GMC Powertrain 4.3 L, Service Manual, Page: 100 / 196

6-90 Marine/Industrial 4.3L Engine
2000 Marine/Industrial
4985
63219
Important: A loose camshaft bearing may be caused by an
enlarged, out-of-round or damaged engine block camshaft bearing
bore.
Important: Always remove the camshaft inner bearings #2 and #3
first. The camshaft outer bearings #1 and #4 serve as a guide for
the J 33049.
Caution: Refer to Safety Glasses Caution in Cautions and
Notices.
3. Remove the camshaft inner bearings #2 and #3.
3.1. Insert the J 33049 through the front of the engine block
and into the camshaft inner bearing #2.
3.2. Tighten the J 33049 expander assembly nut until snug.
3.3. Push the J 33049 guide cone into the camshaft front
bearing in order to align the J 33049.
3.4. Drive the camshaft inner bearing #2 from the camshaft
inner bearing bore #2.
3.5. Loosen the J 33049 expander assembly nut.
3.6. Remove the camshaft inner bearing #2 from the
J 33049 expander assembly.
3.7. Insert the J 33049 expander assembly into the
camshaft inner bearing #3.
3.8. Tighten the J 33049 expander assembly nut until snug.
3.9. Push the J 33049 guide cone into the camshaft front
bearing in order to align the J 33049.
3.10. Drive the camshaft inner bearing #3 from the
camshaft inner bearing bore #3.
3.11. Loosen the J 33049 expander assembly nut.
3.12. Remove the camshaft inner bearing #3 from the
J 33049 expander asssembly.
4. Remove the J 33049 from the engine block.
5. Remove the camshaft outer bearings #1 and #4.
5.1. Insert the J 33049 into the camshaft outer bearing #1.
5.2. Tighten the J 33049 expander assembly nut until snug.
5.3. Drive the camshaft outer bearing #1 from the camshaft
outer bearing bore #1.
5.4. Loosen the J 33049 expander assembly nut.
5.5. Remove the camshaft outer bearing #1 from the
J 33049 expander assembly.
5.6. Remove the J 33049 from the engine block.
5.7. Insert the J 33049 expander assembly into the
camshaft outer bearing #4.
5.8. Tighten the J 33049 expander assembly nut until snug.
5.9. Drive the camshaft outer bearing #4 from the
camshaft outer bearing bore #4.
5.10. Loosen the J 33049 expander assembly nut.
5.11. Remove the camshaft outer bearing #4 from the
J 33049 expander asssembly.
6. Remove the J 33049 from the engine block.
7. Discard the camshaft bearings.