12 replies to this topic

[foggy]

Hi all.just a quick one...can anyone tell me if you can just press out valve guides and press a new set in? I am talking about both sets being steel

[Sir Yun]

in short.

yes.

and it is cast iron not steel by the way

[freshairmini]

http://www.theminifo...g-valve-guides/

BOOM! This thread pretty much covers the answer.

[foggy]

Thanks guys...although it is steel valve guides you can buy...didnt realise tge standard guides cast iron

Edited by foggy, 28 November 2012 - 09:11 AM.

[Cooperman]

Just off to the workshop to press in a new set in a 940 head shortly. Waiting for it to warm up in there a bit first.

[Carlos W]

Just off to the workshop to press in a new set in a 940 head shortly. Waiting for it to warm up in there a bit first.

Do you want to do mine?

[Cooperman]

It took me about 15 minutes to press the new ones in and set them to the right height. The old ones were out already as it is a head I've been doing some gas-flowing on. Just got to get the seats cut, the valves lapped in, combustion chambers measured and head skimmed for ideal compression ratio.

[Scoop77]

What ratio will you be taking it up to?

[Cooperman]

It's not for me so I need the owner to tell me what he wants it to be. I shall advise between 10:1 & 10.2:1 but it's his decision.

[dklawson]

Do you have your own press or did/do you hammer them in with a suitable drift?

[Cooperman]

I always use my large vice to press them in. Works fine so long as you dont put them in too far.
To get the old ones out I have a 1/4" bolt with the head ground circular so that it is slightly less than the OD of the guide, then I punch the guides out using the bolt as a mandrel.

[dklawson]

I was curious about how you were pressing them. I replaced the guides on my 2-L Triumph engine last year. I have a WW-II era milling machine and I used its knee to press the guides in and out. It would have been smarter and easier if I had taken the head to work and used the hydraulic press.

For what it's worth at this point, to control the insertion depth I made a stop collar that went around the outside diameter of the guide. That prevented me from pressing the guides in too far. I am sure you could do the same for an A-series head.

[Cooperman]

I put no.1 guide in first, then no.8. When they are exactly right I fit the others in turn using a straight edge between 1 & 8 to ensure that all go in the correct amount, +/- about 0.005". It's always worked OK.