8N 1949 valve guide removal

[Jlpb61]

I am a newbie to this forum and just bought my first 8N tractor. Love it!
Have broken valve spring, bent spring guide, and keepers. The valve guide is stuck and will not come out. Any sugestions?
Also can I buy just those single parts? And where?

 

[Hobo,NC]

Once the valve is out drive the guide down and out the bottom.

Yes you can buy those parts a piece at the time. I have them but don't want to fudge with the shipping its not worth my time... Look over the parts selection HERE first...

If you can not find satisfaction google "nnalert's"

 

[Ninety-two]

To remove the guide you going to have to remove the valve. To do so here we go...remove carb, manifold, air cleaner tube, valve covers, coil and mount, and oil filter so your tractor should look like so.....

your going to need a valve spring compressor or you can make one out of a "C" clamp. Here is mine.

your valves will be slightly recessed in the block.....place a piece of smooth scrap wood over the valve you will be working on. Use the clamp to compress the spring-making sure the fork goes under the plate at the bottom of the spring but allows the valve to pass through the fork. You will see the two small "Half Moon" shaped retaining clips remove those clips.....

Once the retaining clips are removed the valve will pull out straight from the top leaving the bushing, spring and bottom plate.

remove the bottom plate and spring carefully.

now you should be able to see the bushing from the top...put a tall socket in the hole and use a hammer to drive the bushing down.

push the bushing down far enough to expose another "C" retaining clip...remove the clip then finish pushing the bushing down and out.

and your valves and valve assemblies are now removed.


make sure you remember which valve goes where and try to keep the assembly to each valve together. I soaked mine in a solvent. this is how I kept tract of my valves and assemblies.

also in the below the lifters there are several hole big enough to lose the tiny moon clip in......cover those hole to prevent dropping them down there......you can see the hole right above my index finger......which is right below where those clips come off.......

And that's all I got to say about that.....

 

[Big Trees]

(quoted from post at 20:17:34 03/21/16) To remove the guide you going to have to remove the valve. To do so here we go...remove carb, manifold, air cleaner tube, valve covers, coil and mount, and oil filter so your tractor should look like so.....

your going to need a valve spring compressor or you can make one out of a "C" clamp. Here is mine.

your valves will be slightly recessed in the block.....place a piece of smooth scrap wood over the valve you will be working on. Use the clamp to compress the spring-making sure the fork goes under the plate at the bottom of the spring but allows the valve to pass through the fork. You will see the two small "Half Moon" shaped retaining clips remove those clips.....

Once the retaining clips are removed the valve will pull out straight from the top leaving the bushing, spring and bottom plate.

remove the bottom plate and spring carefully.

now you should be able to see the bushing from the top...put a tall socket in the hole and use a hammer to drive the bushing down.

push the bushing down far enough to expose another "C" retaining clip...remove the clip then finish pushing the bushing down and out.

and your valves and valve assemblies are now removed.


make sure you remember which valve goes where and try to keep the assembly to each valve together. I soaked mine in a solvent. this is how I kept tract of my valves and assemblies.

also in the below the lifters there are several hole big enough to lose the tiny moon clip in......cover those hole to prevent dropping them down there......you can see the hole right above my index finger......which is right below where those clips come off.......

And that's all I got to say about that.....

Thanks for this post. I need to do this and your post just gave me a visual. Thank you.

 

[wilber]

Nice job on the how to.

 

[Ninety-two]

You are welcome.

 

[ASEguy]

Nice photo sequence.

 

[Hobo,NC]

Plug those holes up a keeper will find them and hide in the oil pan...

https://photos.yesterdaystractors.c...arameter=hobo,nc&w=pieces&cc=2&s=

Read the comment

 

[ZANE]

None of these is the correct way to remove the valve/valve guides.

The correct and fastest way is to first take the manifold off. reach in the ports with a big long screwdriver that has been ground off of one sied
to make a relief so the guide can be pushed down enough to get the horse shoe keeper off.

Then using a big screwdriver that you don't mind damaging. (I use the same one I made about 50 years ago.

Put the end of the screwdriver up against the bottom of the guide/valve assembly and drive the valve, guide and spring with keeper still attached to
the valve. Then it is easy to take the keeper off the valve and disassemble the valve assembly.

Done it a thousand times and it is much easier and faster.

Zane

 

[Ninety-two]

Zane the way you describe is the way you can do it if the guides will budge.......My valve guides were stuck (wouldn't move) and barely moved with me using the hammer. The original poster said his guides are stuck too (a lot of people have this problem). This is how you get them out in that case.

 

[R Geiger]

To remove the guide and valves, just pry down on guide thru the manifold holes and then remove c clip. remove guide and valve as an assembly. No spring clamp required. I tried the clamp method and then I learned the easy way to do it.

 

[R Geiger]

(quoted from post at 23:12:50 03/22/16) Zane the way you describe is the way you can do it if the guides will budge.......My valve guides were stuck (wouldn't move) and barely moved with me using the hammer. The original poster said his guides are stuck too (a lot of people have this problem). This is how you get them out in that case.

I used lots of PB blaster. But you are right.

 

[Jlpb61]

I have got to say you guys are great. And that first picture looked exactly like my tractor.
I guess.this valve guide is really stuck. I soaked it last night. Later tonight I will hit it again and see if moves. I will let you know how it goes
Thanks everyone

 

[Hobo,NC]

Yes your way works great if the valve guide cooperates...

https://photos.yesterdaystractors.c...arameter=hobo,nc&w=pieces&cc=0&s=

https://photos.yesterdaystractors.c...arameter=hobo,nc&w=pieces&cc=0&s=

If not time is money I don't have the time to wait... I did on a project tractor it took zackly a year of soaking to get the guide to move with a screwdriver...

Either way one needs are it makes life EZ'er to use a bent screwdriver to assy the mess...

 

[Jlpb61]

Yes! It is out. You all gave me great info. Now
1 how do I tell if I need guide seals? I don't see one on it.
2 What is a good solvent to soak these in.
3 I have more than 1 broken spring. I am doing them all. Would you lap the valves?

 

[Jlpb61]

Your photo sequence was what I needed. All valves and guides are out. I ended up with 4 broke springs.
Thank you and everyone else for the help

 

[R.B. Erb]

Ninety Two: How did you get the guide seals to go back in without tearing the new seals on the block?