RA Replacing camshaft (M50 VANOS)
RA Replacing camshaft (M50 VANOS)
RA Replacing camshaft (M50 VANOS)
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11 31 001 <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>)(Intake or exhaust side, as applicable)The intake and exhaust <strong>camshaft</strong>s can be changed in thevehicle.Caution!Incorrect removal/installation without help of fixture coulddamage or break the <strong>camshaft</strong>. Valves could also be bentthrough contact with the piston crowns. Always noteinstallation instructions and use specified special tools,procedures, and sequences.Removal:Removal of <strong>camshaft</strong> is described separately from installation.Assembly sequence for removal and installation is different.Removing <strong>VANOS</strong> adjustment unit,refer to 11 36 010Remove the loosened screws from the exhaust sprocket wheel.Unfasten nuts from intake <strong>camshaft</strong>.<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 1 -
Version without plate springRemove thrust washer (1).Version with plate spring(1) Thrust washer approx. 4 mm thick(2) Plate spring(3) Thrust washer approx. 2 mm thickRemove thrust washers and plate spring.Remove sprockets together with chain.Unscrew thrust washer bolts.Remove thrust washer.<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 2 -
Remove sensor gear.Unscrew secondary chain tensioner.Unscrew chain guide.Caution!Strong spring force.Unfasten screw plug (3) from chain tensioner.Remove spring (2) and piston (1).<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 3 -
Lift off sprocket with chain.Protect timing chain to prevent it from falling.Caution!To prevent damaging valves when fitting the <strong>camshaft</strong>s, nopistons should be in TDC position.Pull back special tool 11 2 300 (setting mandrel) until theflywheel is no longer located in position.Lift timing chain and hold under tension.Rotate engine counter-enginewise approx. 30° using the centralscrew.Unscrew studs.<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 4 -
Prepare special tool 11 3 260.Fit special tool 11 3 260 to cylinder head and screw into sparkplug threads in cylinders 1 and 4.Tightening Torque,refer to Technical Data 12 12 1AZCaution!Bearing cover 1 on intake <strong>camshaft</strong> is centered on hollowdowels.To prevent the intake <strong>camshaft</strong> from tilting in the bearingstrip, remove bearing cover 1.Turn the eccentric shaft to pre-tension the bearing caps.Unfasten nuts on bearing cover.<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 5 -
Note centering dowels on retaining pins at bearing points 2and 7.Install bearing strips.If necessary, replace splined shaft in intake <strong>camshaft</strong>.Clamp <strong>camshaft</strong> with protective vice jaws.Remove splined shaft.Installation:Tightening Torque,refer to Technical Data 11 31 5AZInstall <strong>camshaft</strong>s.Camshafts can be identified by the marks on the sprocketflanges.A = Exhaust <strong>camshaft</strong>E = Intake <strong>camshaft</strong>Identification of <strong>camshaft</strong>s:AC = Exhaust <strong>camshaft</strong> <strong>M50</strong> B20EC = Intake <strong>camshaft</strong> <strong>M50</strong> B20<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 7 -
Identification of <strong>camshaft</strong>s:AD = Exhaust <strong>camshaft</strong> <strong>M50</strong> B25ED = Intake <strong>camshaft</strong> <strong>M50</strong> B25InstallationInstallation of <strong>camshaft</strong> is described separately from removal.Assembly sequence for removal and installation is different.Caution!The bucket tappets expand when not subjected to load bythe <strong>camshaft</strong> and therefore require some time before theycan be pushed back down. During a rapid assemblysequence, the "closed" valves may still be open and be incontact with the piston.You must adhere to the following waiting periods after installingthe <strong>camshaft</strong> and before cranking the engine back to the TDCposition.- Room temperature (20°C) 4 mins- 10°C ... 20°C 11 mins- 0 °C ... 10 °C 30 mins<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 8 -
Install <strong>camshaft</strong>s with tips on intake and exhaust valves pointingtowards 1st cylinder.Fit bearing cover.Note:The bearing covers are clearly marked and can be read fromthe exhaust end:A1 ... A7 for the exhaust endE1 ... E7 for the intake endFit special tool 11 3 260 to cylinder head and screw into sparkplug threads in cylinders 1 and 4.Tightening Torque,refer to Technical Data 12 12 1AZTurn the eccentric shaft to pre-tension the bearing caps.Tighten down bearing cover.Tightening Torque,refer to Technical Data 11 31 1AZRemove special tool 11 3 260.<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 9 -
Caution!Do not damage the cylinder head.Machine open-end wrench accordingly if necessary.Align <strong>camshaft</strong>s with open-end wrench.Fit special tool 11 3 240 to <strong>camshaft</strong>s on cylinder 6.Note:Camshaft adjustment is correct if special tool 11 3 240bears on the cylinder head without gaps.Lift timing chain and hold under tension.Rotate engine from the 30° before TDC position engine-wise upto TDC position.Secure crankshaft in TDC position with special tool 11 2 300.Caution!Remove special tool 11 2 300 (plug mandrel) beforeswitching on the engine.Fit primary timing chain to sprocket.Fit sprocket to exhaust <strong>camshaft</strong> with threaded bores on left sidealigned down the deep bores.<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 10 -
Install special tool 11 3 390 in chain tensioning sleeve (1).Screw in the adjusting screw to touch the bow cover, but do notyet tighten it.Note:Long bores in sprocket wheel are centered over threadedbores.Install chain guide.Install secondary chain tensioner.<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 11 -
Version with plate springInstall nuts and tighten down.Tightening Torque,refer to Technical Data 11 31 11AZVersion without plate springFit thrust washer (1) to the intake <strong>camshaft</strong>.Version without plate springTighten down thrust washer (1) with nuts.Tightening Torque,refer to Technical Data 11 31 11AZFit shim and screws to the exhaust <strong>camshaft</strong>.Fit screws with zero backlash: sprocket remains able to move.<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 14 -
Installing <strong>VANOS</strong> adjustment unit,refer to 11 36 010Assemble engine.<strong>RA</strong> <strong>Replacing</strong> <strong>camshaft</strong> (<strong>M50</strong> <strong>VANOS</strong>) BMW AG - TIS 26.08.2005 15:15Issue status (02/2004) Valid only until next CD is issued Copyright Page - 15 -
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