BMW 735i, 735iL, 740i, 740iL, 750iL (E32, 7 Series) Repair Manual 1988-1994

• BMW 735i
• BMW 735iL
• BMW 740i
• BMW 740iL
• BMW 750iL

• 735i, 735iL (M30 - 3.5L engine)
• 740i, 740iL (M60 - 4.0L engine, OBD II)
• 750iL (M70 - 5.0L engine)

• ZF 4 HP 22 EH
• ZF 4 HP 24 EH
• ZF A5S 560Z

• Getrag 260/6

ROCKER ARMS AND ROCKER ARM SHAFTS (M30 ENGINE)

Rocker arms and rocker arm shafts are components that wear and are usually the cause of valve train noise. Although valve train noise may indicate worn rocker arms or rocker arm shafts, valve train noise may also be caused by incorrect valve clearances or other engine wear. Valve clearance adjustment is described above under Valve clearance, adjusting (M30 engine).

NOTE: To replace rocker arms or rocker arm shafts, the cylinder head must be removed. See 113 Cylinder Head Removal and Installation

First check the rocker arm bushings for wear. If the lower part of the bushing is shiny and rough, the rocker arm is worn. A good rocker arm bushing surface will have a dull, smooth finish all around.

Continue checking the rocker arms by installing them on a known good rocker arm shaft. There should be no noticeable play in any direction. The exhaust side rocker arms are the most susceptible to wear.

If the rocker arm or shafts show any visible signs of wear, they should be replaced (see photo).

CAUTION! Some M30 engines produced between September 1992 and April 1993 may have faulty rocker arms installed.

On vehicles so equipped, the rocker arm bushings can slide out of the rocker arms, causing the valves to jam at the rocker arm eccentrics and result in engine damage.

Contact an authorized BMW dealer for vehicle chassis ranges and additional information on this problem.

REMOVING AND INSTALLING

1. Remove exhaust system and heat shields. See 180 Exhaust System.



2. Loosen driveshaft sliding coupling clamping sleeve (see arrow) several turns.


NOTE - BMW special tool 26 1 040 can be used to loosen the clamping sleeve.


3. Using paint or a punch, make matching marks on driveshaft and attaching flanges.



4. Remove nuts and bolts holding flex disc or end joint to transmission flange. Do not pull driveshaft off flange at this time. Note open-end wrench used to counterhold bolt.


NOTE: Removal of the bolts may be made easier by placing a large hose clamp around the flex disc and tightening the clamp slightly to compress the coupling.


5. Remove bolts from driveshaft at final drive flange (see photo).



6. Support driveshaft and remove center bearing mounting bolts.


WARNING! Do not let the rear section rest on the fuel tank connection line.


7. Remove driveshaft. Bend driveshaft down at center bearing, and then pull it off at front. If necessary, slide driveshaft together at splined coupling.