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I have a 4BT on the bench that I am tearing down for rebuild. I was surprised to see the cross hatch hone pattern still on the cylinder walls, and no ridge at the top of the cylinder.

Anyone with experience rebuilding these engines have a idea roughly how many 1000's of miles are required before the cross hatch hone pattern is worn smooth and there is a cylinder ridge ?

Just trying to develope a feel for these engines, wear vs miles

Paul
 

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Two problems with determining accumulated miles by condition of bore: was it plain iron, chrome or plasma-moly rings? Each material wears differently and has a different effect on the bore. A second factor is the grit of stones used to hone. Obviously a coarse grit will leave score marks for a longer time than fine grit.

I would expect to start seeing a ridge by at least 100,000 miles, maybe a bit sooner, depending on what rings were used.

O/T: is that Moose Creek Maple Syrup ready yet...? I'm running low!
 

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You're so right, Paul. The first can cause an unexpected rebuild but the second can cause an unexpected trip to the local Emergency Room Trauma Unit!
 
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