X hits on this document

PDF document

    - page 6 / 13

36 views

0 shares

0 downloads

0 comments

6 / 13

(1 8

 

4

%

  

 



















 

  • % 

 

 





'



 

 

  • 

    %

  • %

  • $

  • 

    %

  • %

 

  • %"



  • '





%"

(2      %     %"     %   

(6  

  • 

    %       

*7 3  "#









# % 

*

!



    

  • &  9  

    



  • %

  •   

    #

   

  •     

    &

  •  

    "

#

  • 

    '



   



%

'

 

  •  

    % &

  • &&

'



 

   

flanged so that the crankshaft end float is limited through the front main bearing between this flange and a steel ring attached to the aluminum-alloy cam oil transfer bracket bolted to the diaphragm. Studded to the main crankcase is a cast magnesium-alloy section which mounts the valve tappet assembly and in which a fourth main bearing is supported by a diaphragm. This intermediate casting, together with the main crankcase, forms a housing for the valve gear. See Fig. 9.

Unfortunately, the complete crankcase front section which had housed the reduction gear is not available for inspection. This nose section had been of conventional structure as shown in the front view of the engine.

CRANKSHAFT — The engine crankshaft is a three-piece steel shaft mounted on four main bearings as just mentioned. Fig. 10 shows crankshaft parts. Crankpins are 3 in. in diameter by 3-3/8 in. between cheek faces. The installation of the one-piece master rod is accomplished by splitting the shaft near the center of the crankpin. Crankpin diameters and abutting surfaces are carburized to Rockwell C 60 to a depth of 0.044 in. Core hardness is Rockwell C 44. A splined joint typical of certain American practice is used. Thirty-six involute splines with approximately 2.3 in. OD are used for location. The male splines in each case are on the forward half of the split and form a tight fit with the female splines on the rear half. The entire joint is held

;

 

 &



 

 

$ 

#  

'

 4 

  • !  

Document info
Document views36
Page views36
Page last viewedMon Dec 05 08:59:58 UTC 2016
Pages13
Paragraphs941
Words8379

Comments