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20. CRANKCASE 680GC SERVICE MANUAL 20. This section covers the removal, inspection and assembly of the crankcase seals and crankshaft bearings. 20.1 Remove outer crankshaft seal housing screws and wave washers. 20.2 Remove crankcase bolts. 20.3 Heat the flywheel side crankcase with heat gun for 5 minutes, approximately 150° F (65.5° C). 68 © 2011 ICS- Blount Inc Specifications and pricing are subject to change without notice. P/N 525747 REV12Sep2012