Question On 21 Stud Engine

P

plumber99

Member
Hi, The galley plug behind the cam gear that I removed had a spring on it. Is there supposed the be a plunger on the end of the spring? Also, the engine had the org 3 ring pistons, is there any advantage to running a 4 ring aluminum piston? Thanks, Bill
 
All early engines that I have seen, had a plunger also.
No, there is no advantage to a 4 ring piston. More weight & friction
 
There is a spring with a little plunger attached on the oil relief valve in the top/front area of the lifter valley. This plunger is spherical on one end with two or three little flat spot that allow a slight amount of oil to flow into the timing gear area. Never saw a spring on the galley plug behind the timing gear. This original front galley plug is a special plug with a small extra extension/projection in front of the threads.

There have been many previous debates here regarding 3 vs. 4 ring pistons. The last one I recall got so ugly that it may have been deleted. I believe most of these debates lean towards using 3 ring pistons instead of 4 ring. Less friction loss.
 
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Agree, no piston advantage. I don't recall if the plunger was a ball or something else on my 21-studder. Your's is probably still in there or maybe it came out, fell on the floor, never to be seen again. 8^)

Jack E/NJ

Edit: After seeing John's response, I now don't recall seeing a spring either. The plug did have the small extension John mentioned --- maybe to fit inside a spring that stayed in my block out of sight. I didn't actually peek inside to see if there was a spring in there. Maybe mine came out and rolled on the floor never to be seen again. 8^O. I wonder if I should be worried?
 
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John>>>There have been many previous debates here regarding 3 vs. 4 ring pistons. The last one I recall got so ugly that it may have been deleted.>>>

To keep my mind off of whether or not I should be worried about not seeing a galley plug spring, I'd much rather have a heated debate about 2 vs 3 ring pistons --- even less friction with maybe only a bit more oil usage and a bit less compression. 8^)

Jack E/NJ
 
Bill, tilt your head to the left. The 8^) sign looks like a smiling face. All the "Smilies" are written like that. Most come out as a smilie, but some don't. For instance, this "; )" should show as a winky smiley thus: ;) (I had to put a space between the ; and the ) to stop it showing as the smiley.

Mart.
 
Bill W>>>You use the 8^ sigh offten ????? What is the meaning of that ????? >>>

o u c now du u? Geez, Bill. I was trying to incite a riot over 2 v 3 ring pistons. And you went and spoiled it. I only use 8^) when I'm wearing glasses. Otherwise, I don't. :^)

Jack E/NJ
 
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