# Group 11 Engine Service bulletins

#### Bulletin number

#### Title

#### Description

#### Date of issue

11 29 82 (688) | Connecting rod modification M10 M30 (superceded by 11 02 94) | Describes differences in connecting rods for the M10 and M30 engines as of May 82 production | August 1983
11 04 83 (732) | M10 Oil pump sprocket | Change in shaft and sprocket design | April 1983
11 05 83 (739) | Rough idle, 318i | Increase plug gap to 0.8mm (0.032") | July 1983
11 06 83 (752) | Rough idle, Gear noise, AC malfunction ICU malfunction 318i | Install AC diode, jump 0° C switch, test system and if necessary, replace idle control unit | October 1983
11 08 83 (772) | Non interchangeability of connecting rods M20 | Describes differences in connecting rods between the Munich and Steyr factories in the M20 engine | September 1983
11 11 83 (788) | Rough Idle / Performance 318i | Reduction of compression and change of distributor, as of Nov 1 1983. | December 1983
11 01 84 (814) | Engine oil pan leaks (replaces 11 07 83 (769) ) | Informs of new style of paper oil pan gasket. | March 1984
11 04 84 (849) | Freeze out plugs | New style of plugs, made from zinc coated aluminum | August 1984
11 05 84 (888) | Engine oil consumption complaint verification and diagnosis | Describes how to handle the diagnosis of excessive oil consumption, and what route to take if it exists | March 1985
11 06 84 (892) | Engine oil drain plug | Use 9mm long bolt thread in steel pan, 18mm in aluminum pan | November 1984
11 07 84 (894) | Coolant hose chafing on lifting bracket, 325e | Install edge guard on lifting bracket. | November 1984
11 08 84 (898) | Engine oil filters | Contains BMW's concerns about incorrect oil filters | October 1984
11 09 84 (905) | Toothed belt tensioning pulley P/N 11 31 1 272 424 | Informs of possible problems with timing belt tensioner pulleys of improper manufacture | March 1985
11 13 84 (926) | Leaky valve cover gaskets, M10, M20 | Replace gasket with metal reinforced version - No longer valid | January 1985
11 15 84 (939) | Engine oil viscosity ( winter operation ) | Simply states to use viscosity listed in the owners manual for your specific temperature. | December 1984
11 04 85 (989) | Crankshaft pulley M20 | Do not use pulleys with "Schroth" on front surface | April 1985
11 05 85 (995) | Ignition timing change 318i | As of May 85 production , ignition timing was increased from 15° @ 2000 rpm, to 26° @ 4000 rpm. | March 1985
11 06 85 (999) | Ignition timing change, Field fix 318i | States to adjust timing to specs of 11 05 85 for pre May 85 vehicles | April 1985
11 07 85 (1000) | Factory production changes as of 12/84 | Lists running production changes in the 318i | April 1985
11 08 85 (1002) | Engine oil leaks, M10 and M30 | Leaks at filter housing caused by high pressure during cold starts. Fix is to replace housing cover. | March 1985
11 10 85 (1011) | Labor Ops for Carbon removal of intake valves | Gives warranty times for carbon removal | May 1985
11 12 85 (1040) | Toothed belt tensioning pulley noisy M20 | Noise more likely from belt or cam gear rather than tensioner. | June 1985
11 15 85 (1056) | All with DME or Jetronic, erratic idle, CO too low or not adjustable | Check for air leaks at valve cover gasket, throttle housing, oil cap, dipstick, vacuum hoses, etc. | September 1985
11 16 85 (1070) | Grooved valve stem seals M10/M20/M30 | Discusses running production change of valve seals. | August 1985
11 18 85 (1097) | Camshaft drive belt replacement M20 M21 | Timing belt replacement intervals | August 1988
11 19 85 (1106) | Cylinder head bolts and valve adjustment | Discusses changes in the cylinder head bolts and revised valve adjustment specs | June 1986
11 01 86 (1149) | Thermostat, housing and cover M20 and M30 | Running production change of thermostat and housing from 1986 model year | July 1986
11 04 86 (1190) | Cylinder head gasket M20 | A change in gasket style in the hope of fixing the oil leak that appears between cylinders 3 and 4. | March 1986
11 05 86 (1190) | Coolant hose retention device M20 | Check for latest style of bypass hose clamp. Install new style that wraps completely around the hose. | June 1986
