06-25-2017, 05:09 PM | #1 |
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Join Date: Sep 2015
Location: western n.c.
Posts: 393
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valve question
i bought a used engine a while back that runs but could use a little help. the mains and rods are tight but the rings are worn. i can't get into an expensive overhaul right now and plan to go with new rings. hone the cylinders and would like to lap the valves if that is possible.
1. i assume those two piece guides go out the botttom toward the tappet chamber, is that correct? 2.i am thinking of buying the tool that the vendors sell, but am unsure how it works. do you put it around the valve stem and tap down on the valve to remove the guides? 3.if i go through this process to clean the valves , are they going to be centered in the seat? on modern engines you install the guide then grind the seat so everything is centered. 4. is there a better way to improve the seats without removing the guides? i might be able to hand lap the valves a bit without removing the guides, but seems like real tedious work. |
06-26-2017, 12:13 AM | #2 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: valve question
Any picture of the seats?
If they look good, I'd leave them alone. If they need to be ground, then buy the tool that fits under the valve head, and you use a hammer and blunt punch to tap the guides down, and you must tap exactly in the center of the valve. Of course the keepers and springs must be removed first. |
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06-26-2017, 08:56 AM | #3 |
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Join Date: Dec 2011
Location: SW Idaho
Posts: 970
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Re: valve question
You need to remove the pistons. Then use an inside micrometer and measure the taper. A machine shop can do that for you. If there is a ridge at the top of the bore that makes it difficult to remove the pistons, then stop and go to the machine shop. He will remove the ridge, then measure the taper for you. Only then will you know if honeing the cylinder and re-ringing is an option. By far, the recomendation is to have the engine out and on a stand, if for nothing else, to remove rust at the rear of the block. Take some chances out of necessity, at the same time don't waste money on something that wont work.
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06-26-2017, 09:59 AM | #4 | |
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Join Date: May 2010
Location: NC
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Re: valve question
Quote:
A better way is just grind the valves and seats. that would be a lot faster and a much better job. |
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06-26-2017, 02:03 PM | #5 |
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Join Date: Dec 2010
Location: FRESNO, CA
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Re: valve question
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