the sucker king Posted September 6, 2014 Share Posted September 6, 2014 (edited) Can anybody recommend specific tools for honing the cylinders in ea71 and ea81 engines? I see tools on ebay run from $10 to $150. What do I need to do this, I've got a ea81 block to rebuild with minor corrosion in one cylinder. Edited September 7, 2014 by the sucker king Link to comment Share on other sites More sharing options...
Crazyeights Posted September 7, 2014 Share Posted September 7, 2014 (edited) Can anybody recommend specific tools for honing the cylinders in ea71 and ea81 engines? I see tools on ebay run from $10 to $150. What do I need to do this, I've got a ea81 block to rebuild with minor corrosion in one cylinder. Sorry, wrong place... Edited September 7, 2014 by Crazyeights Link to comment Share on other sites More sharing options...
Uncle Ed Posted September 7, 2014 Share Posted September 7, 2014 Cylinder hone, a Ridge reamer to remove the ridge that may be at the top of the cylinder, and a piston ring compressor. Though I'd recomend that you have the cylinders checked to see if they are out of round. Ed Link to comment Share on other sites More sharing options...
silverhelme Posted September 7, 2014 Share Posted September 7, 2014 Very seldom will you need a ridge reamer and I use a brush hone rather than a standard hone, it gives a better finish in the cylinders. You will need a ring compressor though. Link to comment Share on other sites More sharing options...
Subruise Posted September 7, 2014 Share Posted September 7, 2014 i used a strapwrench for piston rings. On ea series engines ive yet to need a hone or reamer of any kind. maybe a scotchbrite wipe down but when the crosshatching looks new after a quarter million miles....I wouldnt worry Link to comment Share on other sites More sharing options...
the sucker king Posted September 24, 2014 Author Share Posted September 24, 2014 the wire wheel type tools for this are the ones I am looking at. ea81 cylinders are about 3.5" in diameter. Do you buy a 3.5" tool? I would think you would want it a little oversized? Also I see them in 240 and 320 grit. So what tool to get? here is a link to the style of tool I am looking at: http://www.ebay.com/itm/FLEX-HONE-TOOL-GB31224-Flexible-Cylinder-Hone-Bore-Dia-3-1-2in-240-Grit-/221544692867?pt=LH_DefaultDomain_0&hash=item339517bc83 Link to comment Share on other sites More sharing options...
the sucker king Posted September 24, 2014 Author Share Posted September 24, 2014 okay I did some more research, 3 3/4" is the correct size, now the only question is what grit, I found these from 120 to 400 grit, I have one cylinder with some corrosion, how course do I need to remove rust and what grit should be used to finish it? Please anyone with personal experience let me know. Link to comment Share on other sites More sharing options...
the sucker king Posted September 26, 2014 Author Share Posted September 26, 2014 (edited) Alrighty I ordered up a 120 grit for the rust and a 240 grit for the finish. I found this online, anyone know what our subaru cylinder sleeves and piston rings are made of? Edited September 26, 2014 by the sucker king Link to comment Share on other sites More sharing options...
El Presidente Posted September 28, 2014 Share Posted September 28, 2014 Are you planning on honing the cylinders and reusing your old rings? Josh Link to comment Share on other sites More sharing options...
Ibreakstuff Posted September 28, 2014 Share Posted September 28, 2014 NPR recommends 220-280 grit and 45 degree crosshatching, so the 240 grit should do it. You did get silicon carbide correct, GB33424? Link to comment Share on other sites More sharing options...
the sucker king Posted September 29, 2014 Author Share Posted September 29, 2014 Are you planning on honing the cylinders and reusing your old rings? Josh No why do you ask? NPR recommends 220-280 grit and 45 degree crosshatching, so the 240 grit should do it. You did get silicon carbide correct, GB33424? Yes that is correct, thanks! Link to comment Share on other sites More sharing options...
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