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Topic Review (Newest First)
03-03-2012 09:27 PM
alittle1 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.
03-03-2012 01:05 PM
rsfyj
The chambers

that have these bumps are #1, #4, #5,#8 cylinders
03-03-2012 01:00 PM
rsfyj
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.
03-03-2012 12:56 PM
rsfyj
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
03-03-2012 08:36 AM
alittle1 Good luck with your endeavour. Finding NOS 1950 pistons will be a challenge. Aftermarkets, yuppers!
03-03-2012 08:18 AM
rsfyj
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
03-02-2012 09:54 PM
alittle1
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?
03-02-2012 06:41 PM
rsfyj
The reason

I was concerned about the orientation of each piston and the slot. 2 pistons on each side had a burn hole through to the top ring. The only other odd thing I found was in the chambers of the head, on each head I found a square bump in the chamber casting right in front of the spark plug hole on the thrust side in all 4 pistons. Is it possible the bump impeded the flame travel and over the miles it burned a hole through all the pistons where the chamber had these bumps. The other 4 chambers did not have these bumps.
03-02-2012 06:29 PM
rsfyj
Good Thanks

Now I wont have to worry when i put others back
03-02-2012 04:55 PM
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.
03-02-2012 04:53 PM
rsfyj
Quote:
Originally Posted by krooser
As you know the oil squirt holes should face inward... I have never seen expansion slots like that... must be an aftermarket piston?
>>true about the oil hole but you can pin these pistons either way my engine had 2 going one way and 2 going the other way. i think a shade tree mechanic did the engine at one time. After Ford sold it
03-02-2012 04:50 PM
rsfyj
Nope

Standard Mercury pistons because on the increased stroke Ford original
03-02-2012 04:41 PM
krooser As you know the oil squirt holes should face inward... I have never seen expansion slots like that... must be an aftermarket piston?
03-02-2012 07:58 AM
rsfyj
1950 mercury

pistons with the slots on them
03-02-2012 07:53 AM
rsfyj
1950 Mercury

Hers some photos of the slots in the Mecury pistons 2 of them were on the thrust side with numbers on the rods facing out. And the other 2 were facing the intake side with the numbers on the rods facing out.
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