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valve repairs


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#1 thom OFFLINE  

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Posted December 29, 2015 - 11:57 PM

I would like to hear how you guys and gals clean small engine valves, with the valves out of the engine. I chuck the valve in my drill and hold the face, or sealing edge, against a piece of adhesive backed sandpaper stuck to my workbench, trying to hold the drill and valve at the proper angle. I have also put the valve in my drill-press and held a file or sandpaper against the valve. What works for you? Thanks.



#2 Tecumseh power OFFLINE  

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Posted December 30, 2015 - 12:27 AM

I can answer for you the best I can. I build cylinder heads for caterpillar this is what I do every day.I wouldn't do that you are better off lapping them. Your drill chuck doesn't run true enough. The ex valve for example is cut at 46 degrees and the seat at 45 so they intersect and seal. If you get it a few degrees off it will never seal. You can't hold one or two degrees by hand and you can't tell by your eye a few degrees. Valves really shouldn't be lapped but it is alot better than doing that . I lap them at home it works well

Edited by Gary yz, December 30, 2015 - 12:38 AM.

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#3 Tecumseh power OFFLINE  

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Posted December 30, 2015 - 12:27 AM

You have a good chance of ruining the valve that way
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#4 WNYTractorTinkerer ONLINE  

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Posted December 30, 2015 - 01:15 AM

Most I do is wire wheel the carbon off and lap them back in with compound.  


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#5 Alc ONLINE  

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Posted December 30, 2015 - 06:17 AM

 

Most I do is wire wheel the carbon off and lap them back in with compound.

That's the same for me too . I've never tried your sanding block method but I guess if the valve isn't too bad , then I would still lap them to make sure I didn't wreck them  


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#6 boyscout862 ONLINE  

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Posted December 30, 2015 - 07:52 AM

I have used the wirebrush and lapping for years but recently acquired an old Souix valve grinder. I will learn to use it better this winter. I saved a bunch of blown engines as practice examples for the valve grinder and boring bar. Good Luck, Rick


Edited by boyscout862, December 30, 2015 - 07:53 AM.

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#7 glgrumpy OFFLINE  

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Posted December 30, 2015 - 10:12 AM

Power wire brush in your grinding head.  I like fine ones. I clean most everything in bolts and small parts that way. Clean off the oils first! Chip away any big carbon, then use the brush. Hang on tight, wheel can grab if you are not paying attention. Then lap them in your block, re-clean in solvents, assemble. Course if the thing has pieces burnt out or heads angled and such things, a new one is needed.


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#8 Marty'70 ONLINE  

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Posted December 30, 2015 - 04:43 PM

[quote name="Gary yz" post="637939" timestamp="1451453227"]I can answer for you the best I can. I build cylinder heads for caterpillar

Which one do you work for?

#9 framesteer OFFLINE  

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Posted December 30, 2015 - 07:31 PM

I'm also lucky, having both a NuWay valve seat surfacer and an old (but still serviceable) valve grinder.  I touch the valve seats just enough to remove all the old surface and get a nice clean seat.  I take as little as possible when grinding the valves, just enough to remove the old seat grooves.  Removing too much material will encourage the valves to warp.  Then I lap them with fine compound.  Have had good success so far.






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