Piston install questions
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
The package I have illustrates a half dozen different chamfers, notches, etc. Some go up, some go down. Just wanted to make sure you were aware of this. Putting an engine together is pretty easy, but the details need to be paid attention to.
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Cargo Master
Joined: May 2011
Posts: 2,388
Likes: 138
From: Northern California
Thanks for being so persistent with this. I missed something.
The order is fine.
The top groove has no dot or bevel. These are fine.
Sorry these pics arent the best. Camera didnt want to zoom on the ring.
The middle ring has a bevel and a dot. I over looked this assuming it was the same as the top.
Since I only installed half I inspected the rest. Half were off. Damn now I have to pull them all.
The order is fine.
The top groove has no dot or bevel. These are fine.
Sorry these pics arent the best. Camera didnt want to zoom on the ring.
The middle ring has a bevel and a dot. I over looked this assuming it was the same as the top.
Since I only installed half I inspected the rest. Half were off. Damn now I have to pull them all.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I think it's for the compression pressure that makes it's way down to that ring to add additional force to press the ring against the walls harder than it would without it. It was that chamfer I could see in your previous pics that put me onto making sure you get them installed correctly. You also should check the end gaps too, to insure the gap is wide enough to prevent it from closing completely when the ring heats up. A ring gap closing allows the ends to butt together putting stress on the ring. I am guilty though of not always doing this. But so far I don't think I've ever had anything bad happen if the gaps did close.
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