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Conference vmszoo::rc

Title:Welcome To The Radio Control Conference
Notice:dir's in 11, who's who in 4, sales in 6, auctions 19
Moderator:VMSSG::FRIEDRICHS
Created:Tue Jan 13 1987
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1706
Total number of notes:27193

783.0. "Little arrow on the piston" by TARKIN::HARTWELL (Dave Hartwell) Wed Nov 30 1988 12:13

    I pulled apart my engine to clean it and attempt to repair the
    crack in the case..... I also failed to determine which way the
    arrow was pointing that resides on the top of the piston. I
    assume that the arrow should point to the exhaust port but I've
    been wrong before..... It's an OS .40 SF
    
    
    
    						Dave
T.RTitleUserPersonal
Name		DateLines
783.1Did you check the price of a new case?CURIE::ANKERAnker Berg-SonneWed Nov 30 1988 12:4121
        Re:< Note 783.0 by TARKIN::HARTWELL "Dave Hartwell" >

        Dave,
        
                Have you  checked  how  much  a  new  case will cost.  My
        experience is that  engine parts are usually extremely reasonably
        priced.
        
                If you need it,  I'll  pull  the  head  on my .40 and see
        where the arrow points.
        
                      _ 
                     / |
        |  _====____/==|
        |-/____________|
        |    |        o \
             O           \ 
                          O
         Hang in there! o_|_
                          |
             Anker      \_|_/
783.2Arrow probably forward but .....STRINE::CHADDGo Fast; Turn LeftWed Nov 30 1988 20:3427
Dave,

Don't worry about the arrow, you have many ways to see which way the piston 
fits.

	1. It the rod has not been removed from the piston the bezel on one 
	   side of the big end goes towards the crank.

		| |
		| |
	       -   -
Back Plate     |   /  <--- bezel
 this side     |---|
	       |---|
	       |   \
	       -----

	2. The side of the exhaust port is always the hottest and the piston is 
	   blackened or stained more than the Transfer port side.

	3. There is a cutout in the piston for the transfer port. Often if the 
	   piston is the wrong way the exhaust port exposes the bottom of the 
	   cutout. This will cause

One of the above should put you on the right track.

John.
783.3YesLEDS::ZAYASFri Dec 02 1988 20:202
    
    	In my .40 FSRs, the arrow does point to the exhaust ports.