Join Date: Jan 2008
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i had a 74 freightliner with the 425 in it.nuthing ever went wrong with it in 700,000 miles except the little check valves in each end of the injecter lines. they went bad and the power went south. a mech at miami cat was listening to it and said" i know whats wrong" he grabbed each injector line and said they were pulsating. sure enough, they were . a new set of check valves and all was ok. it ratted like hell at about 900 rpm with no load on it. sounded like it would blow up. 335 cummins did that too.,,sounded cool. it was the injection,,,no leaks either. that engine was bone dry. i sold it to a guy in bud lake nj who rans scrap paper to ohio and bricks back, he ran it for 1,300,000 miles before a tear down. the rings were perfect,,they did a recon head and turbo kit and buttoned it up for another few 100,000 mies and he retired. a great engine,,,butt i had to have a 600 kta in 1980.