Hudson 63 1936, Руководство по механическим процедурам

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SECTION 7
Page 8
HUDSON-TERRAPLANE
is held in a horizontal position.
Connecting Rod Alignment
Whenever a connecting rod is removed from the engine it
should be checked for alignment. This requires only a few
minutes per rod and insures against the possibility of having to
tear the job down again.
The HM65 Connecting Rod and Piston Aligner shown in Fig.
711 and Fig. 712 shows a close-up of the head of this Aligner
with the three indicators for checking twist or bend of the rod
and piston skirt squareness.
To align a rod proceed as follows:
1. Select bushing to fit connecting rod lower bearing and
fasten it securely in the rod bearing with the rod cap and bolts.
2. Insert the piston pin in the rod. The pin must fit with only
.0003" clearance if an accurate alignment is to be made.
3. Place the rod in the base of the fixture directly under the
sliding head and insert the arbor through the bushing and base
supports.
4. Move the head down until the indicator blocks rest lightly
on the piston, then move head down 1/32" to 1/16" further and
tighten thumbscrew on left of head.
5. Press the top of the rod back against the eating block and
the condition of the rod is immediately shown, the vertical dial
showing the bend and the horizontal dial the twist. Perfect
alignment is obtained when both dial hands register with the
scribed lines.
6. If the indicators do not register with the scribed lines, pull
the top of the rod away from the fixture and bend or twist with
the HM-3R bending bar as shown in Figure 711. Always
bend beyond the straight position and bend back to straight to
relieve strains set up by bending or the rod will not remain
straight after it is installed in the engine.
After the rod is straightened for twist and bend it is still
possible that the upper end does not have the correct offset.
Check the offset as follows:
1. Place rod in right side of base and insert arbor through
bushing and supports.
2. Move sliding gauge on right rail up in line with wrist pin
bushing and move rod to left until wrist pin bushing contacts
sliding gauge. Tighten thumbscrew.
3. Move gauge on base until it contacts left end of connect-
ing rod bearing and tighten thumbscrew.
4. Remove rod and reinsert it in the reversed position.
If the upper bushing strikes the upper gauge, the lower gauge
should be (N") inches from the lower bearing. If the lower
bearing touches the lower gauge the end of the wrist pin
bushing should be (N") inches from the upper gauge.
5. If the rod does not have the correct offset, move the
sliding gauge along the rod to determine where it is off.
6. Place a bending bar on the rod just below this point and
use another bending bar to bend rod into proper position.
7. Recheck alignment.
Connecting Rod and Piston Removal
The connecting rod and piston assemblies are removable by
removing the oil reservoir and cylinder head. The connecting
rod caps are then removed and
Figure 711—HM-65 Connecting Rod and Piston Aligner
Figure 711—HM-65 Connecting Rod and Piston Aligner