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Cylinder head stress plate for Caterpillar 3126 diesel engines.

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Engine Builders: The AERA Technical Committee offers the following information regarding a revised cylinder head stress plate for Caterpillar 3126 diesel engines. Previously AERA published Technical Bulletin 1561 concerning a stress plate for this engine.

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The previously made plates covered a single cylinder and required multiple relocations of the plate to bore/hone all six cylinders. The revised stress plate covers all six cylinders and does not require removal until all honing operations have been completed. This stress plate should be used with a standard thickness head gasket with the cylinder head mounting bolts torqued to the values listed below.

Stress Plate Installation Procedures:

1) Verify the top of the cylinder block is clean, dry and free of nicks, burrs and is flat.

2) Torque all M20 bolts in numbered sequence to 99-121 ft.lbs.

3) Tighten large M20 bolts in numbered sequence to 305-335 ft.lbs.

4) Retighten large M20 bolts in numbered sequence to 305-335 ft.lbs.

As a reminder, it is also acceptable to install a repair sleeve for damaged or oversize bores on this engine. AERA is not aware of a company other than Caterpillar supplying this revised stress plate p/n 125-2064.

Engine Builders: The AERA Technical Committee offers the following information pertaining to GM

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