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  #16 (permalink)  
Old 03-02-2012, 09:54 PM
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Quote:
Originally Posted by cobalt327
Many pistons have a mark, notch, arrow, etc. to show "front" of the piston.

In your case, the photo shows how the pistons are installed:



EDIT- The photo above shows a basically stock piston, if you look closely you can see the front orientation on the crown, pointing to the left. The last photo (I removed it and replaced w/this one) I'm unsure of the way the slot was slanting- but it should have been correct anyway.

Unless there are "left bank" and "right bank" pistons, one bank will have the slot on the major thrust side, the other bank will have the slot on the minor thrust side.

So unless there is a pin offset or a relief in the piston crown facing the valves, it really doesn't matter how they're installed, IMO.
C327,
I don't think that is the same piston that he is talking about. The 'slot' is an after-thought that someone is using to relieve the expansion of the piston.

rsfyj,
Have you got a picture of the 'NEW' pistons for your Merc that shows this slot?

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  #17 (permalink)  
Old 03-03-2012, 08:18 AM
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Dont have the replacement

pistons yet. I have small flat head rebuild booklet and the author mentions the slot on the Mercury pistons. But nothing on installation. I am looking at NOS Mercury pistons
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  #18 (permalink)  
Old 03-03-2012, 08:36 AM
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Good luck with your endeavour. Finding NOS 1950 pistons will be a challenge. Aftermarkets, yuppers!
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Old 03-03-2012, 12:56 PM
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photos of the Mercury chambers with that funny knob in front of the spark plug hole

Hers that funny bump in the flat head chambers
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  #20 (permalink)  
Old 03-03-2012, 01:00 PM
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photos

I showed one chamber without the bump for comparison. These are about 3/16 inches high and completely blocks the spark plug that only screws in flush with the combustion chamber.
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Old 03-03-2012, 01:05 PM
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The chambers

that have these bumps are #1, #4, #5,#8 cylinders
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  #22 (permalink)  
Old 03-03-2012, 09:27 PM
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The bump is there so you don't blow out the flame from the spark plugs, much the same as you holding your hand in front of a lamp mantle when your lighting it with a match.
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