neat way to remove valve guides - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 39 (permalink) Old 10-20-2012, 07:07 PM
FWIW, I've used Bianchi's method on several heads and had no trouble With damage to the head. Visually the bores look fine and there is no evidence of damage on the OD of the guide.

I must admit, I did not measure the bore diameter but the new guides only go in after heating the head, freezing the guides and a bit of persuasion (using the Jim K. tool).

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post #32 of 39 (permalink) Old 10-21-2012, 09:31 AM
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Shankle used to offer a valve guide that was slightly knurled to replace guides that had gauled the guide bore. I have always just taken the correct valve guide removal tool and driven the guides out. Never had to us a over-sized or knurled guide. Knurling a new guide is not a big deal if you need it. Practically any automotive machine shop can do it or if you have a lath - easy. Always heat the head before driving new guides. Your oven works well here if your wife is not home.
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post #33 of 39 (permalink) Old 10-21-2012, 06:49 PM
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My engine builder back in the days when I used to race cars always used to make valve guides with a little step (flange?) on them so they could not drop. Yes this meant he machined up his own and wasted a lot of bronze (material assumed, not sure what they were made out of) but I like the idea.

These sorts of guides were used on my Sud race engine ... I think he machined the head(s) so the little step would go in a recese in the head so as not to upset the valve spring steel washer.
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post #34 of 39 (permalink) Old 10-21-2012, 08:48 PM
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knurling doesn't add metal, it displaces metal leaving grooves and ridges, decreasing the inner diameter which can then be reamed to size.
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post #35 of 39 (permalink) Old 10-21-2012, 09:39 PM
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Quote:
Originally Posted by 86spider View Post
knurling doesn't add metal, it displaces metal leaving grooves and ridges, decreasing the inner diameter which can then be reamed to size.
Correct, but I believe "little_italian" was referring to knurling the outside of the valve guide, not the inside.

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post #36 of 39 (permalink) Old 10-22-2012, 05:26 AM
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Originally Posted by Little Italian View Post
Shankle used to offer a valve guide that was slightly knurled to replace guides that had gauled the guide bore. I have always just taken the correct valve guide removal tool and driven the guides out. Never had to us a over-sized or knurled guide. Knurling a new guide is not a big deal if you need it. Practically any automotive machine shop can do it or if you have a lath - easy. Always heat the head before driving new guides. Your oven works well here if your wife is not home.
Knurling the outside must be just a temporary fix.
It's generally agreed that the valve dissipates 25% of it's heat through the guide and if the whole guide is not in contact with the head that would affect heat transfer.
Why not just rebore the guide bore and install the proper oversize (OD) guide?

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post #37 of 39 (permalink) Old 10-22-2012, 03:32 PM
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Correct, but I believe "little_italian" was referring to knurling the outside of the valve guide, not the inside.

Pete
True, but I was responding to post 28 referring to knurling adding metal.

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post #38 of 39 (permalink) Old 10-22-2012, 04:06 PM
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Note that the word added is in quotes. Just as RJs broach is in quotes. I though it may be easier for some to understand that knurling decreases the ID of the guide by "adding" metal rather than describe the actual process.

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post #39 of 39 (permalink) Old 10-22-2012, 05:16 PM
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So it should be told in a sarcasm tone "adding" with fingers in the air like a certain ex pez ""I'm not a crook" heheh

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