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923 A1 Cummins 250 knock looking to buy an '84 923 A1 with a non turbo 250 cummins. 3400 miles and 1000 hours on it. appears to be in great shape. my only concern because I'm not that familiar with the engine. It is very noisy at idle, like a knock. The owner says its a fuel knock. It doesn't...

new here in Arizona, thanks in advance, just bought an 87 m923. supposedly remanned in maine depot in 2011. two questions, how do i tell if the engine was either rebuilt or replaced? guy told me the engine should have a reman tag on it with info that i cant find, its a natural 250 cummins. no...