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350 AND 403 ENGINE
6A4-25
Fig.
6A4-65
Packing Oil Seal
Fig.
6A4-66
Cutting Off
Upper
Seal Ends
tEAR M A I N LOWER OIL SEAL
Removal
1. Remove oil pan.
2. Remove the rear main bearing cap.
3. Remove rear main bearing insert and old seal.
4. Clean bearing cap and seal grooves and inspect for
cracks.
Installation
1. Install seal into bearing cap, packing by hand.
2. Using seal installer, hammer seal into groove (Fig.
6A4-64).
NOTE: To check if seal is fully seated in the bearing cap,
slide the tool away from seal. With tool fully seated in
the bearing cap, slide tool against the seal. If undercut
area of tool slides over the seal, the seal is fully seated.
If tool butts against the seal, the seal must be driven
further into the seal groove. Rotate tool before cutting
off excess seal packing.
3. With tool slightly rotated, cut seal flush with mating
surface. With screwdriver, pack seal end fibers towards
center, away from edges. Rotate seat installer when cutting
seal to avoid damage to tool
4. Clean bearing insert and install in bearing cap.
5. Clean crankshaft bearing journal and seal contact.
Install sealer on cap as shown.
6. Install bearing caps, lubricate bolt threads with engine
oil and install. Torque No. 5 to 120 ft. lbs.
7. Install pan with new gaskets.
8. Install lower flywheel cover.
ROD ASSEMBLY
If a rod is twisted or bent, a new rod must be installed.
NO ATTEMPT SHOULD BE MADE TO STRAIGHTEN
CONNECTING RODS.
PISTON (FIG.6A4-67)
MEASURING PISTON
NOTE: Refer to PISTON INFORMATION Chart.
ABOUT
ABOUT
4057" DIA
4 351"
DIA
1
Fig.
6A4-67
Piston Identification
When replacing pistons, the original cylinder size is
stamped with a code letter on the block near each cylinder
on the cylinder head surface or on the oil pan rail (Fig. 6A4-
68).
When measuring piston for size or taper, measurement
must be made on skirt 90" from piston pin hole (with the
piston pin removed). (Fig. 6A4-69)
When measuring taper, the largest reading must be at
the bottom of the skirt. Allowable taper is
.00OW
to .0001".
The piston and cylinder bore must be free of oil and at
the same temperature.
NOTE: On some cars, oversize pistons may be found.
These pistons will be
.010"
oversize.
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