Honda Bmw 5 Service Manual
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Cylinder Head and Valvetrain NOTE- The camshaft bearing caps are coded with a letter and a number. For example, A 1 is the first exhaust camshaft bearing cap at the front of the engine, and El is the intake camshaft bearing cap at the front of the engine. -. - The camshafts are stamped with a code letter - E for the intake side and X for the exhaust side. E is for Einlap. (German for intake) and XA7s for Auspuff. (German for exhaust). - Repeat procedure for exhaust camshaft < Secure hydraulic lifters in lifter bores using BMW special tool 11 3 250, or remove lifters using a magnetic pick-up tool. I CAUTION- Used liydraulic lifters must be reinstalled in original lifter 1 bores. 4 Remove lower camshaft bearing carriers from cylinder head. CAUTION- Camshaft bearing carriers must be reinstalled in their original locations (E for intalce and A for exhaust). NOTE- Do not allow hydraulic lifters to fall out of camshaft carriers. Hydraulic lifters should be stored in an upright position. Camshafts and lifters, installing (M52TU and M54 engine) Lubricate camshafts, camshaft carriers, bearing caps, hy- draulic lifters, friction washers, splined shafts and spline hubs with assembly lubricant before installation. CAUTION- Make sure the crankshaft, which had been rotated approxi- mately 30 opposite the direction of engine rotation from TDC, is stillin thatposition before lowering the camshafts into position. Allpistons must be out of TDCposition to prevent valve/piston inteiference when the carnshafis are installed. - Lift timing chain and place exhaust cam onto exhaust cam- shaft carriers. Place intake camshaft on camshaft carrier.
11 6-26 I Cylinder Head and Valvetrain 4 Before installing camshaft carriers, examine bearing bores (arrows) on hydraulic lifter bores for signs of wear. Install camshaft carriers with hydraulic lifters into cylinder head. Note marks on carriers: (E) for intake side and (A) for exhaust side. 4 Center camshaft carrier on pins (arrows) at bearing aositions 2 and 7.
-- - . .- -, Cylinder Head and Valvetrain 4 Rotate camshafts so that intalte and exhaust lobes for cylin- der 1 face each other (arrows). CAUJION- A minimum waiting time is required for the hydraulic lifters to bleed downafter installing the camshafts into the cylinder head, before bringing the piston to TDC. When the camshafts are removed, the hydraulic lifters can expand. This expan- sion can cause increased valve lift when the camshafts are bolted down, possibly resulting in piston interference. Place bearing caps on cams, but do not install retaining nuts. 4 Fit BMW special tool 11 3 260 (A) and 11 3 270 (B) to cylinder head over intalte camshaft and screw long bolts (arrows) into spark plug threads. CA UTION- Do not overtighten bolts into spark plug holes. < Turn eccentric shaft of special tool to pretension bearing caps. Install and torque nuts on intake camshaft bearing caps. Tightening torque Camshaft bearing cap to cylinder head (M7) 14 Nm (10 it-ib) - Release tension on eccentric shaft and remove BMW special tools 11 3 2601270. - Repeat procedure for exhaust camshaft. NOTE- Observe waiting time for lifter bleed down before continuing with camshaff installation. Crankshaft I valve timing waiting times 68°F (20°C) and higher 5 minutes 50-6S°F(10-20°C) 15 minutes 32-50DF(O-10°C) 30 minutes
11 6-28 Cylinder Head and Valvetrain Double VANOS timing chain components 1. Impulse wheel mounting nut 2. Exhaust camshaft impulse wheel 3. Spring plate, exhaust 4. Thrust spacer (T = 3.5 mm) 5. Splined shaft 6. Torx screw 7. Exhaust camshaft secondary sprocket 8. Secondary timing chain 9. Splined sleeve 10. Primary sprocket 11. Threaded stud 12. Secondary chain tensioner 13. Secondary chain lower guide 14. Sprocket mounting nut 15. Spring plate, intake 16. Splined shaft 17. Intake camshaft sprocket 18. Locating stud 19. Thrust spacer 20. lntake camshaft impulse wheel
