Bmw m42 engine. The sprockets on the camshafts must be refitted, which way do the arrows point

View this site for help in setting the timing.

• Camshaft alignment/locking tool - BMW No.11 6 320.
• Flywheel locking tool - BMW No.11 8 010 (AT version GM-5).
• Flywheel locking tool - BMW No.11 8 182/11 8 183 (AT version 6HP-19).
• Flywheel locking tool - BMW No.11 8 182/11 8 183/11 8 185 (MT version H).
• Flywheel timing pin - BMW No.11 2 300.
• Timing chain tensioner locking pins - BMW No.11 3 340.

• Here are some general precautions
• Disconnect battery earth lead.
• Remove glow plugs to ease turning engine.
• Turn engine in normal direction of rotation (unless otherwise stated).
• Observe tightening torques.
• Do NOT turn crankshaft via camshaft or other sprockets.
• Do NOT turn crankshaft or camshaft with timing chain removed.

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THESE ARE THE TOOLS U NEED TO HAVE AND PROCEDURE!!GOOD LUCK AND BEWARE THE TIMING..REPLACE BOTH CHAIN AND TENTIONER!!!!!!



















Special tools and workshop equipment required
t Dial gauge -VAS 6079-
t Puller -T10094 A-
t Dial gauge adapter -T10170-
t Camshaft clamp -T10171-
t Counterhold tool -T10172-
t Locking pin -T40011-
t Spark plug spanner -3122 B-
t Counterhold tool -3415-
t Torque wrench (5...50 Nm) -V.A.G 1331-
Procedure
- Remove valve timing housing > Chapter.
- To turn crankshaft, reinstall bearing bush, crankshaft pulley -2- and crankshaft bolt -3- and securely tighten crankshaft bolt (use counterhold 3415).
- Remove spark plug from No. 1 cylinder. Use puller -T10094 A- and spark plug wrench 3122 B.
- Screw dial gauge adapter -T10170- into spark plug hole to stop.
- Screw dial gauge -VAS 6079- and extension -T10170/1- in to stop and lock in position with lock nut -arrow-.
- Turn crankshaft in direction of engine rotation, to TDC No. 1 cylinder. Note position of small needle on dial gauge.
- Then turn crankshaft back 45° opposite direction of engine rotation.
- Press tensioning guide rail -1- in direction of arrow and lock piston with locking pin -T40011-.
- Mark direction of rotation of timing chain -3- using felt-tip marker.
- Remove bolts -2- and remove camshaft sprocket -1- with timing chain -3-. Counterhold using counterhold tool -T10172-.
- Renew bolts -2-. Tighten bolt -2- to 50 Nm (use counterhold -T10172-).
- Turn inlet and exhaust camshafts until camshaft clamp -T10171- can be pushed into holes in camshaft to stop.
Locking pins -arrows 1- must engage in holes -arrows 2-. Inscription "TOP"-arrow 3- must be readable from above.
Note
Camshafts must not be pushed axially whilst turning.
- Install a M6 bolt -arrow- hand-tight (do not tighten) to secure camshaft clamp -T10171-.
- Remove camshaft sprocket bolts. It is absolutely necessary to use counterhold tool -T10172- for this.
Note
Camshaft clamp -T10171- must not be used as a counterhold tool.
- Remove one camshaft sprocket.
- Place timing chain over camshaft sprockets, observing chain direction of rotation, and install camshaft sprocket again.
- Tighten camshaft bolts until camshaft sprockets can still just be turned on camshafts.
- Tension timing chain by removing locking pin -T40011-.
- Turn crankshaft in engine direction of rotation to TDC No. 1 cylinder. Permissible deviation from TDC No. 1 cylinder: ±0.01 mm.
Note
If crankshaft is turned more than 0.01 mm past TDC, then turn crankshaft back 45° against engine direction of rotation. Then turn crankshaft in direction of engine rotation to TDC No. 1 cylinder.
- Hold camshaft sprockets -1- and -4- in this position with counterhold -T10172- then tighten bolts -2- to 50 Nm.
Note
Crankshaft must not move and timing chain -3- must remain tensioned on both sides when tightening camshaft bolts.
- Remove camshaft clamp -T10171-.
- Turn crankshaft two rotations in direction of engine rotation to TDC No. 1 cylinder. Permissible deviation from TDC No. 1 cylinder: ±0.01 mm.
- Insert camshaft clamp -T10171- to stop in camshaft openings.
If camshaft clamp -T10171- cannot be fitted
- Repeat adjustment.
If camshaft clamp -T10171- can be fitted
- Remove camshaft clamp -T10171-, hold camshaft sprockets with counterhold tool -T10172- and tighten bolts -2- a 1/4 turn (90°) further with a rigid wrench.
Note
Camshaft sprockets must not move on camshaft whilst tightening.
- Turn crankshaft two rotations again, in engine direction of rotation, to TDC No. 1 cylinder. Permissible deviation from TDC No. 1 cylinder: ±0.01 mm.
- Insert camshaft clamp -T10171- to stop in camshaft openings.
If camshaft clamp -T10171- cannot be fitted
- Repeat adjustment.
Further assembly is basically the reverse of the dismantling procedure. In the process, note the following:
t Installing valve timing housing > Chapter.
t Installing poly V-belt > Chapter.
t Renew oil seals for camshaft sealing cover and oil them before fitting.

