Method for boring overhead cam engine cylinder heads
OwnerBrice Harmandinventor
Life of this patent
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Abstract
A method and machine for repairing overhead cam engine cylinder heads. The method includes the steps of removing the caps from the bases of the bearing towers or housings, removing material from the legs of the caps to reduce their height, replacing the caps on the bases, and boring the resulting bearings to produce bearings of the proper diameter. The machine includes a device for machining a bearing cap and a device for boring the bearings. The device for boring the bearings has a boring bar that is supported only at opposite ends of the cylinder head. The bar does not sag or chatter because it is made of an extremely hard and dense material such as a dense tungsten alloy or a ceramic-coated metal.
Claims7
A method for repairing an overhead cam cylinder head, said cylinder head having two ends and a plurality of bearing towers for retaining a camshaft along an axis, each said tower comprising a base portion and a cap, said cap having an upper bearing surface and two flange surfaces lying in a flange plane on either side of said upper bearing surface, each said flange surface having a bore, and said base portion having a lower bearing surface, the method comprising the steps of:
- removing each cap from said cylinder head;
- removing material from said flange surfaces of each cap;
- disposing a boring bar having a plurality of cutting bits on said lower bearing surface of each said tower;
- replacing each cap on said cylinder head;
- and
- boring each said tower along said axis to produce a cylindrical bearing surface.
Dependencies are inferred from the claim text.