naa piston Zanes Adjustment Jig

I have the top cover off. Followed his directions and I am sure everything will work well. One question on the lift cylinder. I had to hone it out due to some minor scoring and was wondering if there is there a max clearance allowed between the cylinder wall and the NAA piston?

Also, I would guess the backup ring is installed toward the hollow end of the new piston. If wrong please correct me.

While I have this mess apart, are there any items I may as well replace while I have the lift cover, pump, and pto removed?

Thanks guys !!!

It matters not which way that leather ring is turned. Rough side or smooth side. It matters whether or not you break it trying to install it though. Soak it in water over night or boil it in water for a few minutes if you are in a hurry to get it back together as I always am. I put mine in something like a jar lid etc with a bit of water and heat it with a torch.

No it doesn"t work every time! Nearly every time! :O)

Be sure to replace all three cylinder to lift housing gaskets. The two small round ones and the three hole one. If the gasket material is not the same material or age it will cause the cylinder to sit unevenly on the housing and blow the gasket. Do not use any sort of glue on the gaskets. Glue may tend to allow the gasket to slip under pressure and blow out.

Good luck, Zane

That particular project was the most trying and difficult job I have undertaken in restoring my 8N. However, most of the problem was due to a lack of knowledge on my part.

(Whoever said what you don’t know won’t hurt you is mistaken)

HTH. Rick

Dean

The leather backup washer dies go to the dogbone side o fthe piston.. and the rough side to the oring.. smooth side to the metal grove face.

Soundguy

not sure what a dogbone is.....unless you are talking about that ram arm thing that gets jammed into the hollow end of the piston

I would say the backup washer should be toward the hollow side..... furthest from the intake stream..... correct?

thanks!! you are a wealth of information

And yes.. the flat washer has a smooth and rough side.

Soundguy

Soundguy

I would assume the O ring is a bit more forgiving.

I've heard some even clean with brake cleaner then dab jb weld in the bad scratches, when wipe out leaving the jbweld filing the scratch with good results..

Soundguy