mcbrat Posted September 27, 2005 Share Posted September 27, 2005 the twisted sleeves.... cylinders 1 and 3 of a ea81 block... you can just barely see the access hole for the wrist pin on the left side of the sleeve cut-out... http://www.ultimatesubaru.org/photos/showphoto.php?photo=8142&sort=1&cat=530&page=1 and this is the other cylinder, where you can really see it better... http://www.ultimatesubaru.org/photos/showphoto.php?photo=8141&sort=1&size=medium&cat=530&page=1 this was a block I tore apart after it got a rod knock... the rod bearing was totally gone!!! Quote Link to comment Share on other sites More sharing options...
Snowman Posted September 27, 2005 Share Posted September 27, 2005 WTF!? How the heck can that happen!? Quote Link to comment Share on other sites More sharing options...
Subi81 Posted September 27, 2005 Share Posted September 27, 2005 That is exactly what I want to know. The pressures on that iron sleave have to be sooooo great. The aluminum around it literaly is trying to crush the sleaves how did it rotate? Does the earth revolve around your cylinder sleave? Quote Link to comment Share on other sites More sharing options...
stephenw22 Posted September 27, 2005 Share Posted September 27, 2005 From Wikipedia The coefficient of linear expansion for aluminum is 23x10^-6 m/C The coefficient for iron is 12x10^-6 m/C When it gets really hot, the aluminum will expand more than the cast iron sleeve, and it could get loose. That's likely how they got it in there in the first place. Why did the bearing fail? Did it overheat? That would be the first clue as to what caused the sleeves to rotate. Quote Link to comment Share on other sites More sharing options...
archemitis Posted September 27, 2005 Share Posted September 27, 2005 i guess they are a heated pressed fit, with green locktite. everything wears out over time... even subarus nice one mcbrat, i've never been able to blow up an na subaru. Quote Link to comment Share on other sites More sharing options...
mcbrat Posted September 27, 2005 Author Share Posted September 27, 2005 i guess they are a heated pressed fit, with green locktite.everything wears out over time... even subarus nice one mcbrat, i've never been able to blow up an na subaru. well, wasn't actually me. this came out of a '83 Brat I bought and parted. only had 86k on it.... I heard it run briefly, but with a bad exhaust leak. it had gas tank issues, so I had it towed home then stripped it, so I never heard it run again until I put the motor into the 87 wagon I used to have, then had to pull it back out because of the knock. Quote Link to comment Share on other sites More sharing options...
subarunuts Posted September 27, 2005 Share Posted September 27, 2005 I blew up an 84 EA81 - I'm convinced that what does it is a combination of bad oil pressure, and insufficient cooling. The rod bearings go if the oil pump's aren't replaced about every 100k - 200k it seems. Depends on maintenance of course, but after 200k, I've not seen an oil pump that can hit decent pressure - even after a reseal. The 84 developed a rod knock, and shot the rod through the top of the engine... unfortunately it had a digi-dash, and once the oil pressure was low enough to light the idiot light (started flickering at idle), the damage was already done. I resealed the pump and the light went out, but about 5k miles later the rod went at about 170k. In my case the problem was made worse by flooding the engine with muddy water on several occasions, and then driving home before changing the oil. I am 100% sure that had I simply replaced the oil pump when I got the car at 145k, and possibly the radiator as well, it would still be going. Quote Link to comment Share on other sites More sharing options...
nipper Posted September 27, 2005 Share Posted September 27, 2005 Thats an engine that was really overheated. I wouldn't trust that block for anything but a coffee table. It still happens from time to time on the newer soobys toonipper Quote Link to comment Share on other sites More sharing options...
ccrinc Posted September 28, 2005 Share Posted September 28, 2005 We see a few of those. Needless to say, they become scrap metal immediately. Not even good enough for a coffee table, IMHO. Emily http://www.ccrengines.com Quote Link to comment Share on other sites More sharing options...
nipper Posted September 28, 2005 Share Posted September 28, 2005 maybe a cup holder and lamp? hehehe nipper Quote Link to comment Share on other sites More sharing options...
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