BMW 3 Series Service Manual (E39)

Cylinder Head and Valvetrain

NOTE-

The camshaft bearing caps are coded with a letter and a number. For example, "A1" isthe first exhaust camshaft

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 'XA7sfor 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-

4 Remove lower camshaft bearing carriers from cylinder head.

CAUTION-

Camshaftbearing carriers must be reinstalledin 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.

Camshaftsand lifters,installing(M52TU and M54engine)

Lubricate camshafts,camshaft carriers, bearing caps, hydraulic lifters, friction washers,splined shafts and spline hubs with assembly lubricant before installation.

CAUTION-

Make sure the crankshaft, which had been rotated approximately 30"opposite the direction of engine rotation from TDC,is stillin thatpositionbefore lowering the camshaftsinto 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 camshaft carriers. Place intake camshaft on camshaft carrier.

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ICylinder 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.

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Cylinder Head and Valvetrain

Double VANOS timing chain components

1. Impulsewheel 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

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Cylinder Head and valvetrain1

Double VANOS secondary timing chain components, installing (M52TU, 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

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4 While maintaining tension on timing chain, rotate crankshaft at vibration dampener from 30" before TDC in direction of rotation (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 portion of studs into camshaft.

Tightening torque

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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 adjustableprimary 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~ngstuds (arrows) in exhaust camshaft.

Tightening torques

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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 notalter 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 carnshaft 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.

Initiallytighten 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 Fmarlc is no longer visible, installspring plate as shown in inset.