Engine - Valve Lifter Type Noise On Cold Start
Bulletin 87-6-8Date Mar. '87
Ref. No. 87-080-6
Corp. Ref. No. 706004
SUBJECT: VALVE LIFTER TYPE NOISE ON COLD START ONLY
MODELS AFFECTED: 1986-87 MODELS EQUIPPED WITH LG3, 3.8L SFI (VIN CODE 3) ENGINES
Some 1986-87 models with 3.8L SFI, Roller Lifter Engines, built between start of production and mid-January, 1987, may exhibit an audible valve train rattle/lifter type noise on initial cold engine start up. The noise is audible only for a short time and diminishes with engine run time.
A midyear change was made to a .057" longer push rod. The longer push rod is identified with a red paint marking. Early production push rods had a blue paint marking.
While this condition may be an annoyance to the customer, engine durability is not affected.
When diagnosing this condition, make sure the original oil filter (black painted) has been replaced with a PF47 service oil filter, Part Number 25010792. If this condition is not corrected after using currently published diagnostic and service information, install twelve (12) longer push rods, Part Number 25532162.
Use applicable Labor Operation Number and times for push rod replacement.