Changing Clone Head Valve Guides

[JP54]

Are there any tips or tricks to pressing old valve guides out and pressing in new ones in clone heads? I have a hydraulic press and was considering using a mandrel that pilots inside the guide and presses on the face of the guide. Was planning to heat the head. Planning to do a valve job after installation.

 

[Kart43]

They press out easily I made a mandrel, and used a small hand arbour press.

 

[Big Chris]

Yeah like Kart43 said, pretty straight forward. In fact, you don't even need heat. They are a light interference fit. Just double check the protruded length into the port for tech reasons.

I do this often, whenever I port a head I press the valve guides out of the way first.

 

[WinstonSmith]

Big drill press works too.
I use a bolt and push.

You don't need heat, but it hep with removal ( warm up in an oven at 400F ).
Heat and cold makes putting the new ones in a lot easy.

Dry ice is handy.
No heat required at all

 

[JP54]

Thank you for the responses!

 

[DynoDon]

Be aware that you will need a reamer to cut for clearance and a seat cutter to true up the face.

 

[fzyrrx]

What size Reamer to clean up the stem hole do you use Don? The hole closed when I pushed the guide down ...thanks (0.216 or 5.5 mm? ). Will buy what you recommend thanks

 

[DynoDon]

Let me check my reamer tomorrow. I will give you an answer

 

[Kart43]

The one I use is 5.52 .217"

 

[DynoDon]

I actually do three steps but I finish with a .216

 

[fzyrrx]

Thanks for the responses

 

[WinstonSmith]

If you are porting and just want to push the guide out of the way a bit you won't need to ream.
But when you push it back you will find you need to touch up your seats because things do shift just a bit and that is enough to make the difference between good valve seat contact and not....