Honda Bmw 5 Service Manual
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- Camshaft Timing Chain -. - 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- If the adjustment travel is less than 8.5 mm the VANOS ad- justment unit must be removed and readjusted. See VANOS control unit, removing (M52 engine) and VANOS con- trol 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 en- gine oil pan removal. Special BMW sewice tools are needed for timing chain re- moval and installation procedures. The special tools assure propertiming of thevalvetrain. Precise marks to 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 con- tact the valves. - Remove VANOS control unit. See VANOS control unit, re- moving (M52 engine). - Remove radiator cooling fan and shroud. See 170 Radiator and Cooling System. - Drain cooling system. See 170 Radiator and Cooling Sys- tem. - 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 re- move 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. Crankshaft hub retaining bolt is torqued to 410 Nm (300 ft-lb). Do not use flywheel locliing tool to hold cranl(shait stationary to loosen or tighten crankshaft hub center bolt. Use only the special tools specified, or equivalent hub holding tool. - Remove crankshaft hub. - Remove cylinder cover mounting fasteners and remove cyl- inder head cover. NOTE- The cylinder head cover mounting bolt insulators and gas- lets 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- Timing chain tensioner is under spring tension. I - Remove VANOS control unit. See VANOS control unit, re- moving (M52 engine). - Remove fasteners from intake and exhaust camshaft sprocket.
[camshaft Timing Chain < While pressing down on secondary timing chain tensioner install locking tool (BMW 11 3 292) or a similar pin. NOTE- Two types of secondary timing chain tensioners are used, with either two holes (shown) or a single hole for the locking pin tool. - Remove intake and exhaust sprockets together with secondary chain. < Remove secondary timing chain tensioner bolts (arrows) and remove tensioner. - Remove primary timing chain sprocket from exhaust camshaft. - Remove sprocket and hang timing chain from end of exhaust camshaft. 4 Remove secondary chain guide bolts (arrows) and remove guide.
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.
1 17-30 I Camshaft Timing Chain Timing chain, installing (M52 engine) CAUTION- The procedure outlined below assumes that the camshafts and the crankshaft are 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 on exhaust camshaft. to crankshait sprocket and hang 4 Apply a small bead oi silicon sealer (Three Bond 1209 @or equivalent) to corners where tim~ng cover meets cylinder head (arrows).
Camshaft Timing chain1 Tap locating dowels into cover until they protrude 2 to 3 mm from sealing surface. - Using new gaskets, install lower timing chain cover: Tap cover into position to engage dowels. Install timing chain cover fasteners and tighten to 5 Nm (44 in-lb). Drive dowels in flush to front of cover. . Tighten cover mounting bolts alternately and in stages. Install cylinder head to timing chain cover fasteners and tighten. Tightening torques Lower timing chain cover to block M7 15 Nm (1 1 ft-lb) ME 20 Nm (15 it-lb) - Replace front crankshaft radial seal. See Crankshaft oil seal, front, replacing (M52 engine). Install engine oil pan using a new gasket. See 119 Lubrica- tion System. Mount primary timing chain sprocket to primary cha~n so that arrow on sprocket faces up. Mount sprocket to camshafl so that tapped holes in camshaft are on left side of elongated holes in sprocket. 4 Install adjustable timing chain tensioner (BMW special tool 11 4 220). Thread tool in finger tight until slack is removed from chain. NOTE- BMW special tool 11 4 220 is an adjustable timing chain ten- sioner that simulates the function of the hydraulic tensioner. - Check that elongated holes in primary sprocket are centered to bolt holes in camshafl and chain is free of slack. - Install secondary timing chain guide and secondary chain tensioner. Tighten mounting bolts (tensioner remains locited down). F81.,,l,ryT-iib.l>nii,:oni-Aii Riilti R
-- - Chain 1 - Install cylinder identification trigger plate to front of intake camshaft. - Install spacer to front of intake camshaft - Install secondary chain sprockets and chain as an assembly so that arrows on sprockets are pointing up. Center mounting holes in sprockets to bolt holes in camshafts. 4 lnstall thrust washers and spring plate to intake cam sprocket. Tighten intake camshaft sprocket nuts. - Install VANOS control unit, see VANOS control unit, install- ing (M52 engine). Tightening torque Intake camshaft sprocket nuts to studs (ME) 1011 Nm (8919 In-lb) 502117068 - Unlock and release secondary chain tensioner, 4 Preload primary timing chain by torquing adjustable primary chain tensioner (BMW special tool 11 4 220) to 1.3 Nm (11 in-lb). - Tighten exhaust camshaft sprocket bolts in two stage Tightening torque Exhaust camshaft sprocket bolls (M7) Stage 1 5 Nrn (44 in-lb) Stage 2 22 Nm (17 ft-lb) - Remove crankshaft locking tool and camshaft locking tools. < Align hub with keyway and tap into place. Insert new center bolt with washer shoulder (arrow) facing hub. CAUTION- Inspect woodruff ley for damage before installing hub. - Attach crankshaft holding tool (BMW special tools 11 2 15011 1 2 410) to hub. Counterhold hub with tool while tight- ening center bolt. CAUTION- Do not use flywheel locling tool to hold crankshaft stationary to loosen or tighten cranlshaft hub center bolt. Use only the special tools specified, or equivalent hub holding tool.
-- Camshaft Timing Chain -- - Tightening torque Vibration damper hub to crankshaft 410 Nm (300 ft-lb) 4 Install cranltshaft hub and vibration damper while aligning locating hole (arrow) in damper with dowel pin in hub. Tightening torque Vibration damper and pulley to cranltshaft hub 22 Nm (17 ft-lb) - 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 pis- ton engages chain rail. Tightening torque 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 Cylinder head cover to cyiinder head 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 Upper timing chain cover to cylinder head M6 nut 10 Nm (89 in-lb) MB bolt 22 Nm (17 ft-lb) VANOS oil supply pipe to VANOS control unit banjo bolt 32 Nm (24 ft-ib)
1 17-34 1 Camshaft Timing Chain DOUBLE VAMOS 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 cam- shaft 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 inter- nallexternal 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 po- sition signal, intake air and coolant temperature.