PISTON AND CONNECTING ROD - CONTINUED
REPAIR - CONTINUED
Perform steps 38 thru 41 for connecting rods tagged for crankpin bore resizing.
Connecting rod (1)
Make sure bearing cap (2) is torqued
See step 11.
Using ST-870 mandrel and block, push
out old piston pin bushing (3).
Using ST-561 connecting rod checking
fixture, recheck connecting rod length.
If connecting rod length is 11.991
inch (304.57 mm) or less, connect.
ing rod cannot be resized. Discard.
Using 1/2-inch drive 15/16-inch socket
and hinged handle, unscrew and take off
two nuts (4), two bolts (5), two washers
(6), and bearing cap (2).
The maximum amount of material that can be ground and lapped off connecting rod and
bearing cap mating surfaces, can be determined by subtracting 11.991 inch (304.57
mm) from the actual length of the connecting rod to be repaired, as measured using the
ST-561 connecting rod checking fixture.
During grinding and lapping operation, parts must be clamped securely to ensure
proper contact of entire mating surfaces and proper alinement of bolt bores when
assembled. Boltholes must remain perpendicular to machined mating surfaces.
Using surface plate and cutting fluid,
lap connecting rod, bearing cap (2),
and mating surfaces (7).
Using prussian blue, check seating of
mating surfaces (7).
Seating pattern must show a minimum
of 75 percent contact.
Seating pattern in area outside bolt
center line (area farthest from crank-
pin bore center line) must indicate
100 percent seating.