Figure 9. Checking Crankshaft End Play
remove and insert the pry bar on the other side of the bearing cap. Force the crankshaft in the opposite direc-
tion and note the amount of end play on the dial. The end play should be 0.004 to 0.011 inch with new parts or
a maxi- mum of 0.018 inch 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 (Cylinder Liner).
Install the cylinder head(s) (Cylinder Head).
10. Install the flywheel housing (Flywheel Housing), then install the flywheel (Flywheel).
Install the crankshaft lower engine front cover and oil pump assembly on in-line engines.
12. Install the engine front support, if used.
13. Install the crankshaft pulley (Crankshaft Pulley).
14. Install the oil pump inlet pipe and screen on in-line engines.
15. Check the crankshaft for distortion (bending) at the rear connecting rod journal counterweights
before and after installing a transmission. If improperly installed, these components can distort the crankshaft
and cause a crankshaft malfunction.
Overtightened drive belts can also cause crankshaft distortion. Refer to Lubrication
and Preventive Maintenance for recommended belt tension.
The part attached should not decrease crankshaft end play. While in each case one must be guided by the
individual circumstances and facts that evolve, generally speaking Detroit Diesel Allison cannot be re-
sponsible for system damage caused by engine-to-driven component interference and/or distortion.
Consequently, the engine crankshaft end play check and crankshaft distortion check are MUSTS.
Check the crankshaft distortion as follows:
Rotate the crankshaft clockwise until the crankshaft counterweights at the rear connecting rod
journal are in the 6 o'clock position.
Center punch a hole in the in- side face of each counterweight cheek, one quarter of an inch from
the lower end of each counterweight, to support the gage.