Cylinder Bores - GMC T Series 1994 Repair Manual

The area where the main bearing inserts con­
tact the main bearing bore should be smooth.
If a main bearing cap is damaged and requires
replacement, replace it as outlined later.
^ Measure (Figure 43)
Head gasket surface distortion. Use a straight edge
and feeler gage to check for flatness of the milled
surface at the top of the cylinder block. The surface
175
144. BLOCK, ENGINE
175. PLUG, ENGINE BLOCK COOLANT DRAIN HOLE
Figure 41— Engine Block Coolant Drain Hole Plug
(5.0L and 5.7L Engines)
MAIN BEARING CAP REPLACEMENT
144

CYLINDER BORES

V2879 L*
must be flat (within 0.10 mm {0.004 inch}) to
ensure proper head gasket sealing.
Install or Connect
1. New main bearing cap. The arrow on the main
bearing cap faces the front of the engine (opposite
the flywheel).
N O T IC E : R e f e r to " N o t i c e " o n p a g e 6 A 5 -1 .
2. Main bearing cap bolts.
Q
Tighten
• Bolts to " Specifications."
Measure
• Main bearing vertical ID (inside diameter). Use
an inside micrometer.
• This dimension should be the same as the oth­
er main bearing bore vertical diameters.
Inspect