OIL PAN GSK.FLUID LEAKS NEW CELLULOSE OIL PAN GSK.

MODEL AND YEAR: PASSENGER CARS WITH THM 200C OR THM 200-4R EL CAMINOS WITH THM 200C OR THM 200-4R

TO: ALL CHEVROLET DEALERS

A new latex-coated cellulose (hard fiber material) pan gasket enter production on the dates listed below. The new gaskets improve sealing capability by better withstanding fastener torques.

Date of Production Change: (See Illustrations)

THM 20OC: May 29, 1986, Julian Date 149 THM 200-4R: June 23, 1986, Julian Date 174

Any model year THM 200C and 200-4R transmissions with a continuous raised rib pan can be serviced with the new cellulose gaskets. When servicing a THM 200C or THM 200-4R which has the former flat surface pan, refer to Chevrolet Dealer Service Bulletin 83-117 Section 7A dated Dec., 1983 or Chevrolet Dealer Service Bulletin 64-107 Section 7A dated April, 1984 (THM 200-4R) which review installation of a raised rib pan.

Some service overhaul packages may contain a latex-coated cork (soft material) gasket, which should not be used with a raised rib pan. The new hard fiber material gasket can be ordered separately using the appropriate part number listed below.

SERVICE PARTS INFORMATION

THM 200C Gasket Trans. Oil Pan (Cellulose) P/N 8648529 THM 200-4R Gasket Trans. Oil Pan (Cellulose) P/N 8657387

When replacing the oil pan gasket it is critical that a torque wrench is used to tighten the hex head pan screws. Hand torque all THM 200-4R hex head screws 8-14 N.m. (6-10 lb. ft.) and all THM 200C hex head screws 10-16 N.m. (7-12 lb. ft.). This is a new torque specification for the oil pan bolts on the THM 200C.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.