TM 9-4310-397-14
6-11. CRANKSHAFT, PULLEY, IDLER GEARS, AND MAIN BEARINGS INSPECTION, REPAIR AND
REPLACEMENT. - Continued
(b)
Use a soft wire (Figure 6-107, 1) and compressed air to clean orifice. Replace, if condition is
questionable.
CAUTION
A piston cooling orifice failure could cause damage to pistons, piston pins, rod
pin bushings, and liners. If a piston cooling orifice is left out, low or no oil
pressure will result.
(c)
Install all the orifices and torque to 84 lb-in (10 Nm).
(3)
Install main bearings and crankshaft.
(a)
Install main bearing inserts. Make sure that tang (Figure 6-108, 1) on the inserts is engaged with slot (2)
in the cylinder block and main bearing caps. Also make sure that oil holes line up with oil passages in
block.
Figure 6-108. Install Main Bearings
NOTE
If new thrust bearing inserts or thrust bearing washers are installed, they must be
installed as a set.
(b)
Install main thrust bearing (3)
in rear web of cylinder block.
(c)
Apply a liberal coating of clean engine oil (item 10, section II, appendix E) to bearing surfaces and
crankshaft journals.
(d)
Using proper lifting equipment, lower crankshaft onto main bearings.
(e)
Dip entire main bearing cap screws in clean engine oil and position them in the main bearing caps. Apply
a liberal amount of oil to bearing inserts in caps.
(f)
Install each bearing cap, bearings (4) and cap screws with washer with the recesses and tabs aligned in
matching order. Make sure bearing tabs also match up before tightening cap screws.
6-88
