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Home > How To > How to change valve guides

alpa

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Grenoble, France

12th Jan, 2010 at 05:20:10pm

Hi,
I'm sure having seen a discussion here about changing the guides in a kitchen oven. But can not find it again.
So the question is: how to proceed to remove and to insert new guides ?
In this old discussion a person was claiming there was no need to bore the guides after a hot installation, while it's necessary when they are inserted cold (this is what happened to me).
Thanks

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

Tom Fenton
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Rotherham South Yorkshire

12th Jan, 2010 at 05:36:08pm

Press them out, press them in, ream to size, thats it.


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alpa

520 Posts
Member #: 2093
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Grenoble, France

12th Jan, 2010 at 05:37:42pm

To press I need a press, right ? I don't have a press.
It must be possible to do that by heating the head, isn't it ?

Edited by alpa on 12th Jan, 2010.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

Paul S

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8604 Posts
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Formerly Axel

Podland

12th Jan, 2010 at 05:43:17pm

I just use a hammer.

Make a watsit out of a 1/4" bolt by rounding of the hex.

Put watsit in guide and hit with a drift and a big hammer.

Put new ones in the same way and then ream out. It may be easier if you heat the head first.

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alpa

520 Posts
Member #: 2093
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Grenoble, France

12th Jan, 2010 at 07:57:37pm

Thanks, I'll try. I'm short of money, so I need cheap solutions :) .

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

Advantage

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Near Paris - France

12th Jan, 2010 at 10:21:25pm

You're back in France, by the way ?

Rusty by nature

On 23rd Jun, 2008 paul wiginton said:
They said "That sounds rough mate." I said "Cheers it cost me a fortune to make it sound like that!"


alpa

520 Posts
Member #: 2093
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Grenoble, France

12th Jan, 2010 at 11:43:26pm

Yes I came back this summer. And I'm going to install my stage 2 dev: 295 head, 1bar boost and all the rest to make that work.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

Vegard

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7763 Posts
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I pick holes in everything..

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Norway

13th Jan, 2010 at 08:45:20am



On 12th Jan, 2010 Tom Fenton said:
Press them out, press them in, ream to size, thats it.


You'll need to have the seats recut after this though...

I use a hammer to remove them, but I wouldn't hammer new bronze guides in. The reason is that they get so deformed at the top making it loads more work to ream/file the top of the guide. Also it's much easier to set them to the correct height with a press.
Punching the port-part of a bronze guide is a definite no-no!

Edited by Vegard on 13th Jan, 2010.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.
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