NOTE
available in three sizes and colors. T y p e
PG-1 (green) has a clearance range of
0.001" to 0.003", type PR-1 (red) has a
When installing or adjusting an ac-
cessory drive belt(s), be sure the
range of 0.002" to 0.006" and type PB-1
(blue) has a range of 0.004" to 0.009".
bolt at the accessory adjusting pi-
vot point is properly tightened, as
The plastic strip may be used for check-
well as the bolt in the adjusting
slot.
ing the bearing clearances as follows:
1. Remove the bearing cap and wipe the
oil from the bearing shell and the crank-
shaft journal.
SHOP NOTE - TROUBLESHOOTING
NOTE
S h o p Notes
When checking the main bearing
TEFLON WRAPPED PIPE PLUG.
Pipe
clearances with the engine in a po-
plugs with a baked teflon coating are
sition where the main bearing caps
available for service.
are supporting the weight of the
However, pipe
plugs can be hand wrapped satisfactorily
crankshaft and the flywheel, an
with teflon tape to provide a better seal
erroneous
r e a d i n g , due
to
the
and facilitate plug removal. When a teflon
weight of the crankshaft and fly-
wrapped plug is installed, it is extremely
wheel, can be eliminated by sup-
important that the specified torque not
porting
the
the
weight of
be exceeded.
crankshaft with a jack under the
counterweight adjoining the bear-
Hand wrap a pipe plug with teflon tape
ing being checked.
as follows:
1. Be sure the pipe plug is thoroughly
2. Place a piece of the plastic strip the
clean and dry prior to applying the te-
full width of the bearing shell, about
flon tape. All dirt, grease, oil and scale
1/4" off center (see Figure 11B-183 on
must be removed.
2. Start the tape one or two threads from
3. Rotate the crankshaft about 30 from
the small or leading edge of the plug,
bottom dead center and reinstall the
joining the tape to ether with an overlap
bearing cap.
Tighten the bolts to the
of approximately 1/8".
specified torque.
3. Wrap the tape tightly in the same di-
4. Remove the bearing cap. The flat-
rection as you would turn a nut.
The
tened plastic strip will be found adhering
tape must conform to the configuration of
to either the bearing shell or the crank-
the threads (be pressed into the minor
shaft.
diameter of the threads) without cutting
5. Compare the width of the flattened
or ripping the tape.
plastic strip at its widest point with the
graduations on the envelope. The num-
4. Hand tighten and hand torque the
pipe plug and do not exceed the speci-
ber within the graduation on the envel-
fied
torque. D o not use power tools.
ope indicates the bearing clearance in
thousandths of an inch.
Taper may be
CHECKING BEARING CLEARANCES. A
indicated when one end of the flattened
s t r i p i s w i d e r t h a n t h e o t h e r . Measure
strip of soft plastic squeezed between
each end of the plastic; the difference
the crankshaft journal and the connect-
between the readings is the approximate
ing rod bearing or main bearing may be
amount of taper.
used to measure the bearing clearances.
The strip is a specially molded plastic
"wire" manufactured commercially and is
Engine (Less Major Assemblies)
