neat way to remove valve guides - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 39 (permalink) Old 10-01-2012, 06:34 PM
Richard Jemison
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I`m Not grumpy

Nor am I hiding behind a fake name on the BB. If you have issues with my post. Just ignore them. Or better yet understand that the numb-nuts posting stupid things need to be addressed as such.

We have a large group of them here on the BB. Great fun pointing them out!!! And they do include some of the "moderators"

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post #17 of 39 (permalink) Old 10-01-2012, 07:05 PM
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Well said JR !
I think that you should be a moderator. Then things would be quite civil around here !

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post #18 of 39 (permalink) Old 10-02-2012, 09:31 AM
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Also should point out that this is a violation of forum rules, and the mods will swing Mjolnir if required to maintain peace and order

Although I do appreciate that a lot of folks on the BB make me feel very young and mellow in comparison
I don't approve of this dialog.. Please stop or I'm going to stop posting and take my pills. PS I never use icons..those are for people who don't know how to make a meaning to their words. HL Menken nor WC Fields nor Will Rogers nor Don Rickles needed them . Unfortunately none of them owned Alfas....Just get over it.
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post #19 of 39 (permalink) Old 10-02-2012, 12:54 PM
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I hope you do too!

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post #20 of 39 (permalink) Old 10-02-2012, 01:19 PM
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post #21 of 39 (permalink) Old 10-12-2012, 07:00 PM
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See what happens when the Sheriff throws his weight around? Clanton boys get really testy.....



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post #22 of 39 (permalink) Old 10-13-2012, 08:23 AM
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flower thingie

The little flower thing is something the BB puts there and seems to relate to instant messaging. I don't know what or why. If you go to "edit your details" in the user CP, it appears under the available selections for instant messaging.


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dperterson3.. what is that flower thing in your header...?

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post #23 of 39 (permalink) Old 10-13-2012, 11:50 AM
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I clicked on it and it sent me to ICQ which I think is an acronym for I Seek You and maybe also a take off on the radio telegraphy code for "general call" which was CQ. ICQ is an IM service.

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post #24 of 39 (permalink) Old 10-16-2012, 10:13 AM
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Lots to read in this thread, on the surface and between the lines. Very helpful.

For someone who is likely to do this rarely, the experienced heads prevail. Personal experience in my (unrelated) field of work has taught me that there are ways of doing things, and then there are best practices. Sometimes a neat trick is worth a try - but when dealing with things that can be unrecoverably screwed up, the latter is always the best choice. Best not to succumb to short cuts, or, uh, take the bait.

Jeff - In coastal Alabama with one Alfa that runs.....
and only two more gathering parts.
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post #25 of 39 (permalink) Old 10-18-2012, 12:49 PM
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I had never heard of Bianchi's method but trying to be impartial I looked up Rex Hutchison racing. They have been in business for 40 years so they are doing something right however looking at their website they mostly work on American iron.
A Chevy 350 is not an Alfa and my personal experience is these type of machine shops are not usually best for us. How many Alfas have they done?
I'll stick with the tried and true method Richard described.

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post #26 of 39 (permalink) Old 10-19-2012, 11:27 AM
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I will chime in here. I have heard of this method before. used on airplane aluminum heads. but heating the head is to be used at the same time.

There are a few important things with this method.

1. The threads are cut on the combustions side (dirty side)
2. The thread should not go that far or past where the guide goes into the head
3. The guide is moved out from the clean side (Cam side) to the dirty side

So if the threads expand the guide it does not matter as that part is all ready out of the head. and will never go past the head.

And heat the head in a oven before you do it. And a bit of freez spray on the guide as you drive it out will not hurt.

But if you think this out there is no way pounding on the end no mater what the shape is better then pulling. and this method is a pulling not a pushing method.

If there is any elasticity to the guide the pounding will make it fatter while the pulling will make it skinnier.

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post #27 of 39 (permalink) Old 10-19-2012, 11:52 AM
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As Rj brought up "Broach" and this is about valve guide.
I think I should say what is normally meant by Broach.
I think RJ was thinking if the thread went all the way and is a different context then what is the normal guide Broach. and this could confuse some one reading

So here is what is normally meant by broaching a guide.

There is a crappy practice of remanufacturing of heads where instead of replacing the guides they "Broach" them. common on the heads with the short 90day warrantys.

They run what looks like a tap but it does not cut it just pushes the metal in a spiral.
Then hone to spec the valve will run like a new guide as it will be tight. but the valve is riding on the tiny ridges of the spiral. and lets say there is a reason for the 90 day warranty.

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post #28 of 39 (permalink) Old 10-19-2012, 12:48 PM
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The term for repairing valve guides, usually exclusive to cast heads with integral valve guides, is called knurling ('adding' metal), not broaching (removing metal). The two are completely different processes.

Jim

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post #29 of 39 (permalink) Old 10-19-2012, 02:05 PM
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Quote:
Originally Posted by papajam View Post
The term for repairing valve guides, usually exclusive to cast heads with integral valve guides, is called knurling ('adding' metal), not broaching (removing metal). The two are completely different processes.
Yes, I believe RJ was implying that it would remove metal from the head where the guide is located as it was pulled out.

Removing valve guides is a rare thing for the home mechanic so the tried and true method is the way to go ... my point being saving 10 minutes of clock time is not important.
Pete

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post #30 of 39 (permalink) Old 10-19-2012, 03:53 PM
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My memory might be fuzzy but I remember reading a ad for the set and I would have swear it was called a valve guide broaching. but knurling would make more sense. but it is still not adding but just grooving. a normal example of knurling would be the grip part of a jack handle. normally made with a wheel pushed into the rotating steel from a lath or NC mill the wheel has the pattern, looks kinda like a flint wheel off a lighter.

I think of a normal broach as the things used to make a keyway. so when used in odd ways I get confused I guess

As for the tap method it is not a time saver but a head saver and I think that method had been around a long time so it is a tried and true method.
but a normal shop, time is $ and just a quick pound out is faster.
I saw this tap method used on rare fragile air plane heads. the other method was to bore the guides paper thin and collapse them but that had other risks.
So it is not just the one place that does it like that.
and I think I have also seen that method in a car OEM shop manual too just can't remember which one.

The one thing I have noticed over the years anything to do with machinery have been done. maybe forgotten but done before.
So many times I see something as a brand new then see a 100 year old example latter.


Then there is the term more then one way to skin a cat.
there are a lot of ways to do some things none of them wrong.
and the fastest/cheapest way will become the norm but it might not be the best way but not wrong ether.

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