How to change Valve guides In a 4G63T head

[BogusSVO]

How to Change Valve Guides In a 4G63 Cylinder Head
The first thing is to remove the valves, springs, retainers and locks.



The guides are cracked from the bent valves…
(Sorry about the pic,)



The tools needed for this is an air hammer, a regular hammer, venire calipers, and the proper sized guide driver.
Also the replacement valve guides are shown.



Have the head with the deck side up.
With the guide driver in the air hammer, knock out the broken guides.
Take care on not letting the driver get into the head casting.



Once all the guides are removed, flip the head over. Spray lube/oil in the guide bore (not shown), also lube up the replacement guide. Lightly tap the new guide to start it.



Once the guides are started, use the air hammer to get them “close” to where they should be.
I would not recommend trying to hand drive the guide fully into place, damage may occur to the tool, the guide, and/or the head casting.



Once the guides are close, finish set the guides to the proper height. By measuring from the top of the guide to the valve spring pad using the venire calipers.



Once all the guides are set to proper height, The head will move on to the next part of the repair, Having the seats cut, so the valve seat will be index to the center line of the guide.

[Andrew7dg]

That is awesome!

I like learning new stuff!

Is there any more tricks like what valve guides to use?

[scheides]

Good stuff!

[BogusSVO]

Glad you all like these...

as far as guides go .. It depends, you have cast (stock) or bronze (Hi-Po) but the guides do come in .001 and .002 oversize this really needs to be done by someone who understands the press fits of the guide bores so you do not wnd up sucking the guides down

[niterydr]

Just be careful when driving them out as sometimes the head castings can crack/shatter around the guide base. I would recommend some sort of penetrating lubricant to be sprayed around the guide to head contact to avoid this.

[BogusSVO]

also they can gaull up and rip rh alum casting in the bore.

[TkrPerformance]

I made custom tools to do this.
when I put them back in I head up the head and dry ice the guides so they go in nice and easy with the tool I made to hold the guide in the right spot

[BogusSVO]

thats a good way to do it tooo