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05-19-2024, 09:09 PM | #1 |
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valve guide question
I am trying to install modern guides in my 30 engine, the block bores are a little larger on some guide bores (thumbs push on one ) and .0007 interference on others, What would be an easy way to tighten them?
I am thinking mabe a light knurl if possible on the o.d and then using some sort of locking compound or tossing them out in the rain and letting them rust a little, what would be a good locking compound , I know there is usually a locktite product for every occasion , but which one do I use , I realize there will be a lot of heat involved and I don't want them to work loose, I cant find any oversize guides . any suggestions would be appreciated. thanks, Fordestes |
05-19-2024, 10:48 PM | #2 |
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Re: valve guide question
Use a valve guide knurling tool, it looks like a tube cutter with the cutter wheel replaced with a knurling wheel. Check with Goodson Tools.
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05-20-2024, 06:11 AM | #3 |
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Re: valve guide question
The vendors sell guides that are a slip fit and held in by the valve spring. See https://www.snydersantiqueauto.com/c...s/A-6505-M.pdf
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
05-20-2024, 11:00 AM | #4 | |
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Re: valve guide question
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05-20-2024, 11:07 AM | #5 |
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Re: valve guide question
so you are saying knurlize the guide bores? I am thinking about maybe a light knurl on the guides , I guess I'll just knurl the O.D of the guides and use some J.B.Weld, I don't care to use glue to put an engine together but I guess it will have to do, I am concerned about getting everything on center. thanks!
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05-20-2024, 11:25 AM | #6 |
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Re: valve guide question
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
05-20-2024, 04:34 PM | #7 | |
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Re: valve guide question
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05-20-2024, 05:01 PM | #8 |
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Re: valve guide question
That is what I said , The guides are some hard stuff I just found out , I have since been able to reach someone who will hard chrome the O.D of the guides ,so mabe that way I can adjust to get a snug fit, I think a thumbs push is a little too loose for me, I am thinking about .002 interference should be ok. what do you think for interference fit. in the old days on some of the overhead engines we could buy oversized guides and sometimes tapered guides were called for, but those days are long gone. thanks for your input.
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05-20-2024, 09:08 PM | #9 |
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Re: valve guide question
Well, you could make a guide out steel and put a bronze liner in it. Still, why not knurl the outside of the guide you have and drive it in! Knurling expands the diameter.
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05-20-2024, 11:02 PM | #10 | |
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Re: valve guide question
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05-21-2024, 01:21 AM | #11 |
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Re: valve guide question
Its probably a cast iron guide. You can knurl the outside to tighten them up.
Works great. It may seem hard but they knurl easily. |
05-21-2024, 11:29 AM | #12 | |
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Re: valve guide question
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05-21-2024, 11:30 AM | #13 |
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Re: valve guide question
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05-21-2024, 12:04 PM | #14 |
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Re: valve guide question
I did what you are contemplating one time on a friend's engine, a year or so later I again opened that engine for a different reason and found that one guide had slipped down nearly a full inch. The slip-ins are the best, they are like the originals but are one-piece.
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05-21-2024, 02:44 PM | #15 |
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Re: valve guide question
Press-in guides may cause frustration because of the following:
1) The fit of press-in valve guides can vary from loose to tight 2) Press-in guides may become loose over time 3) Press-in valve guides put the cylinder block into tension and may cause a crack (Grey iron tensile strength is very weak compared to compressive strength) 4) Press-in valve guides don't have the .125 inch shoulder and the valve spring tension is less 5) A .125 inch washer is needed with press-in valve guides to restore valve spring tension 6) Some press-in valve guides are too long which makes valve spring installation very hard The non-frustration alternate is one-piece slip-in valve guides with the shoulder |
05-21-2024, 07:06 PM | #16 | |
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Re: valve guide question
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05-21-2024, 08:06 PM | #17 |
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Re: valve guide question
I'm dealing with this issue now myself with my BURTZ block. The modern valve kit sold by all the suppliers part number 6505M the valve guides are too small. Even knurling did not produce acceptable fit. My machine shop is going to procure some bronze guides and fit them into the block.
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05-22-2024, 12:59 PM | #18 |
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Re: valve guide question
The slip-in guides are not a press fit and the fit should result in no detectable wobble when fully installed in the cylinder block.
If the guides wobble when installed, they are too loose. The cylinder block dimensions are guaranteed to be correct per our warranty. |
05-22-2024, 01:42 PM | #19 |
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Re: valve guide question
This is the kit that the guides have an interference fit.
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