Cylinder Head - Coolant Leak From Right Side

Group 11
Engine

Bulletin Number
11 01 00

Woodcliff Lake, NJ
April 2000
Service Engineering

SUBJECT:
Coolant Leak from Front Right Side of the Cylinder Head

MODEL:
Z3 2.8 and 2.3 with M52TU engines produced from 9/99 - 10/99.
E46 328 and 323 with M52TU engines produced from 9/99 - 10/99E39 528 with M52TU engine produced from 9/99 - 10/99

Situation:
Cylinder heads with a machining flaw (hair line crack) may have been installed on M52TU engines in production on a limited number of vehicles.





The machining flaw (if present) is located in the front right side of the cylinder head and will cause a coolant leak in the area of cylinder 1 as shown in the illustration.

Correction:
Only if a customer complaint is received and a coolant leak is verified coming from the area shown in the illustration above, should the cylinder head be replaced.

Procedure:
Replace the cylinder head and replace all valve stem seals as outlined in the appropriate repair manual, repair group 11 sections 11 12 100 and 11 12 503.





PART INFORMATION





WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.