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Old 08-01-2011, 10:06 PM   #1 (permalink)
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honing tecumseh aluminum block

hi im new here just trying to find out if its possible to hone an aluminum bore tecumseh. or is it better to sleeve it . i have the means to do it either way but my friend who's a automotive rebuilder says you cant hone aluminum bores they will wear out prematurely. but the lawn mower guy down the street says it should work. if i take these engines down this far i want the most longevity i can get, any help would be appreciated thanx scott.
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Old 08-01-2011, 10:13 PM   #2 (permalink)
 
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Hone away its only been done for 50 years on them
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Old 08-03-2011, 12:22 AM   #3 (permalink)
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just go easy, you just want to brake the glaze on the cylinder wall so that the ring will seat. I read that most of the problems come from not cleaning the bore real good after honing. If you leave any grit in there it will act like sand paper on the piston. wash it out with soap and water and plenty of paper towels to get all the grit from the hone out.
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Old 08-03-2011, 08:44 AM   #4 (permalink)
 
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Hone away its only been done for 50 years on them
....so Jeff there is no issue with re-establishing the silicone layer at the top of the honed surface ....like with the old nickasil (sp?) coated cylinders.
I know Sunnen developed a honing process that replaced the old chemical etching process but it's been a while since I messed with that stuff.

I'm guessing the answer is "it's a friggin lawn mower engine just do it "!!!
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Old 08-03-2011, 10:57 AM   #5 (permalink)
 
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Nikasil coated cylinders are more delicate than the iron bores typically used with Flex-Hones. Nikasil is an electroplated oleophilic nickel matrix silicon carbide coating that allows the use of aluminum cylinder walls without a steel sleeve. This coating reduces friction and wear. Great advantages come with the use of Nikasil on coated aluminum blocks or jugs, one of them is the increased heat removal from the piston, pin and ring assemblies. The other advantage is the tighter tolerances can be achieved. Most Nikasil coatings are 0.0003" to 0.0008". To deglaze and freshen up the bore walls you must use an aluminum oxide material based hone. This softer material works well with the hard walls. Use the hone like described above with the exception of much less rotations. Run the hone for 10-12 rotations in the bore and inspect. If the overall cylinder looks touched then you are done and remove the tool.
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Old 08-03-2011, 10:58 AM   #6 (permalink)
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I've honed a bunch of Tec's and never had a problem.
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Old 08-03-2011, 07:25 PM   #7 (permalink)
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thanks for all replys.
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Old 08-03-2011, 07:45 PM   #8 (permalink)
 
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I've honed a bunch of Tec's and never had a problem.

that's because you're special

.....welcome back Nate!
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Old 08-04-2011, 08:24 AM   #9 (permalink)
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Hey guys. Seems like getting the hone in the bore just right would be critical. Is my drill press sufficient for this task? Any recommendations on what hone to get? I had a local Tecumseh tec. look at my cylinder, and he said it was OK. It does not look OK to me though. Thanks.
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Old 08-04-2011, 09:07 AM   #10 (permalink)
 
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aluminum oxide hone, if your means are limited use a ball type.
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