944 S2 Cabriolet L4-2990cc 3.0L DOHC (1991)
Spark Plug: Technical Service Bulletins
Spark Plugs - Install With Threads Clean and Dry
June 14, 1991
Model
Group
All
2
Part Identifier
Number
2870
9102
Subject:
Spark Plug Thread Lubrication
ATTENTION: Service manager/Service Technician
This bulletin supercedes Technical Bulletin Group 28, Number 78-03, Book A, page 297.
Models Affected:
All
Concern:
Spark plug thread lubrication.
Service Information:
The Carrera 2/4 Workshop Manual Vol. 1, page 03-11, in the section on replacing spark plugs states "Do not use
any lubricant on the (spark) plug threads."
This procedure now applies retroactively to all Porsche models. All spark plugs should be installed with the
threads clean and dry.
The torque specification is unchanged:
25-30 N-m (19-22 ft.lb.).