TSB 93-6-15: Cylinder Head Gasket & Bolt - Revised Torque Procedure

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Bulletin Number: 93-6-15 Reference Number: 276113 Publish Date: 11/92 Subject: NEW CYLINDER HEAD GASKET /BOLTS/TIGHTENING PROCEDURE; SERVICE MANUAL UPDATE Models Affected: 1992-93 GRAND AM MODELS VIN A/D/3 (RPO LGO/LD2/L40) ENGINE APPLICATION: 2.3L (RPOs LGO, LD2, and L40) DESCRIPTION: Cylinder head gaskets designed for the 1992-93 2.3L engines require different fastener tightening specification. Later model 1993 2.3L engines have a new cylinder head bolt design and require a new fastener tightening specification. The new bolts can be identified by the captured washer and the threads that continue for the length of the bolt (refer to Figures 2 and 3). Refer to the tightening procedure and Figure 2 for the 1992-93 2.3L engines with the old bolt design. Refer to the tightening procedure and Figure 3 for the later 1993 2.3L engines with the new bolt design. Refer to Figure 1 for the bolt torque degree chart. NEW FASTENER TIGHTENING SPECIFICATION AND PROCEDURE: NOTICE: The following tightening procedure must be used to assure gasket life. Failure to follow this procedure exactly may result in cylinder head gasket leakage. -- PRE-CONDITION THE CYLINDER HEAD GASKET (Steps A and B) -- A. Install and tighten cylinder head bolts to the N-m (lbs.ft.) specification in SEQUENCE. Refer to Figure 2 for old bolt design and specification and Figure 3 for new bolt design and specification. B. After completing Step A on all ten bolts, in SEQUENCE tighten the cylinder head bolts the additional degrees indicated in Figures 2 or 3 (Figure 2 for old bolt design and Figure 3 for new bolt design) using J 36660. Refer to Figure 1 for bolt torque degree chart. C. In SEQUENCE, loosen each bolt one turn and immediately retighten it to the N-m (lbs.ft.) specification (refer to Figure 2 for old bolt design and specification, and Figure 3 for new bolt design and specification). D. After completing Step C on all ten bolts, in SEQUENCE tighten the cylinder head bolts the additional degrees indicated in Figures 2 and 3 (Figure 2 for old bolt design and Figure 3 for new bolt design) using J 36660. Refer to Figure 1 for bolt torque degree chart.