Mazda Engine >> REVISED CYLINDER HEAD BOLT

Mazda Engine >> REVISED CYLINDER HEAD BOLT

Revised Cylinder Bolt For
1995 Mazda 2.5L, KL Engines

The AERA Technical Committee offers the following information on a revised cylinder head bolt for 1995 Mazda 2.5L KL engines. The cylinder head bolt length was reduced and the accompanying washer eliminated beginning with vehicle VIN Code 1YVGEDS5361783 and engine serial number KL556012.

Using the short bolt with an additional washer may result in an improper clamping load. The original design bolt (longer) may be used on engines produced after the serial number break ONLY if the washer is installed. The current head bolt (shorter) may be used on the engines produced before the serial number break ONLY if the washer is eliminated.

The torque values used to install the cylinder head bolts remains as previously published. Mazda allows reuse of bolts in good condition if their lengths do not exceed 5.315 (135mm) for the shorter bolts or 5.127 (132.5 mm) for longer bolts. Follow the steps listed below to tighten the cylinder head bolts for this engine.

Step 1. Torque all bolts in sequence to 17-19 ft/lbs.
Step 2. Paint on all bolts and head casting to help indicate their position.
Step 3. Rotate all bolts in sequence an additional 85-95° (Figure 2 & 3).
Step 4. Rotate all bolts in sequence an additional 85-95° (Figure 2 & 3).

The AREA Technical Committee

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