Hello, I tried to search this with no luck. I hope someone can answer this for me. As I was installing my new rings on the pistons. It is a 5 ring piston by the way, I noticed that the 4th ring from the top (oil ring) is different from the ones on the old pistons. The new one is not a solid cast ring but a squigily one with a thin ring on top and bottom of it. Kinda what you would see on a small block chevy. But the kit was listed 5th 4th 3rd and so on. All the other rings are the same except the 4th ring. Has anyone seen this before?
A3.135 piston question
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The kid
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Is this your piston? - kid
murphy1244
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That's a oil control ring.
I have flat top pistons. But the ring positions are the same. I have the vertical injectors.
The kid
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Curt, I'll scan that page and sent it to you in a private message in few minutes. -robert
TomSeller
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Right, the direct injection AD3. engines had the dished piston top.
Unfortunately I am just now finding out more about one of my AD3.152's pistons than I ever expected to know. It drew at least part of #1 liner into the crankcase. Made kind of a mess. Part of the liner ended up being crunched (pulverized) at the head.
The kid
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Ok.. Let's try this again. Click on the picture and then click it again to expand. -kid
View attachment 306393
View attachment 306393
The kid
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Thanks, The Manual I have says its a spring loaded laminated scraper ring. Thats fine, but I need to find out if this "new ring" can be used to replace the original. This whole rebuild is due to piston failure after a rebuild. I will try to post a pic of the old and new tomorrow and see what you all think. I bought this project due to excessive oil consumption. Turns out the lands between the rings were all busted up. I just want to be sure that this scraper ring is correct.
I just used the exact setup you described on my AD4 203 which is almost the same engine you have with one more cylinder. The oil control ring that you described is fine to use in my opinion. 1 of my four pistons had the "newer style" setup already because previous owner had it repaired some time ago and was fine until rod bearing failure and it was not the hole that had been repaired.
I'd be interested in more detail about this issue. Was it recently rebuild, original or somewhere in between?
TomSeller
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I will post more in a few days once I get my facts together. Previous owner had it "professionally rebuilt" and my guess is the liners were wrong. The liners on #2 and #3 did not rise above the block and pushed out almost by hand. I just saw your post in another thread and I think I inherited the problem you might have had. I am guessing the liners were "working" (slipping) In use and fatigued. Good catch on your part. I will post pictures in a few days.
Whoever previously rebuilt the engine probably didn't gap the rings correctly. Alternatively, the sleeves they used may have been the wrong ones.
These are the same type of rings I used when rebuilding my Continental Z145 gasoline engine.
WilliamBos
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Semi finished sleeves finished in the block are the best way to go. Finish hone the cylinder to perfection, nothing out of round. We did that to the lat Peru we rebuilt, did not add to much extra cost to the overhaul.
TomSeller
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I will post a new thread with pictures so it is referenced under an AD3.152. I had the taller lip but the liners had to be the wrong ones or were manufactured wrong, they slide back in the block by hand. The previous owner said the rebuild was done professionally, but I am questioning that of course. Liner #2 broke off just below the lip after removal, so it had fatigued and was ready to fail. Liner #3 appears to be undamaged but it would have failed as well eventually.
don45640
Gold Member
FYI , the types of rings are interchangeable for car engines I have rebuilt......dunno about your specific instance,but my guess is they are okay. don-ohio 
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The kid
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There was so,some else here that had sleeves that where too tall and come to find out they gave home the wrong ones. He did get it worked out though.