The M42 and M46 engines have the twin vanos pulleys and require locking tools to lock the crank and cam shafts inot the correct position. There are no timing marks on these as they are floating pulleys- ie they have no key locating the pulley in a specific position on the cam. Unless you make accurate marks during stripping there is very little chance you will be able to get the cam timing right on this engine without the cam locking tool kit.

You must use a special tool which bolts onto the cylinder head. It is designed to hold the camshafts in the proper position. It goes over the flats on the camshafts to hold the camshafts in the correct position. This tool can be rented. Look on EBay or check with your local Snap On Tools, Mac Tools, or Matco Tools dealers to rent one. See the link below for photos of properly aligned timing marks for your engine.

1994 BMW M42 timing chain alignment marks Google Search

The 3Y is a Toyota engine used in the Rocky/Rugger.
Setting up valve timing you need to set the no.1 cylinder on TDC on the compression stroke.
Turn the crank until the piston is at the topmost point of its travel. Determine this by inserting a plastic or wood dowel in the plug hole and watching it travel upward. Be careful that it does not snag.
At TDC the mark(see red arrow on diagram) on the crank sprocket will be at the lowest point(If the sprocket has been removed the set key -see blue arrow- will be at the topmost point)
Turn the camshaft so that the set key is at the topmost point and aligns with the mark on the engine. If the sprocket has not been removed, remove it now.
On the timing chain you will find 2 links that are lighter in color than the others. These 2 links have to be aligned with the marks on the sprockets before refitting the sprockets to the shafts.

Timing marks on the 3L motor are: (looking from the front of the engine) right side camshaft sprocket (1 dot on sprocket and the cylinder head); left side camshaft sprocket (1 dot on sprocket and clyinder head); crankshaft sprocket (arrow on the block and an inverted arrow on the face of the sprocket) and of course the timing belt cover

Each gear has an arrow and a dot. The chain should have two differently colored links. Position the crankshaft sprocket so the arrow is pointed up with the dot to your right. Position the camshaft sprocket with the arrow pointed straight down at the crankshaft sprocket and it's dot should also be to the right. The colored links on the chain should be lined up with the dots.

Remove the cam cover, remove the spark plugs, turn the engine to number 1 TDC, put a pencil in spark plug hole number one and twist the crank back and forth and make doubly sure you are at TDC. Now loosen the four bolts at the front of each cam sprocket, check TDC again with the pencil and rocking the crank, now take the pencil and lay it across the flats at the back of each cam. Twist the cams very carefully so that the pencil sits flat on each cam square. Snug up the sprocket bolts and use the pencil to check TDC again! Now check the cams again. Repeat the procedure until you have the cams flat and the engine at TDC.

to do it correctly you need a tension gauge, however it is possible without. make sure your timing marks are correct,flywheel locked and camshaft locking tool in place. slacken camshaft sprocket bolt and turn clockwise to stop. fit timing belt in an anticlockwise direction starting at the crankshaft, ensure belt is taught on the non tensioned side between sprockets. turn tensioner pully anticlockwise, untill you can turn belt 90 degrees with finger and thumb pressure. tighten tensioner. tighten camshaft sproket bolt to 63nm. Remove all locking tools. turn engine 2 revolutions from the crankshaft pulley by hand. DO NOT START AT THIS STAGE!!!!!!!! refit all locking tools, if at any stage the engine locks or the tools will not refit, you have done something wrong. Go back to stage one. Check belt tension finger and thumb method, retension as required. turn again by hand. re fit all components and start. If you have whining noises the tension is too tight. Flapping or banging noises too loose. This is not a fool proof method and you have to be aware of the failings of fitting timing belts without the correct tools etc. ENGINE DAMAGE WILL OCCUR IF FITTED INCORRECTLY. A good garage should charge no more than 2.5 hours for this work to be carried out, with a warranty. Hope this helps