILURE TO DO SO CAN RESULT IN BENT VALVES.The cam sprocket holders can be bought or rented.You can make your own as well by making 2 wedges with bolt through the middle.Slip in between sprockets and tighten enough to hold sprockets.Do not use excessive torque while tightening wedges sprockets are not made of steel but rather a composite material.Next you will have to remove the tenioner.The tensioner has to be retracted and pin istalled to hold in retracted position.The tension device has to be retracted with care or will be damaged.You can not exceed 50 pounds pressure on the plunger.The simplest method is to reract while still in vehicle, it takes 15 minutes to properly retract the plunger.By pulling up on the tensioner by hand with about 18 pounds of force --50 will be exerted at the plunger.When fully retracted insert pin to hold in reracted position.Next check to make sure that cam wedges are holding and no sprocket are trying to move,when satisfied remove one of the rollers at the bottom on the side where you left hand would be standing in front.Pull off belt.Replacement belt will have referance marksone line will go to crank sprocket face up others will line up with other sprocket marks.Reinstall roller followed by tensioner then pull pin you have holding tenioner retracted.Remove wedges.Reinstall covers fans belts.Do not be intimitaded by this replacement.Everything is very easy to get to.Be sure cams are locked and that damage is not done to tensioner and it is straight forward.
Chances are your cam sprocket is off one tooth, bring the engine to Top dead center #1 cylinder firing stroke lining up the flywheel timing pointer notch to the timing marked zero. remove the timing belt cover to check that the timing marks line up if not remove tensioner and reset the sprocket so it lines up then reinstall tensioner recheck.