Flywheel Repair; Connecting Rods; Ring Gear Replacement - Ford 1949-50-51 F-Series Truck Shop Manual

Section 4-Connecting Rods, Pistons, Rings, ond Pins
19
Check each piston pin bore which has been reamed
with the pin to be used in that particular bore.
Use a new piston pin to check the piston pin bush-
inE; in the connecting rod for wear. If the new pin fa lls
through the bore by its own weight, ream the bore for
the next oversize pin (fig. 29), or replace the bushing.
c. Connecting Rods.
Connecting rods with damaged threads, nicked studs,
deep nicks, signs of fractures, scored bore, or with the
bore out of round more than 0.0002 inch should be
replaced.
Connecting rods with twists or bends sho uld be
replaced. Check every connecting rod for alignment on
a fixture after fitting the piston pins (fig. 30) .
~_+-
__
PISTON PIN - - =
Connecting Rod
Aligner
F;~ .
30-Checking Connecting Rod Alignment
5. FLYWHEEL REPAIR
Flywheel repair consists of refacing the clutch fri c-
tion surface or replacing the starter ring gear.
a. Inspection.
Flywheels that have a burned or scored friction face
surface should be replaced or machined. Check the
flywheel runout by positioning a dial indicator on the
outer edge of the surface contacted by the clutch plate
(fig. 31) .
If the runout exceeds 0.005 inch total
indi~ator
read-
ing, remove the flywheel and turn it 180
0
,
then replace
it and again check the runout. If the runout is still in
excess of 0.005 inch, machine or replace the flywheel.
Fig.
29-Reaming Connecting Rod Bushing
h. Refacing.
If it is necessary to remove more than 0.045 inch
from the original thickness of the flywheel to obtain
a smooth surface, it should be replaced.
c. Ring Gear Replacement.
To replace a ring gear, drill a
1 %2
inch hole nearly
through the ring gear on the engine side of the gear,
a nd cut the re maining portion with a chisel. Heat the
new ring evenly to 360 °F., and place it in position on
the flywhee l and allow it to cool. Check the ring gear
runout. The runout must not exceed 0.010 inch.
Fig. 3J-Checking Flywheel Runoul