Spark Plug Recess - Debris Retention
Number 87-6(Gasoline)-3 Date 10/86Subject: SPARK PLUG RECESS DEBRIS RETENTION
1987 6000 AND SUNBIRD MODELS WITH 2.0L OHC AND 2.8L V6 ENGINES (VIN CODE K, M, W)
Contamination in the spark plug recess is not a new concern for any engine. However, for the above engines with aluminum heads, this collected debris could cause spark plug hole thread damage.
Continued good service practice of dirt removal for this engine, as well as others, during spark plug removal and installation should be maintained. This "extra care" will lessen any unnecessary follow-up engine repairs and hence eliminate dissatisfied customers.
This bulletin is for information only.