DETROIT DIESEL 53
Fig. 10 - Standard Dimensions at Crankshaft
Fig. 11 - Checking Crankshaft End Play
Thrust Surfaces--in-Line Engines
them in the same locations from which they were removed.
NOTE: When a new or reground crankshaft is installed, ALL new main and
connecting rod (upper and lower) bearing shells and new thrust washers must
also be installed.
Apply clean engine oil to all crankshaft journals and install the crankshaft in place so that the timing marks
on the crankshaft timing gear and the idler gear match. Refer to Section 1.7.1 for the correct method of timing the gear
4. Install the upper halves of the crankshaft thrust washers on each side of the rear main bearing support and the
doweled lower halves on each side of the rear main bearing cap. The grooved side of the thrust washers must face
toward the crankshaft thrust surfaces.
NOTE: If the crankshaft thrust surfaces were reground, it may be necessary to
install oversize thrust washers on one or both sides of the rear main journal.
5. Install the lower bearing shells (no oil grooves) in the bearing caps. If the old bearing shells are to be used again,
install them in the same bearing caps from which they were removed.
Install the main bearing caps and lower bearing shells as outlined under Install Main Bearing Shells in Section 1.3.4.
NOTE: If the bearings have been installed properly, the crankshaft will turn
freely with all of the main bearing cap bolts drawn to the specified torque.
7. Check the crankshaft end play by moving the crankshaft toward the gage (Fig. 11) with a pry bar. Keep a constant
pressure on the pry bar and set the dial indicator to zero. Then remove and insert the pry bar on the other side of the
bearing cap. Force the crankshaft in the opposite direction and note the amount of end play on the dial. The end play
should be .004" to .011 " with new parts or a maximum of .018"with used parts. Insufficient end play can be the result of a
misaligned rear main bearing or a burr or dirt on the inner face of one or more of the thrust washers.
Install the cylinder liner, piston and connecting rod assemblies (Section 1.6.3).
11. Install the crankshaft lower engine front cover and the lubricating oil pump assembly on In-line