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The main tunnels or cam tunnels in a block have to remain straight otherwise the shaft may seize or bearings may fail. The crankshaft main caps can be closed (mating faces ground to reduce the size of the tunnel) and a line boring machine is used to re-machine the tunnel back to the original size and correct alignment. Cam tunnels in blocks don't have removable caps so the cam tunnels are machined oversize and o/s backed cam bearings fitted. This repair is limited by the availability of o/s backed cam bearings.
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