-- Cylinder Head and valvetrain1 Double VANOS secondary timing chain components, installing (M52 TU, M54 engine) < Secure camshafts in TDC position using BMW special tool set 11 3 240. 4 If necessary, turn camshaft so that special tools are squarely seated on cylinder head. 4 Lift timing chain and hold under tension
~ ~. -- Cylinder Head and Valvetrain .- 4 While maintaining tension on timing chain, rotate crankshaft at vibration dampener from 30 before TDC in direction of ro- tation (clockwise) until number 1 cylinder is at TDC position with line between the OIT mark (arrow) on front pulley aligned with boss on lower timing chain cover. 4 Secure crankshaft in TDC position with BMW special tool 11 2 300 (arrow). Slide impulse wheel on intake camshaft, aligning boss with raised portion on camshaft (arrow). Fit thrust spacer (A) to intalte camshaft and tighten down with threaded locating studs (arrows). Place longer threaded por- tion of studs into camshaft. Tightening torque Impulse wheel studs to intake camshaft (M7) 20 Nm (15 ft-lb)
11 6-31 Cylinder Head and Valvetrain < Install primary timing chain on timing chain sprocket and place on exhaust camshaft so that pointer on sprocket (arrow) lines up with cylinder head sealing surface. 4 Insert BMW special tool 11 4 220 into timing chain tensioner bore and bring center spindle into contact with tensioning rail. Tighten until slack is removed, but do not pretension timing chain. NOTE- BMW special tool 11 4 220 is an adjustable primary chain tensioner and simulates the function of the tensioner. - Recheck arrow on primary sprocket is aligned with upper edge of cylinder head. Reposition sprocket if necessary. 4 Insert and tighten threaded locat~ng studs (arrows) in ex- haust camshaft. Tightening torques Exhaust camshaft locating stud 20 Nm (15 ft-lb)
11 6-32 Cylinder Head and Valvetrain 4 Install secondary chain tensioner (arrows). Keep tensioner compressed using BMW special tool 11 3 292 or suitable pin. 4 Fit exhaust camshaft splined sleeve. Confirm that gap in sleeve splines aligns with corresponding gap in carnshaft splines (arrows). Slide splined shaft onto exhaust camshaft so that locating tooth of shaft fits into spline gaps of camshaft and splined sleeve (arrows). - Push splined shafl in further to rotate splined sleeve until the three threaded holes in primary chain sprocket are centered in the small slots of the splined sleeve.
Cylinder Head and valvetrain1 < Place intake and exhaust sprockets in BMW special tool 11 6 180. Position spline gap on intake sprocket (arrow) as shown and place secondary chain on sprocitets. < Remove chain and sprockets from tool and slide sprockets on camshafts. Confirm that gap in intalte sprocket splines lines up with corresponding gap in camshaft splines (arrow). CAUTIOI\C Do not alter position of sprockets with respect to chain when removinq from saecial tool 11 6 180. 4 While aligning locating tooth of shaft with spline gaps on camshaft and sprocket, slide spiined shaft onto intalte carn- shaft until approx. 1 mm (0.04 in.) of splines (arrows) are visible. 4 lnstall intake camshaft spring plate so that FRONT mark is visible. install mounting nuts (arrows) finger tight.
/Cylinder Head and Valvetrain 4 Insert sprocket mounting bolts (arrows) on exhaust side carnshaft assembly. Initially tighten to approx. 5 Nrn (44 in-lb) and then back off by half a turn. 4 Fit thrust spacer (A) on exhaust camshaft. 4 Install spring plate (A) to exhaust camshaft. Make sure that (F) mark is visible. NOTE- If F marlc is no longer visible, install spring plate as shown in inset.