BMW 3 Series Service Manual (E39)
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Camshaft Timing Chain
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Measure gap (B) between secondary timing chain tensioner and intake camshaft sensor wheel. Make note of distance.
To determine VANOS control travel:
Distance I3 -distance A = a minimum of 8.5 mm
CAUTION-
I f the adjustment travelis less than 8.5 m m the VANOS adjustment unitmustbe removedandreadjusted.See VANOS control unit, removing (M52 engine) and VANOScontrol unit, installing (M52 engine).
Remove special tools:
Cranltshaft locking tool.
Camshaft loclting tool set.
Air fitting.
*VANOS cable adaptor.
-Install VANOS oil line with new seal
-Install oil baffle cover above intake camshaft.
-Install cylinder head cover mounting studs to rear of head.
-Install cylinder head cover, Tightening torques
Cylinder head cover |
10 Nrn (89 in-lb) |
VANOS oil line |
32 Nm (24 R-lb) |
VANOS solenoid to control unit |
30 Nrn (22 ft-lb) |
- Installation of remaining parts is reverse of removal.
Camshaft Timing Chain
Timing chains, removing (M52 engine)
Camshaft timing chain removal on M52 engines requires engine oil pan removal.
Special BMW sewice tools are needed for timing chain removal and installation procedures. The special tools assure propertimingof thevalvetrain. Precise marksto setthe timing on the camshafts are not provided for reassembly. Read the procedures through before beginning the job.
NOTE-
If the camshafts are not properly timed, the pistons can contact the valves.
-Remove VANOS control unit. See VANOS control unit, removing (M52 engine).
-Remove radiator cooling fan and shroud. See 170 Radiator and Cooling System.
-Drain cooling system. See 170 Radiator and Cooling System.
-Remove coolant hoses from thermostat housing and remove thermostat housing from front of cylinder head.
-Loosen bolts for coolant pump pulley.
-Remove drive belts for alternator and AIC compressor. See 020 Maintenance.
-Remove coolant pump pulley.
Remove drive belt tensioner mounting bolts (arrows) and remove tensioner from front of engine.
-Remove engine speed sensor from lower timing chain cover.
4 With crankshaft at TDC position, remove vibration damper bolts (arrows)and remove vibration damper.
<Mount crankshaft holding tool (BMW special tool 11 2 150 and 11 2 410)to crankshaft hub. Counter hold crankshaft and loosen crankshaft hub retaining bolt.
Crankshafthub retaining bolt is torqued to 410 Nm (300ft-lb). Do not use flywheel locliing tool to hold cranl(shaitstationary to loosen or tighten crankshaft hub center bolt. Use only the special tools specified, or equivalenthub holding tool.
-Remove crankshaft hub.
-Remove cylinder cover mounting fasteners and remove cylinder head cover.
NOTE-
The cylinder head cover mounting bolt insulators and gaslets should be reinstalled in their original positions. Make note of their arrangement during removal.
-Drain engine oil, remove oil pan. See 119 Lubrication Sys- tem.
Remove primary timing chain tensioner (arrow).
CAUTION- |
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Timing chain tensioner is under spring tension. |
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-Remove VANOS control unit. See VANOS control unit, removing (M52 engine).
-Remove fasteners from intake and exhaust camshaft sprocket.
Camshaft Timing chain1
Using a drift, drive two locating dowels (arrows) in lower timing cover toward rear of car.
4 Remove timing cover mounting bolts (arrows).
* Carefully slide cover with water pump forward to remove
CAUTION-
Use care when removing the cover from the cylinder head gasket If the cover is stuck, use a sharp knife to separate it from the head gasket.
If cylinder head gasket is damaged, remove cylinder head and replace head gaslet. See 113 Cylinder head and valvetrain.
-Remove timing cover locating dowels by driving them forward.
-Lift primary chain sprocket off crankshaft sprocket and remove chain.
117-30
ICamshaft Timing Chain
Timing chain, installing (M52 engine)
CAUTION-
The procedureoutlinedbelowassumes that the camshafts andthe crankshaftare lockedin the TDCposition with BMW special tools.
-Inspect timing chain and sprocltets and guide rails for wear. Replace worn parts.
NOTE-
If any of the sprockets are being replaced due to wear, the chain should also be replaced.
Install primary timing chain to crankshait sprocket and hang on exhaust camshaft.
4 Apply a small bead oi silicon sealer (Three Bond 1209 @or equivalent) to corners where tim~ngcover meets cylinder head (arrows).
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Camshaft Timing Chain |
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Tightening torque |
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Vibration damper hub to crankshaft |
410 Nm (300 ft-lb) |
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4 Install cranltshaft hub and vibration damper while aligning |
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locating hole (arrow) in damper with dowel pin in hub. |
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Tightening torque |
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Vibration damper and pulley to |
22 Nm (17 ft-lb) |
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cranltshaft hub |
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-Turn engine over by hand in direction of rotation at least two full rotations. Reinstall camshaft and crankshaft locking toois to recheck engine timing. Remove locking tools if no faults are found.
-Remove BMW special tool 11 3 390 (dummy tensioner) from side of cyiinder head.
-Install primary chain tensionerso that cutout in tensioner piston engages chain rail.
Tightening torque |
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Timing chain tensioner to tensioner sleeve |
70 Nm (52 ft-ib) |
-Install cylinder head cover mounting studs, camshaft cover, and cylinder head cover.
Tightening torque |
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Cylinder head cover to cyiinder head |
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M6 nut |
10 Nm (89 in-lb) |
MB bolt |
22 Nm (17 ft-lb) |
- installation of remaining parts is reverse of removal, noting the following:
When installing thermostat, make sure arrow or vent hole faces up, if applicable.
Refill cooling system as described in 170 Radiator and
Cooling System.
Fill engine with oil and install new oil filter as described in 020 Maintenance.
Tightening torque |
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Upper timing chain cover to cylinder head |
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M6 nut |
10 Nm (89 in-lb) |
MB bolt |
22 Nm (17 ft-lb) |
VANOS oil supply pipe to VANOS control |
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unit banjo bolt |
32 Nm (24 ft-ib) |
117-34
1Camshaft Timing Chain
DOUBLEVAMOS SYSTEM
(M52 TU AND M54 ENGINES)
Double VANOS system function
The M52TU and M54 6-cylinder engines are equipped with a Double VANOS system that varies intake and exhaust camshaft timing.
The main components of the Double VANOS system are:
lntalte and exhaust camshafts with helical spline inserts.
Camshaft sprockets with adjustable gears.
VANOS actuators (two position piston housing with internallexternal helical spline cup).
Three-way solenoid switching valves.
Camshaft position impulse wheels.
Hall effect camshaft position sensors.
Camshaft position IS varied based on engine rpm, throttle position signal, intake air and coolant temperature.