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NotTaR of small Gasoline Engines and Rotary Lawn Mowers : Crankshaft anatomy                      
 Copyright © 1994-2007, Samuel M. Goldwasser. All Rights Reserved. Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: 1. This notice is included in its entirety at the beginning. 2. There is no charge except to cover the costs of copying. I may be contacted via the Sci.Electronics.Repair FAQ (www.repairfaq.org) Email Links Page.

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Crankshaft anatomy

The diagram below shows the major parts of the crankshaft:


                           Counterbalance weights
                                __   |   __
                               |  |  |  |  |
       Threads for             |  |<-+->|  |           Threads for
       Flywheel nut            |  |     |  |           blade adapter nut
             |                 |  |     |  |  __              |
             V     _________---|  |     |  |-|__|_______      V
            ...---/         |  |  |     |  | |__|       ----+...
            |||   |         |  |  |     |  | |__|       |   ||||
            '''---\_________|  |  |     |  | |__|_______----+'''  
                         ^  ---|  |_____|  |-|__|  ^          
                         |     |--|     |--|  ^    |
                Main bearing   |  |     |  |  |   Main bearing
               (Flywheel end)  |  |_____|  |  |  (PTO/blade end)
                               |__|  ^  |__|  |
                                     |        +--- Crank gear (meshes
                                                   with cam gear)
                                 Crank pin
                                  Journal


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