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In Reply to: engine stuck D4 posted by Rich Molacek on Saturday, October 10, 2015:
--I have a 3204 caterpillar 953 with the same problem.
--I would put a socket on the crank shaft with a long breaker bar. but you can only put as much force on it as the bolt head will take before it loosens up or breaks.
--I want to put a wrench on the crank pulley, or take the crank pulley off and put a modified pulley on it that will allow more force to rotate the crank.
--you need to remove the injectors before you try to rotate it too. so that the piston can go all the way to the top of the cylinder.
--cover the engine and the top of the tractor too.
Using a breaker bar to turn a frozen engine over by the crankshaft bolt is not recommended. The acceptable method involves turning the engine from the flexplate/flywheel, or by using a crankshaft socket that fits over the snout of the crank or bolts to the damper. Exceeding the torque rating of the crank bolt can - and will - snap it off, costing a lot of time and trouble to fix.
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