Process for renewing cylinder heads
Patent 4967458 Issued on November 6, 1990. Estimated Expiration Date: 
December 31, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 31, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2632944 3192618 3392435 3675309 Method for manufacturing a forged piston with reinforced ring groove Patent #: 4364159 InventorsAssigneeApplicationNo. 141623 filed on 12/31/1987US Classes:29/888.011, Repairing, converting, servicing or salvaging29/402.07, And by a metallurgical operation, e.g., welding, diffusion bonding, casting29/526.4, Removing defects228/119Repairing, restoring, or renewing product for reuseExaminersPrimary: Arnold, Bruce Y.Assistant: Kachmarik, Ronald M. Attorney, Agent or FirmInternational ClassesB23P 015/00B23P 006/00 B23K 031/00 AbstractA process for renewing a cylinder head, preferably a cast aluminum water cooled cylinder head from a used condition to a rebuilt condition suitable for reuse. In a qualifying stage the used cylinder head is stripped of removable parts, inspected, heat treated for cleaning and stress relieving purposes, and then pressure tested to detect leaks through cracks or excessive porosity. If cracks are located, the cylinder head passes through a reconstruction stage wherein cracked areas are removed and replaced by welded material, recontoured and preferably again pressure tested. A cylinder head which did not need reconstruction (or after reconstruction) then passes to the rebuilding stage where it is essentially machined and component parts replaced. Included in the rebuilding stage is a line-boring and surface gasket facing procedure for eliminating the adverse effects of warpage and a vacuum impregnation step to seal the pores of the cylinder head.Other References
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