New Flywheel for Cummins 12v 6BT 5.9 and 8v 4BT 3.9. This measures 17.5 inches.
This flywheel is solid steel and is very heavy. Some issues with flywheel are warpage and the teeth wearing out. The starter's teeth slowly wear the flywheel's teeth.
The flywheel and bellhousing need to be a matching set. If they are not, then either the flywheel won't fit, or the starter won't line up.
Make sure that your flywheel is the same size as this one, or I also sell a bell housing to match. I don't know how many different sizes there were.
Scroll down for more detailed compatibility information.
Part Number: 3999603 4990111 20180112
Weight: 25 lbs.
Price: $159.00
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3999603 Flywheel
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