TSBs

Gasket Assembly Can Cause BMW Leak

May 9, 2022

If you experience an oil leak from the turbocharger return line on a 2 Series, 3 Series, 4 Series, 5 Series or 6 Series BMW, the leak may be at the exhaust turbo oil return line at the connection to the turbo.

Information courtesy of Mitchell 1,

Mike Mavrigian

Incorrect assembly of the “asbestos-free” gasket may be the culprit. The gasket may be flipped with the bead raised toward the turbo. The gasket should be installed with the bead raised towards the oil return line. Replace the turbocharger oil return line, the asbestos-free gasket and the 16x2mm O-ring.

Correct gasket orientation. The raised bead faces the oil return line (oil pipe outlet).

Oil pipe outlet: P/N 11 42 7 617 535

Asbestos-free gasket: P/N 11 42 7 577 017

O-ring: P/N 11 42 8 604 872

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

About the Author

Mike Mavrigian | Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.