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Old 07-19-2021, 06:30 PM
Sculldog1 Sculldog1 is offline
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A valve grinding tool for #4 exhaust?

7 of 8 valves and seats lapped and ready to go back in! However, the #4 exhaust valve was badly pitted and I ordered new one. Question is is there a tool or grinding stone I might be able to use to create an acceptable surface on the seat as it is pretty rough? I will be lapping the new valve into the seat but thought that if I could use another tool to do some of the initial work it might go faster and give a better result.
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Old 07-19-2021, 06:54 PM
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Surcouf Surcouf is online now
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I would say the old valve: might be pitted and not re-usable, but should be a good "lapping tool"
A nostalgic PO - Previously "Almost There" - Catalina 27 (1979)
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Old 07-19-2021, 07:28 PM
Sculldog1 Sculldog1 is offline
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I did try that but the top was quite badly pitted and the suction cup thing wouldn't stick to it making it ineffective. I was beat from lapping the first 7 valves and called it quits at that point. I may try to tack weld a bolt to the valve so I can chuck it into cordless drill and have at it that way. I did see 45* grinding stone but not sure if this would damage seat to the point of ruining it and forcing me to pull the motor. Would need .3145 mandrel I suppose but not sure if it is prudent considering I am trying to avoid engine take out and haul out. Any thoughts from machinist types appreciated. Thanks
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Old 07-21-2021, 12:02 AM
Dave Neptune Dave Neptune is online now
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Valve seat "cutters" are available easy to use and usually available for rent. I have used them of many engines.

Dave Neptune
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Old 07-25-2021, 06:47 PM
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Al Schober Al Schober is offline
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Using a valve as a lapping tool is OK, but it's not going to remove much metal. You really need something more aggressive, such as the stone in the photo.

Last engine I did, I had the shop do the valves and seats. Intake seats weren't too bad and ground in. The exhaust seats were shot and the shop installed carbide inserts - no extra charge.

I like Goodson for engine tools!
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