TM 5-3810-307-24-1-2
Crankshaft Bearing Replacement. (Refer to Figure I-7.)
NOTE
This procedure covers the replacement of the Single Cylinder Air
Compressor Crankshaft Bearing, Cummins kit part number 4089213.
The repair kit includes a ball and journal bearings, sump access plug,
seals, and head and cover gaskets.
Removal.
NOTE
There is no need to remove the air and coolant fittings from the head
assembly unless replacing the head.
a.
Remove the head assembly. Refer to paragraph I-3-1. Remove two head cover screws
and head cover gasket. Retain the head assembly but discard the four large head bolts,
two cover screws, head cover gasket, and head gasket.
b.
Remove the piston and connecting rod assemblies. Refer to paragraph I-3-3. Retain
the piston assembly, piston pin, piston pin retaining clips, connecting rod, Torx head
bolts, and connecting rod cap unless also replacing the piston and connecting rod
assemblies.
c.
Position the crankshaft (1, Figure I-7) in the Top Dead Center (TDC) position. The gear
alignment pin will also be in the TDC position. Press the crankshaft (1) with ball bearing
(2) out of the rear of the crankcase. This requires approximately 3,000 pounds (1,360
kg) of force.
d.
Using a cylindrical piece of steel that is a loose fit to the crankcase bore, press the
journal bearing (3) out of the crankcase toward the front. Discard the journal bearing.
e.
Clamp the crankshaft (1) by the counterweight and remove the ball bearing retaining nut
(4). Removal will require a high torque in the counter-clockwise direction.
f.
Remove and discard the ball bearing (2).
Cleaning.
WARNING
Many cleaning solvents are toxic, flammable, and/or may cause skin and
eye irritation. Strictly follow the manufacturer's instructions and use eye
protection, gloves, and protective clothing. Use in well-ventilated areas
away from heat and open flames. Use good personal hygiene prior to
eating, drinking, or smoking.
CAUTION
Do not use abrasive products that will leave grit after cleaning. Do not
allow debris and cleaning solvent to enter the cylinder bore.
a.
Remove any carbon and varnish build-up by carefully scraping. If necessary, use a light
application of cleaning solvent.
b.
Ensure all surfaces are clean, dry, and free of debris.
