653 Detroit

[Mr Hagg]

is it a 6 53 or 4 53? Id pull the valve cover off and make sure there is not sticking injectors. Have someone turn the engine over and make sure all come up. Then look over the rack. I take vise grips and clamp down on the round part and open and close it see if it has any drag on it. these are real simple engines was the first ones I ever worked on when I was 13 years old...Our skidder had 4-53 in them