G643 (E) Service Manual Chapter 3. Engine Mechanical System 81
Camshaft Bearings
Camshaft Bearing Removal
Figure 12-43
Tool Required:
• J 33049 Camshaft Bearing Remover and
Installer
Remove or Disconnect
1. Rear camshaft plug.
2. All camshaft bearings. Use J 33049 (figure 12-
43).
A. Insert the tool with the correct collet into the
camshaft bearing you want to replace.
B. Turn the tool until the collet has tightened in
the bearing.
Figure 12-43 Removing / Installing Camshaft Bearings
C. Push the center cone against the block and
into the bearing bore to center the tool.
D. Drive the bearing from the block.
E. Repeat this procedure to remove the
remaining inner camshaft bearings. Note that
the rear bearing must be removed from the
front of the block and the front bearing from
the rear. This allows the tool to remain
centered.
Cleaning and Inspection
Clean
• Camshaft bearing bores in the block.
Inspect
• Camshaft bearings for scratches, pits, or loose fit
in their bores. Replace the camshaft bearings if
necessary.
• Camshaft lobes and journals for scratches, pitting,
scoring, and wear. Minor irregularities may be
cleaned up with emery cloth.
Camshaft Bearing Installation
Figure 12-43
Install or Connect
Tool Required:
• J 33049 Camshaft Bearing Remover and
Installer
NOTICE: The outer camshaft bearings must be
installed first. These bearings serve as guides for
the pilot, and help center the inner bearings during
the installation process.
NOTICE: Make sure to fit the correct cam bearing
into the bore. The cam bearing bores vary in size.
1. Rear camshaft bearings. Drive the bearings into
place using J 33049 from front of engine (figure
12-43).
IMPORTANT: Make sure the camshaft bearing
hole (or holes) align with the oil hole (or holes)
in the block. On some engines, the oil holes may
be difficult to see. If so, use a piece of 2 mm rod
to check alignment.
2. Front camshaft bearing using tool J 33049
(figure 12-43).
IMPORTANT: Make sure the camshaft bearing
hole (or holes) align with the oil hole (or holes)
in the block.
3. Inner camshaft bearings using tool J 33049.
Reverse of removal procedure.
4. Camshaft rear plug.
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