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Mack ASET AC - Cylinder Block Dowel Pin Replacement

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REPAIR INSTRUCTIONS, PART 1
Page 211
Cylinder Block Dowel Pin
Replacement
[211 HA]
GENERAL INFORMATION
Precision-made round-type and blade-type
locating dowel pins are used for alignment of the
front cover and flywheel housing.
SPECIAL TOOL REQUIRED
앫 Flywheel Housing/Timing (Front) Cover
Locating Pin Driver J 37712
REMOVAL
If it is necessary to remove the front cover or
flywheel housing locating dowel pins, do so as
follows:
1. Securely clamp the pin with a pair of locking
pliers.
2. While exerting an outward force, rotate the
pin back and forth until the pin works free
from the hole.
INSTALLATION
Two dowel pins are used to locate both the
flywheel housing and the front cover to the
cylinder block. One dowel is round, the other is a
blade type. One end of the blade-type pin is also
round and is the end installed in the cylinder
block.
The dowels used for the front cover installation
are similar except for size. The smaller dowels
are used for the front cover and the larger dowels
for the flywheel housing.
ROUND DOWEL PIN INSTALLATION
1. Insert the round dowel pin into the locating
pin driver J 37712. The pin must be
positioned in the driver with the tapered end
of the dowel facing outward.
2. Position the exposed end of the dowel into
the appropriate dowel pin hole in the cylinder
block (see Figure 217 or Figure 218 for
location).
3. Using a hammer, drive the pin into the block
until the driver contacts the cylinder block.
When the driver has made contact with the
block, the dowel pin will be at the correct
dimension above the block surface.
216
Figure 216 — Round Dowel Pin Installation
1. Locating Pin Driver
2. Round Dowel Pin
3. Cylinder Block
4. Dowel Pin Hole
5-111.bk Page 211 Monday, July 10, 2006 2:26 PM

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