PART USAGE REVISION/BOLT SIZE AND FASTENER TIGHTENING SPEC.. Oldsmobile Achieva 1992

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

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