For 1990-2009 cars

# PART USAGE REVISION/BOLT SIZE AND FASTENER TIGHTENING SPEC.

#### SUBJECT: PART USAGE REVISION/BOLT SIZE AND FASTENER TIGHTENING SPEC CHANGE ON ENGINE MOUNT BRACKET

VEHICLES AFFECTED: 1992-93 "UN" MODELS

ENGINE (VIN) A D 3

#### CONDITION:

A small number (about 2 percent of total production) of early production 1992 model year 2.3L engines with automatic transaxles were produced with M-10 bolts (1 3 mm bolt head) to attach the engine mount bracket (upper) to the engine block. When the engine mount bracket bolts are removed, replace them with new bolts (GM P/N 14034683 with Loctite 75, without substitution). The fastener tightening specification is listed below.

Later production 1992 and all 1993 model year 2.3L engines had M-12 bolts to attach the engine mount bracket (upper) to the block and have different tightening specifications than the M-10 bolt. When the engine mount bracket (upper) bolts are removed, replace them with new bolts (bolt GM P/N 2257961 1, without substitution). Tighten bolts to the specified N.m (lbs. ft.) then rotate the bolt the specified degrees with Torque Angle Meter J- 36660.

BOLT BOLT HEAD PART TRANS TORQUE SPECIFICATION SIZE SIZE NUMBER

M-10 13 MM 14034683 BOLT AUTO 30 N.m (41lbs. ft) Plus rotate 60 degrees M-12 15 MM 22579611 BOLT AUTO 60 Nm (44 lbs. ft) Plus rotate 90 degrees M-12 15 MM 22579611 BOLT MANUAL 110 N.m (81 lbs. ft) Plus rotate 90 degrees

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.