:: ENGINE PROBLEM ::

As with any surface grinding of the head face , block face or cam box face the amount machined can have an adverse effect on non- adjustable hydraulic tappets. The addition of suitable head or OHC shims can usually restore these specifications. Calculated Machining of lifter bases, rockers or valve tips is often required to rectify excess block face removal. The assembler has to establish that the lifters are within operating limits. Secondly the piston protrusion on some diesel engines may require rectification by piston crown machining. In these cases a dummy assemble and piston deck height check has to be carried out. Block dowel protrusion has to be checked to ensure clearance in the cylinder head is not impaired. Protruding dowels can prevent establishing correct clamping pressure on the head gasket. The ability to establish exact OHC timing, compression ratio and valves clipping pistons all have to be considered. With some engines these issues are not ever a problem but as engine design become more intricate these issues become more critical.