11 06 86 (1231) | Intermediate shaft and oil pump drive gears M20 | Production change of hardening process for the drive gears | August 1987
11 08 86 (1283) | Camshaft sprocket M20 | Improper flange thickness, produced between 7/86 and 9/86. Replace cam sprocket if stamped with W+P286 on the rear face | February 1989
11 09 86 (1304) | Oil leak at intermediate shaft M20 | Incorrectly seated sealing plug, replace shaft | January 1987
11 11 86 (1320) | Worn valve guide repair | States that replacing valve guides is no longer a fix, guides are to be reamed and an oversized valve used. | April 1988
11 04 87 (1364) | Camshaft sprocket M20 | Discontinuation of sheet metal sprocket, lists extra parts required for installation of replacement sprocket | May 1987
11 05 87 (1419) | Viscous fan clutches | Storage, noise and tightening torque info for fan clutches | October 1987
11 07 87 (1449) | Oil cooler and pipes | 12/86 production only, noise from poorly isolated cooler. | August 1987
11 09 87 (1468) | BMW High performance engine oil | Announces release of BMW engine oil | September 1987
11 11 87 (1514) | Oil pump, 325iX | Lack of pressure at start up due to air lock, after installation of new pump | November 1987
11 05 88 (1742) | Flywheel and attaching hardware change, M3 | Production change in flywheel and bolts. | November 1988
11 02 89 (1820) | Engine oil leakage, 325iX/A 525i/A | Warns of phantom leaks from messy oil filter removal, leaving oil sitting in engine mount cavities | February 1989
11 03 89 (1822) | Engine oil drain plug S14 S38 | Incorrect drain plug length, some got 9mm threads instead of 18mm threads. | February 1989
11 05 89 (1868) | Incorrect dipstick length, M20 12/88 production | Some models got iX dipstick by accident ID number 1 718 863.9 on bottom of stick is correct for all but iX | May 1989
11 07 89 (1876) | Crankshaft main bearing service M20 | Describes changes in crankshaft bearing classifications | May 1989
11 08 89 (1877) | Exchange crankshaft kits, M20 and M70 | Describes bearings supplied with crankshaft kits | March 1990
11 02 90 (3035) | Oil cooler and oil cooler pipes , except M3 | Post 9/87 production, droning noise, install mount kit | June 1990
11 03 90 (3044) | New cylinder head bolts M20 | Replacing hex head bolts with Torx head bolts | April 1990
11 04 90 (3051) | Engine oil cap, all except iX | Weak retaining springs can break, production between 10/89 and 11/89, replace cap | June 1990
11 05 90 (3058) | Tappet noise after cold engine start up | Noise is normal in most cases, replace lifters only if noise continues after 20 minutes | May 1990
11 06 90 (3060) | Sodium filled valves | Proper handling and disposal of these valves | May 1990
11 07 90 (3117) | Throttle housing gasket sealing M3 | Apply a bead of silicone sealer to sealing ridge of gaskets before installing | November 1990
11 09 90 (3137) | Oil filter head leak M20B25 and S!4 | Leaking O ring at filter head in cars fitted with oil cooler. New repair kit, P/N 11 42 9 059 338 | January 1991
11 11 90 (3149) | Engine oil capacities | Lists all vehicles and their oil capacities - contains many mistakes | September 1993
11 01 92 (3484) | Engine hydraulic lock | A bad fuel injector can cause hydraulic lock. Describes procedure for checking and repairing hydraulically locked engine | January 1992
11 05 92 (3574) | Valve cover gasket M42 | Introduces new valve cover gasket that is re-usable and seals better | June 1992
11 02 93 (3749) | Oil pipe hollow (banjo) bolt, M10, M30 and M70 | New micro-encapsulated bolt to help prevent them from backing out. | March 1993
11 10 93 (3885) | Coolant leak from timing case profile gasket, M42 | Introduction of new profile gasket material | November 1993
11 02 94 (3960) | Connecting rod and piston weight classifications | Weight classification is no longer required. All new BMW rods and pistons are now designed to cover all weight classes. Never mix manufacturers parts. | April 1994

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson