2 valve head disassembly

[akmnstr]

I need to have a valve job done and to save money the shop I'm working with suggests that I break down the heads completely.  So I have the cams, shims, and valves out.  But how do I get out the shafts for the rocker arms?  I have a haynes manual but their instructions seem as clear as mud to me.  They indicate that I need a special tool to remove the closer arm to take care of the spring.  Is there a way to work around that.  And I'm not seeing how to remove the opener shaft.  I can get a 5mm bolt into the shaft but I am not able to get the shaft out.  Does it thread out or is it pulled out? 

[Speeddog]

Jury rig a slide hammer on that 5mm bolt to pull 'em out.
It doesn't have to be a big one, a moderate sized socket is enough for a slider.

You'll have to sorta hold the closer rocker down to get the spring pressure off of the shaft so you can slide it out.

You'll have fun getting the closer rockers back in with the spring. 

[He Man]

Just a question...if youre capable of removing the heads of your block, why cant you just do your own valves?

[uclabiker06]

Just a question...if youre capable of removing the heads of your block, why cant you just do your own valves?

+1...Good question.

[akmnstr]

Just a question...if youre capable of removing the heads of your block, why cant you just do your own valves?

I could lap the valves in with valve grinding compound but I have either a bad valve or a bad seat.  I don't have the equipment or knowledge to do the valves or seats grinding.  I may also need some new guides.  I could drive the old ones out but I would still need to machine them to fit the valves.  I am just a fool that shouldn't be doing any of this but I dig having grease under my fingernails. 

Thanks to speed dog.  While I was waiting for a reply I was able to get 2 intake shafts out but 2 are stuck.  I'll try the slide hammer method. 

[He Man]

hell in that case, i would take the heads off too. lol good luck man.

[akmnstr]

At last complete success.  All the rocker arms and shafts are out.  Putting it all back together should be an adventure particularly the closer rocker arms, and springs. 

I improvised a puller by purchasing several different size 5mm bolts and a couple of large diameter washers with 5mm holes.  I threaded the bolts into the shafts with a socket and a washers functioning as a spacer.  I then tightened the bolts which pulled out the shafts.  The washer kept the head of the bolt from being drawn inside the socket.  By switching combinations of bolts and different depth sockets I was able to keep the shafts coming.  A slide hammer would have worked more quickly, but for some reason some of the shafts were hard to remove.   

[Speeddog]

Sometimes the shafts spin in the heads and get galled a bit. 

They really shouldn't, but I think they do it just out of spite. 

[Desmo Demon]

You'll have fun getting the closer rockers back in with the spring. 

+1.....what's even more fun is doing it with the heads still on the engine and the engine still in the bike. I replaced all the valve guide seals on my '87 Paso with the engine still in the frame. My thumbs and fingers were sore for a week......For 2V engines, there is a closer rocker tool that is around $50. I believe it will hold the spring and rocker together so that you can just slide it into the head and then install the rocker shaft.....I'll look up the part number.....

In my ST2 parts manual, it shows the tool as #88713.0143. From what I remember from when I was looking into maybe buying one, it is for all 2V engines. I decided to not buy one and toughed it out.

[akmnstr]

+1.....what's even more fun is doing it with the heads still on the engine and the engine still in the bike. I replaced all the valve guide seals on my '87 Paso with the engine still in the frame. My thumbs and fingers were sore for a week......For 2V engines, there is a closer rocker tool that is around $50. I believe it will hold the spring and rocker together so that you can just slide it into the head and then install the rocker shaft.....I'll look up the part number.....

In my ST2 parts manual, it shows the tool as #88713.0143. From what I remember from when I was looking into maybe buying one, it is for all 2V engines. I decided to not buy one and toughed it out.

I've seen a photo of the tool.  It is not a very complicated thing.  $50, ouch!  Will this job be any easier with two people (four hands) working on it?

[Desmo Demon]

Will this job be any easier with two people (four hands) working on it?

Not really. On my Paso, as probably with the other 2V engines, there are possibly thrust washers (shims) to take the free play out of the closing rocker. You barely have enough room to get your own hands in there. I did get my wife to help me twice to push the rocker shaft into position while I slid the rockers and shims in place. If you put a thin coating of grease on the shim, if there are multiple shims on one side, the grease will hold them together and prevent them from falling out. I also used a magnegtic screwdriver to help hold the shims into place. There was one rocker that took me over 45 minutes to get in place between dropping the shims and the soreness in my fingers.

Here is the head with the valve cover removed (note that the early Pantah engines did not have that neat little clip to allow simply sliding the rocker over to change an openign shim.....the opening rocker and shaft needs to be removed!)....



Here is a shot with the opening rocker removed...



*Note - I did not remove the cams to change the valve seal guides when I did this, but I also think it would not have helped.


Here is a shot of the really thin shim (0.01 mm, I think) that my wife put the rocker shaft through while "gently" tapping the shaft into place...

[akmnstr]

Ugh :oThat does not look good!

It sounds like this job will involve some