TM 10-3930-660-34 3-8. CRANKSHAFT - REPLACE/REPAIR (Cont’d) b. Remove and discard thrust bearing (18) from number 6 main bearing location in the block. DISASSEMBLY 1.   REMOVE WEAR SLEEVES (19 AND 20) IF INSTALLED OR NECESSARY. a. Remove and discard front wear sleeve (19) and rear wear sleeve (20) from crankshaft (14). 2.   REMOVE CRANKSHAFT GEAR (21). Use a suitable gear puller to remove crankshaft gear (21) and roll pin (22), if necessary, from crankshaft (14). CLEANING 1.   SEE CLEANING INSTRUCTIONS, PARA.  2-10. CAUTION If crankshaft is not to be reinstalled within one hour after it is cleaned, apply lubricating oil on the bearing journals. Failure to comply with this recommendation will result in bearing journal corrosion. 3-55