Camshaft; Camshaft Bearings; Tim In G Chain And Sprockets; Crankshaft Sprocket Replacement - GMC T Series 1994 Repair Manual

CAMSHAFT

Important
• Whenever the camshaft needs to be replaced, a
new set of lifters must also be installed.
L 1 Inspect
Camshaft lobes and journals for scratches, pitting,
scoring, and wear.
| j | Measure (Figure 25)
• Camshaft journal diameters (figure 25). Refer to
" Specifications" for proper diameters.

CAMSHAFT BEARINGS

Refer to SECTION 6A for replacement procedures.
TIM IN G CHAIN AND
SPROCKETS
Inspect
I?
• Sprockets for chipped teeth and wear.
— Excessively worn sprockets will rapidly wear a
new chain.
• Timing chain for damage.
— An excessively worn chain will rapidly wear a
new set of sprockets.

CRANKSHAFT SPROCKET REPLACEMENT

Remove or Disconnect (Figure 26)
Tool Required:
J 5825-A Crankshaft Gear Remover
1. Crankshaft sprocket using J 5825-A.
2. Key (if damaged).
+«■ Install or Connect (Figure 26)
Tool Required:
J 5590 Crankshaft Gear Installer
1. Key (if removed).
2. Crankshaft sprocket using J 5590.
FRONT COVER
Clean
Old gasket from the gasket surfaces.
L
Inspect
1
• Front cover for damage, dents, or cracks.
Remove or Disconnect
Oil seal from the front cover.
• Pry the seal out with a large screw driver.
• Be careful not to distort the front cover.