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03 I'national 4300 DT466 Repeated Fuel Injector O-Ring Fail
Posted to HD/Fleet Forum on 10/30/2018 25 Replies

Hey guys, we have one of our tow trucks that we rebuilt the engine and cylinder head. Replaced the injectors while we had the engine apart. Went through the engine with a fine tooth comb. Block ended up having cracks so we replaced the block with a NEW block. ... Login to read more.

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