Connecting Rods, Pistons, Rings And Pins - Ford 1949-50-51 F-Series Truck Shop Manual

Section 3-Crankshaft, Bearings, and Piston Assemblies 15
inch wide by 1 inch long in the bearing cap with a new
standard insert and install the cap. Tighten the nuts.
Attempt to move the connecting rod endwise on the
crank pin by hand and then by a light tap of a hammer.
Remove the shim and repeat the above test. If con-
necting rod did not move by hand, but moved by tap
of hammer in the previous test and moved freely with
shim removed, the standard bearing as installed should
be used.
If
rod could be moved by hand when used
with the shim, install the 0.002 inch undersize bearing
and repeat the above test.
After determining that the correct bearing insert has
been fitted, tighten connecting rod bearing cap nuts.
Then rotate the shaft to be sure the bearing is not too
tight.
(5) CHECKING CRANKSHAFT END CLEAR-
fable 5-,Crankshaft End Play Specifications
Engine Crankshaft End Play (Inches)
H.M.orE 0.004-0.006
R 0.002-0.006
ANCE. Before you install new rear main bearing in-
serts the crankshaft end play should be checked. To
check the crankshaft end play, pry the crankshaft to-
ward the rear of the engine. Place a dial indicator
against the forward side of the rear counterweight. Set
the dial to zero and then pry the shaft forward (fig. 22).
If the dial indicator shows excessive end play (Table
5), the rear main bearing insert should be replaced
with a new insert to take up the end clearance.
4. CONNECTING RODS, PISTONS, RINGS, AND PINS
Procedures in this section cover all operations neces-
sary to fit an engine with new piston rings. Piston
cleaning and inspection, cylinder bore inspection and
CYLINDER
WAll
TAPER
reboring, fitting pistons, and fitting piston rings are dis-
cussed under the heading "a. Piston and Rings." In-
spection and fitting of piston pins is covered under
.CAST IRON
SECTION
CYLINDER
WAll
STEel
UI==iiiiI~SECTION
INNER RING
SNAP COMPRESSION RING
EXPANDER TYPE
COMPRESSION RING
STEEL SECTION
COMPRESSION RING
SNAP OIL RING
CYLINDER
WAll
INNER RING+-~~
CYLINDER
WAll
EXPANDER TYPE OIL RING
INNER RING
LJm=~Cl--STEEl
SlOTIED CAST
IRON Oil RING
SECTION
STEEL SECTION OIL RING
lEVELED INSIDE DIAMETER
SNAP COMPRESSION RING
COUNTERIORED INSIDE DIAMETER
SNAP COMPRESSION RING
1087
Fig. 23-Piston Ring Types