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JD A Engine Rebuild

Z

zh4020

New User
Going to rebuild the engine in my 1952 JD A. Where is the best place to get a rebuild kit. Looking for high compression piston, slight bored over. Nothing too crazy. Thanks.
 
Sharpes out of iowa has m&w style pistons up to .125 over . They also have the gasket kit to very nice to deal with. Wwwjd4u.com I think is the web site.
 
Have the cam and followers reground . They are worn.
It will need fresh guides.
Use a rotary cutter like what they use for cutting valve seat inserts. And mill the eyebrow off from around the inlet.
Have a performance 5 angle valve and seat performed.
Match the manifolds to the ports.
Ground the rough edges out of the ports.
If the block cleans up with 45 thou, stop there. There is no measurable difference in power between 45,90 and 125.
Use model 60 LP pistons. Run 91 octane gasoline.
Use a dyno to dial in the timing and mixture.
A "stock" motor " blueprinted" will make a surprising amount of power.
 
I got a oversized piston kit for my styled G from sharps and was happy with it. WOULD NOT recommend getting there gasket kit though. The head gasket on mine was pretty flimsy and I had water flowing out of the petcocks within a few minutes of the engine running.
 
About those eyebrows? I'm in the process of building a LP 60 with a stock head and block. The custom pistons I have ordered will take the comp. ratio to 12.5 to 1. It was recommended to me to open up the eye brows around the valves slightly by milling, which we did, and then measured the CC to arrive at the piston fabrication measurements. My question is if I were to have detonation problems can I completely remove the eyebrows to raise CC measurement? I had planned to install some type of thicker head gasket if I had problems. What do you guys think?
 
I have/had pictures of a sectioned 60 head showing the deck thickness under and around the eyebrows. Take all the eyebrow off and use a set of valve springs from an 80/820/830/840 iirc they fit and are much heavier.
The problem is with the open chamber combustion chamber design. There is no squish or quench area which reduces detonation. Unless the there is some way to make a flat potion of the piston approach within 40 thou of a flat portion of the cylinder head.

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I dont think i would encourage anyone to use fel-pro gaskets (which i think is what they sell) use a genuine john deere gasket.
 
Just a FYI. A "Genuine" John Deere head gasket for an "A" is a Fel-Pro gasket on John Deere cardboard at about 4X the price of the Fel-Pro from an auto parts store. I use the Fel-Pro on my pulling tractors on properly prepared blocks and heads and have never had a problem with leakage or blowing them out.. I do agree that some Fel-Pro gaskets for some other applications aren"t worth hauling home.
 
Do you think I should go ahead an remove eyebrows now before assembly? And will it be a performance advantage? Keep in mind it's LP.
 
We have yet to hear about cam duration. Mechanical compression ratio alone doesn't mean d!ck all . Did the piston manufacture communicate with the cam grinder and have the components match?
Even with LP this would be the time to mill the eyebrows off. The eyebrows were only there on Cyclone heads to add swirl to the mixture to keep the air/fuel mixture mixed. Not required or even wanted with vapour fuel.
As shown on the head cutaway. That other shrouded area around the intake valve should also be cut out to piston bore dia.
This would have been the time to install over size valves too.
 
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