TIP: Click on subject to list as thread! ANSI
echo: oldcars
to: ELVIS HARGROVE
from: TOM HARRIS
date: 1996-11-28 16:13:00
subject: Wrist Pins

 On 11-27-96 Elvis Hargrove wrote to Tom Harris... 
 
 EH> 
 EH> Look at it this way... pivoting in the piston you have TWO rather 
 EH> large 
 EH> bearing surfaces to absorb the load versus ONE limited surface in the 
 EH> rod end. 
 
Been doing some research on wrist pins, looked 
through Fords Service Bulletins and found these 
 
             ******************* 
  Wrist pins are assembled in the pistons with 
a metal to metal fit. When properly selected 
the pin can be pushed into the piston with a 
slight pressure of the hand. 
             *********************** 
Wrist pins are selected to give a clearance of 
.0005' in the connecting rod. 
             ********************* 
  The upper end of the connecting rod has 
.040 total side play between the wrist pin 
bosses in the piston. 
             ********************* 
  The lower end of the connecting rod has 
.008' to .012' end play on the crankshaft, 
              ********************** 
  When fitting a wrist pin in piston, select a 
pin which cannot be pressed into the piston by 
hand at room temperature. Next submerge 
the piston in boiling watcr, allowing the 
piston to remain in the water from one to two 
minutes, then withdraw piston, wipe out pis- 
ton pin holes with a clean cloth and insert 
pin. If properly selected the pin can then be 
pushed into the piston with a slight pressure 
of the hand. Taking the chill out of the pin 
by holding it in your hand for a few seconds 
and then applying a light film of oil on the 
pin will make it easy to install. 
 
    When I get this car restored I want to 
drive it from Austin Texas to the top of 
Pikes Peak and back, thats one reason I 
want it done right. 
 
Tom 
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