Mack ASET AC, Руководство по обслуживанию

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Page 288
REPAIR INSTRUCTIONS, PART 1
SPECIAL TOOL REQUIRED
앫
Magnetic Base Indicator Tool J 7872
INSTALLATION PROCEDURE
1. Clean the bore in the bearing cap and back
of the lower bearing insert.
2. Install the bearing insert in the bearing cap
bore (Figure 323). The insert must be
installed dry.
The lower bearing inserts do not have a hole or a
groove. They are stamped with the word
“LOWER.”
Do not mix the caps or inserts. The caps are
numbered from 1 through 7, front to rear.
323
Figure 323 — Main Bearing Installation (Lower)
3. Lubricate the threads of the bearing
capscrews with clean engine oil and place
the capscrews in the cap holes.
4. Position the No. 1 bearing cap over the
No. 1 crankshaft journal and start the screws
in the threaded holes in the cylinder block.
5. Using a plastic-faced mallet, tap the bearing
cap down until it contacts the machined
mounting surface.
6. Tighten the screws until they contact the
bearing cap. At this time, tighten them only
finger-tight.
7. Repeat the above steps for the bearing cap
Nos. 2, 3, 5, 6 and 7. The center bearing
cap, No. 4, is installed later.
8. Tighten the bearing cap capscrews to
specification, 210 lb-ft (285 N
폷
m), using
torque wrench J 24407, or equivalent.
9. Place the upper thrust washer sections in
position in the cylinder block at the center
bearing, No. 4, location as shown in
Figure 325. The steel side of the thrust
washer goes toward the block, the
aluminum-faced or bronze-faced side (side
with oil reservoir grooves and tip-face
reliefs) goes toward the crankshaft. This
applies to both upper and lower thrust
washer sections.
Use standard thickness thrust washers initially.
324
Figure 324 — Thrust Washer Styles
1. Locating Tab
2. Bearing Insert 3. Bearing Cap
5-111.bk Page 288 Monday, July 10, 2006 2:26 PM