Check the end play of the crankshaft with Tool (A). The
end play of the crankshaft must be 0.07 to 0.32 mm
(.003 to .013 inch).
install pistons and connecting rods
install front housing and camshaft idler gear assembly
install crankshaft rear seal carrier
install cylinder head assembly
Measuring Main Bearing
Using Plastigage To Measure Main
Caterpillar does not recommend checking actual engine
bearing clearances, particularly on small engines, because
of the possibility of obtaining inaccurate results, and the
possibility of damaging the bearing or journal surfaces.
Each Caterpillar engine is quality checked for specific wall
If the crankshaft journals and bores for the
measured at disassembly and found to be within
specification, no further checks are necessary
when using the correct bearing. However, if the
serviceman still wants to measure the bearing
clearances, Plastigage is an acceptable method.
Plastigage is less accurate on small diameter
journals where clearances are less than 0.10 mm
Use of lead wire, shim stock or a dial bore gauge can
damage the bearing surfaces.