Info - Guidelines for Cylinder Bore Liner/Piston Sleeve Replacement on the L4 Ecotec Engine

This bulletin is being revised to update the model years. Please discard Corporate Bulletin Number 03-06-01-022 (Section 06 - Engine).

Replacement of the cylinder bore liner is now a validated service repair process and an alternative to engine block or engine assembly replacement. Conditions for engine cylinder bore liner replacement are somewhat difficult to determine and may initially appear as other common customer concerns. Customer may comment on conditions such as:

All of the above conditions MAY be symptoms of a cylinder bore liner that needs replacement. Cylinder liner replacement determination should be made AFTER the cylinder head has been removed for inspection. Inspect the engine for the following conditions:

This "dropped" condition can be determined using a straight edge across the bore liner flange and block deck face. When there is clearance between the straight edge and the cylinder bore liner flange, the cylinder liner has dropped below the block deck face.

When the measured cylinder bore diameter exceeds the Service Manual specification, bore liner replacement is the service procedure.

In any of these cases, the cylinder bore liner may be replaced instead of replacing the engine block or engine assembly. The procedure for replacing the cylinder bore liner is covered in the Service Information as well as Corporate Bulletin Number 03-06-01-018.

Notice: The Cylinder Bore Liner, P/N 88984129, inside diameter (I.D.) is fully machined and honed to size and is optimally finished as shipped from GMSPO. Any attempt to modify this factory produced sizing and finish with any additional boring or honing may lead to engine damage, excessive noise or abnormal oil consumption.

Parts are currently available from GMSPO.