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Crankshaft Main Bearing Seal: Customer Interest
Engine - Oil Leak by Crankshaft Oil Seal
911 (996)
2/04
Binder - 1, Engine Part 1
This bulletin replace bulletin Group 1, Part 1, # 2/04, dated 6-25-04.
Engine Oil Leak By Crankshaft Seal (Flywheel Side)
Vehicle Type:
911 Carrera (996)
911 Carrera 4 (996)
Model Year:
As of '99 (X)
Concerns:
Engine oil leaks in area of crankshaft sealing ring on flywheel side may be coming from the crankcase and intermediate-shaft flange bolts.
Filing:
Replace Technical Bulletin Group 1, Part 1, # 2/04 dated 6-25-04 that is filed in the Technical Manual with this one.
Information:
Examination of engines that were the subject of complaints revealed other oil leaks in addition to those found in the crankshaft sealing ring on the
flywheel side. These engine oil leak areas included:
>
crankcase bolt threads
>
intermediate-shaft flange area.
Since March 9, 2004, bolts with a sealant coating on the thread and head have been used during assembly to fasten the crankcase halves in the area of the
flywheel.
On vehicles manufactured prior to the above-mentioned date (See Introduction), the four crankcase bolts and the three intermediate shaft flange bolts
must be replaced in addition to the crankshaft sealing ring in the event of an oil leak in the area.
Engines replaced for this reason under warranty will be subject to a charge back and the engine returned to the dealer.
The work procedure for replacing the affected fastening bolts is described.
Introduction:
Introduction of the coated fastening bolts on the crankcase: March 9, 2004, from the Engine # S shown.
Parts Information
Work Procedure:
This is a source reference. Confirm exact model applicability in the original material.