BMW Engine >> OIL SEEPAGE FROM THE CYLINDER HEAD
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BMW Engine >> OIL SEEPAGE FROM THE CYLINDER HEAD
Oil Seepage from Cylinder Head On BMW 1991-93 1.8L Engines
The AERA Technical Committee offers the following information regarding oil seepage from cylinder head on BMW 1991-93 1.8L engines. This engine is referred to as M42 and is used in 318 I vehicles.
Oil seepage may occur from the left side of the cylinder head at the lower mounting bolt. The cause of the oil seepage is due to a casting shrinkage
cavity. It is located between the M6 threaded hole for the timing chain tensioning rail mounting and the M8 threaded hole for the intake manifold support
bracket, as shown in Figure 1.
To correct this problem on M42 engines produced since April 1993, the lower bolt for the intake manifold support bracket has been installed with 3 Bond 1209.
It is also marked with a black paint spot.
This repair procedure applies if oil seepage is evident coming from the lower mounting bolt # 1 as shown below. To repair, remove the bolt and degrease
the bolt threads (#2) and bolt hole threads. Then, apply liquid sealing compound 3 Bond 1209, BMW Part # 07 58 9 062 376 on the bolt, reinstall bolt and torque to 12-13 ft/lbs.
The AERA Technical Committee
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