Crankshaft Rear Oil Seal Retainer (5.0L And 5.7L Engines); Assembly Of The Engine; Crankshaft And Main Bearing Installation - GMC T Series 1994 Repair Manual

Figure 65— Checking Crankshaft Run-Out
Measure (Figures 64 and 65)
• Main bearing and connecting rod journal diameters
(figure 64). Compare with " Specifications." Grind or
replace the crankshaft if necessary.
• Main bearing and connecting rod journals for taper
and out-of-round (figure 64). If the journals are
tapered or out-of-round more than 0.0254 mm
0.001
( inch), grind or replace the crankshaft.
• Crankshaft run-out (figure 65).
A. Mount the crankshaft in V-blocks on main jour­
nals 1 and 5.
B. Use a dial indicator to measure the crankshaft
runout, as shown in figure 65.
C. If the main journals are misaligned, the crank­
shaft is bent and must be replaced, along with
the main bearings.
Crankshaft Bearing Availability
Crankshaft main and connecting rod bearings are
available in 0.0254 mm (0.001 inch), 0.0508 mm (0.002
inch), 0.2540 mm (0.010 inch), and 0.5080 mm
0 020
( . -inch) undersizes.
PRIOR TO ASSEMBLY
The importance of cleanliness during the assembly
procedure cannot be overstressed. Dirt will cause pre­
mature wear of the rebuilt engine.
Lubricate all moving parts lightly with engine oil or
engine assembly lubricant (unless specified otherwise)
during assembly. This will provide initial lubrication
when the engine is started.

ASSEMBLY OF THE ENGINE

Figure 66— Seal Removal Notches (5.0 and 5.7L
Engines)
CRANKSHAFT REAR
OIL SEAL RETAINER
(5.0L AND 5.7L ENGINES)
Disassemble (Figure 66)
❖
• Crankshaft rear oil seal. Insert a screwdriver into
the notches provided in the seal retainer and pry
66
the seal out (figure
Clean
All traces of old gasket from the retainer.
Inspect
I?
Retainer for cracks, porosity, and damage to the
sealing surfaces.
Important
• Install the new crankshaft rear oil seal with the
proper tool after the retainer is assembled to the
engine, as outlined later.
CRANKSHAFT AND M AIN
BEARING INSTALLATION
Main bearings are the precision insert type and do
not use shims for adjustment. If clearances are exces­
sive, a new bearing will be required. Service bearings
are available in standard size and 0.0254 mm (0.001
inch), 0.0508 mm (0.002 inch), 0.2540 mm (0.010 inch),
0.020
and 0.5080 mm (
(0.009 inch) is available for 5.0L and 5.7L engines only.
).
inch) undersize. 0.2286 mm