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Ford 9N, 2N & 8N Discussion Forum
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naa piston Zanes Adjustment Jig

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usedcarsalesman

08-15-2005 06:39:08




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Got Zanes jig and have just been able to get around to pulling the 8N apart.

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 !!!

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ZANE

08-16-2005 05:46:01




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 Re: naa piston Zanes Adjustment Jig in reply to usedcarsalesman, 08-15-2005 06:39:08  
There is no relationship between the piston to cylinder wall clearance for a steel ringed piston to the NAA piston. You can stand a lot more clearance with the NAA piston and the Neoprene rubber ring with back up washer.

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

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Rob

08-15-2005 10:23:49




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 Re: naa piston Zanes Adjustment Jig in reply to usedcarsalesman, 08-15-2005 06:39:08  
Clearance of piston in ram cyliner should not exceed 0.0025 inch.



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Rick H. Ga.

08-15-2005 09:39:56




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 Re: naa piston Zanes Adjustment Jig in reply to usedcarsalesman, 08-15-2005 06:39:08  
I would say to go ahead and replace the rock shaft bushings while you have the lift cover off the tractor, but, since I busted my lift cover trying to get the rock shaft and old bushings out...had to buy another lift cover (thanks Don B.)...and in the end, gained about an1/8 to 3/16 of an inch less play between the shaft and bushings, I will say just leave the bushings be unless they are worn completely through to the lift cover.

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 donít know wonít hurt you is mistaken)

HTH. Rick

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Dean

08-15-2005 07:36:55




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 Re: naa piston Zanes Adjustment Jig in reply to usedcarsalesman, 08-15-2005 06:39:08  
Replace the cam follower pin (or turn it 180 degrees) while you have the lift cover off and before making adjustments.

Dean



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souNdguy

08-15-2005 06:54:58




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 Re: naa piston Zanes Adjustment Jig in reply to usedcarsalesman, 08-15-2005 06:39:08  
Yes there is a max tolerance in the book. i honed mine out at least to that tolerance.. and I can hold / lift 750 # on the lift for hours.. easilly. That fat oring is very forgiving for less than perfect bores.. just make sur ethe rough edges are gone.

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

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usedcarsalesman

08-15-2005 07:07:20




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 Re: naa piston Zanes Adjustment Jig in reply to souNdguy, 08-15-2005 06:54:58  

so the flat washer has two sides to it?

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



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souNdguy

08-15-2005 07:10:13




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 Re: naa piston Zanes Adjustment Jig in reply to usedcarsalesman, 08-15-2005 07:07:20  
Assuming you have this apart.. or have the manual.. you will know that the closed end of the piston goes toward the pressure.. and the open end of the piston couples to the dogbone, and the lift arms.

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

Soundguy



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usedcarsalesman

08-15-2005 07:12:33




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 Re: naa piston Zanes Adjustment Jig in reply to souNdguy, 08-15-2005 07:10:13  

thanks.....didnt know it had a smooth and rough side as I didnt see it in the IT service manual.



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souNdguy

08-15-2005 12:17:18




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 Re: naa piston Zanes Adjustment Jig in reply to usedcarsalesman, 08-15-2005 07:12:33  
I&T service manual may or may not even list the New NAA piston and rubber oring/leater backup washer.. I'd suspect it would still list the 3 ring piston.

Soundguy



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usedcarsalesman

08-15-2005 12:24:29




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 Re: naa piston Zanes Adjustment Jig in reply to souNdguy, 08-15-2005 12:17:18  
and here is the thing,,,,,i know the specs for the piston and lift cylinder for a three ringed 8N piston is .00025 clearance ....is there a wider tolerance for the naa piston and oring setup? I have to hone the cylinder a bit as there are some scratches in the cylinder after 55 years of abuse.

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



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souNdguy

08-15-2005 12:35:14




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 Re: naa piston Zanes Adjustment Jig in reply to usedcarsalesman, 08-15-2005 12:24:29  
i honed mine out of clearance for a 3-ring piston, and as I said.. I am having 0 problems with leaks.

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



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usedcarsalesman

08-15-2005 06:51:42




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 Re: naa piston Zanes Adjustment Jig in reply to usedcarsalesman, 08-15-2005 06:39:08  
also, found about an inch of whiteish crud coating the bottom of the pump plate and in the PTO shaft hole. 55 years of crud all flushed away now...hopefully it works like new when it is reinstalled.



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